Basic of maya

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Basic of maya

  1. 1. Basic Material TypesLambertLambert is a flat material type that yields a smooth look without specular highlights. It calculates withouttaking into account surface or reflectivity, which gives a matte, chalk-like appearance. Lambert material isideal for surfaces that dont have highlights: pottery, chalk, matte paint, and so forth. By default, any newlycreated object is assigned the Lambert shader.PhongThe Phong material takes into account specular reflectivity to create highlights across an object surface. Thealgorithm can be customized for surfaces such as plastic, porcelain, and glazed ceramic.PhongEPhongE is a faster rendering version of Phong that yields somewhat softer highlights than Phong.BlinnThe Blinn material calculates highlights on surfaces similarly to Phong; however, Blinn can achieve a moreaccurate representation of the soft tinted highlights you see on metallic surfaces. Because Blinn is a versatilematerial type and doesnt cause flickering with bump maps.AnisotropicThe Anisotropic material type stretches highlights and rotates them based on the viewers position.Anisotropic materials are ideal for materials such as hair, feathers, brushed metal, and satin.Ramp ShaderThe Ramp Shader material consists of built-in ramp graphs to offer more advanced control and simplify theshader network.Ocean ShaderThe Ocean Shader material has several items in the shaders attributes that control how the materialbehaves over time, and it has graphs to add detail to the base shader. Attributes include Wave Speed, WaveHeight, Wave Turbulence, and Wave Peaking.Layered ShaderThe Layered Shader lets you combine several materials to create a more complex material.Shading MapThe Shading Map material is primarily designed to let you get a "cel" look in 3D, like typical animatedcartoons.Surface Shader
  2. 2. The Surface Shader is used when you want to control a materials color, transparency, and glow withsomething else in Maya.Use BackgroundThe Use Background shader cuts a "hole" in the images alpha channel where objects with the materialappear. This material is useful for combining separately rendered images in a compositing program to createthe final results.Material SettingsTo edit material settings, double-click on any material in Hypershades top or bottom tabs. Usually, youcreate a Blinn material in the Work Area of the bottom tab panel, and then double-click it to edit it in theAttribute Editor.
  3. 3. Fig 5_2 Material settings in the attribute editorNotice the material name at the top of the Attribute Editor, which Maya sets to blinn1 for a default startingname. Maya increments the number if you create more Blinn materials. Next is the Common MaterialAttributes section, followed by the Specular Shading section. These two sections, displayed by default, areused the most in material editing.ColorThe default material color.TransparencyIf the transparency value is 0(black),the surface is totally opaque; if the transparency value is 1(white),thesurface is totally transparent. If you change transparency from the default black ,the background of thematerials hypershade swatch becomes a checked pattern .This is not a visual aid and is not rendered.Ambient ColorUses Black by default. As the ambient color becomes lighter, it affects the materials color by lightening itand blending the two colors.IncandescenceThe color and the brightness of light that a material appears to be emitting. The default color value is 0.Bump MappingMakes the surface appear more rough or bumpy by altering surface normals according to the intensity of thepixels in the bump map texture. A bump map does not actually alter the surface.DiffuseGives the material ability to reflect light in all directions. The diffuse value acts like a scaling factor appliedto the color setting-the higher the diffuse value, the closer the actual surface is to the color setting.TranslucenceGives the material the ability to transmit and diffuse light. Light falling on a translucent surface is firstabsorbed beneath the surface and then diffused in all directions. The slider range is 0 to 1.Surface Material AttributesSpecular colorThe color of shiny highlights on the surface. A black specular color produces no surface highlights. Thedefault color value is 0.5.ReflectivityGives the surface the ability to reflect its surroundings or the reflected color. The default color value is 0.5.
  4. 4. Reflected colorRepresents the color of light reflected from the material. This can be used to tint a reflection.Surface Material Fig 5-3 Surface MaterialsAnisotropicRepresents surfaces with grooves, such as cd or feathers etc. Anisotropic material (such as Phong orBlinn)reflects specular light identically in all directions.If you spin an isotropic sphere, its specular highlightremains still.RoughnessDetermines the overall roughness of the surface. The range is 0.01 to 1.0.The default is 0.7.Smaller valuescorrespond to smoother surfaces and the specular highlights are more concentrated.Fresnel IndexA fresnel is a flat lens consisting of a number of concentric rings that reduces spherical abnormalities. TheFresnel index for water is 1.33.Value range from 1.0 to 20.0.Anisotropic ReflectivityIf on, Maya automatically calculates Reflectivity as a fraction of roughness. Reflectivity is on by default.
  5. 5. Blinn AttributesColor The base color of the surface.Transparency Adjusts the surface opacity. You can use colors to create a tinted glass effect.Ambient Color Adds to and blends with the color value.Incandescence A simulation of emitted light. At low values, it tints and self-illuminates the material, and athigh values, it overtakes the materials color and becomes self-illuminated.Diffuse By default, its set to 0.8, which dulls down the color value youve set.Translucence A special effect in which light is absorbed and scattered as it passes through an object, usefulfor simulating materials such as frosted glass.Translucence Focus Controls how light scatters from the surface.Eccentricity The width of the highlight, simulating how polished or rough the surface appears.Specular Roll Off The brightness/intensity of the highlight.Specular Color The color of the highlight; usually set to white or a gray value.Reflectivity The strength of reflections on the object. Reflections can be raytraced or use texture maps.Reflected Color For Blinn, the color swatch and slider have no effect. However, when a texture map isapplied, it appears to be reflected by the material.LambertRepresents matte surface(such as chalk,matte paint,unpolished surfaces) with no specular highlights. Theinitial shading group uses a lambert material.Layered Shader AttributesRepresents a single surface material composed of several different surface materials layered on top of oneanother.TransparencyBy default the material is semi-transparent.Compositing FlagComposites the layers using a layered shader or layered texture mode.Hardware colorHelps you distinguish the objects assigned to a layered shader in the views.Phong Attributes
  6. 6. Represents glassy or glossy surfaces with a hard specular highlight.Cosine powerThis feature is available to the phong material. Controls the size of shiny highlights on the surface. Thedefault value is 20.Phong E AttributesA simpler version of the phong material. The specular highlights on the Phong E surfaces are softer thanthose on Phong Surfaces and Phong E surfaces render faster than Phong surfaces.RoughnessControls the specularity focus.Highlight SizeControls the amount of specular highlight.WhitenessControls the specular highlight color. The default value is white. You can also map a texture to this value.Shading Map AttributesRepresents a color map you apply to surfaces after they are rendered.The shading map material is useful forcreating non-photorealistic effects(cartoon shading)or to highlight threshold values in a rendered image.Shading Map ColorDefines the color of the material. The default is gray.ShaderYou can map any material to the shading Map material.Surfaces Shader AttributesA wrapper node, meaning you can connect any keyable attribute to this shading group and then connect theshading group to an object.Out colorThe color of the material .The default is black.Out TransparencyThe transparency of the material. The default is black.
  7. 7. Out Glow ColorThe glow color of the material. The default is black, without glow.Use BackgroundYou use it to set the objects Matte channel to 1 or 0, or create a matte for shadows and reflections on thesurface. This material applies the same color as the objects in the background image to stand -in-surfaces.AttributesAdjust the Use Background materials to the light ,shadows, reflections and the geometry placement in thescene.Texture MappingNormally, a texture refers to applying a 2D image around a 3D surface, rather like wallpapering a curvysurface. Because a 2D image can be stretched, wrapped, and projected onto a surface in many differentways.Mapping CoordinatesMapping coordinates, also known as UV coordinates. For NURBS, parametric mapping is inherent to thesurface and this is typically whats used. Parametric mapping is the 0 to 1 coordinate system that NURBSuses to map textures across its surfaces. It makes sure that the textures stay mapped to the surface like adecal, even if the geometry is deformed.For polygon surfaces, mapping is normally applied by projecting 2D maps across the 3D surface in one ofseveral ways: planar, cylindrical, spherical, and a special method called automatic mapping. Fig 5-4 Mapping projectionProcedural Maps
  8. 8. In addition to applying an image or movie to a surface, Maya has other texture types called proceduraltextures. Many patterns, such as bricks, tiles, and gradients, are so repetitive that they can easily berepresented by an equation. By using special forms of seemingly random values, many natural effects canbe simulated mathematically: Marble, leather, water, granite, and many other complex and random texturesare included with Maya as procedurals.Mayas procedural textures come in two varieties: 2D and 3D. You can think of the 2D procedurals as acalculated form of a bitmap.When 3D procedurals are applied, however, they exist throughout 3D space,and object surfaces define where you see the texture. Its like carving the object from a block of thematerial.Procedural textures have several benefits. Because they are formula based, their parameters canbe adjusted to instantly synthesize all kinds of different effects.2D ProceduralsMayas 2D procedurals can be divided into two categories: regular patterns and noise patterns. The regularpatterns include Grid, Checker, Bulge, Cloth, and Ramp. With these patterns, you can create tiles, bricks,and many other man-made repeating effects. Noise patterns include Fractal, Mountain, Noise, and Water.These psuedorandom textures are excellent for creating the complex "dirty" surfaces common in nature.3D ProceduralsAll the 3D procedurals but snow are random types. Some, such as wood and marble, clearly imitate nature.However, all are excellent for synthesizing random effects.Assigning material to surfacesThe following lists a few quick ways to assign a material to a surface. In the view,select the surface to which you want to assign the material. From Hypershade, MMB-drag the material swatch over the selected surfaces. or In the view ,shift-select the object to which you want to assign the material and in hypershade,click the material swatch. While the cursor is over the material swatch in hypershade,RMB -click-drag to select assign material to selection from the pop-up menu. or MMB-drag and drop a Hypershade swatch onto an object in the IPR Render view.To apply a material to several surfaces from with Hypershade Select the surfaces in a view. In Hypershade,RMB-click over the material swatch and select Assign material to selection from the pop-up menu.To apply a material to a group of faces on a polygonal surface Select the surface.
  9. 9. Press the RMB while over the surface,select face from the marking menu,then choose the select bycomponent type icon.Select the face you want to map.While the faces are highlighted in the view, in hypershade,LMB-shift-click over the material swatchyou want and press theRMB and select Assign material to selection from the pop-up menu.MAYA Tutorial -Cameras and Lighting Page 1 of 3 When Maya starts, you have four cameras by default: front, side, top and perspective. Three of them are orthographic—flat, non-perspective views—and have visible icons you can use to translate or rotate the camera. The icon for the perspective camera is, by default, invisible. These four cameras are utility views that assist you in modeling and laying out your scene. When youre ready to pick the final rendered viewpoint of your scene, you should create a scene camera. If youre shooting a series of stills, you can create many cameras, one for each shot. The camera placement determines exactly what will be seen and is used to frame specific portions of the scene, in the same way illustrators or photographers use composition to frame certain elements in their paintings and drawings. Other key variables for cameras are focal length, rotation (orientation), and angle of view. Focal length is directly linked to angle of view; if one goes up, the other goes down. With angle of view, as the angle of the lens widens, you must move the camera closer to the subject to keep it at the same relative size in the frame. The wider the angle, the higher the value for the Angle of View setting. Creating Cameras Create > Cameras > Camera There are three types of perspective cameras in Maya. As with Mayas lights, you can change a camera to any other camera type in the Attribute Editor. Camera With this camera type, you see only the camera icon. In general, because this camera freely rotates and loses track of its "up" vector, you should use it only when youre linking the camera to another object for movement and animation, or when youre placing a camera in one fixed spot. Camera and Aim This camera includes a camera target and an aim handle for adjusting the camera target. In addition, this camera automatically stays level in relation to the horizon, so its the one youll use most often. You can make this camera roll if you want, but by default, it stays level except at extreme straight-up or straight-down orientations.
  10. 10. Camera, Aim and UpThis camera type includes two handles: the aim handle, described for Camera and Aim,and an up handle for banking (leveling) the camera. This camera type is useful whenyou want to bank the camera during your animation. Fig6-1 Camera typesCamera SettingsThese are the key settings for cameras under the Camera Attributes section:
  11. 11. Fig 6_2 Camera AttributesControls In this drop-down list, you can quickly select the camera type you want.Angle of View and Focal Length Controls the amount of perspective exaggeration.Raising the Angle of View attribute lowers the Focal Length attribute.Camera Scale You can change the camera size in relation to your scene, which affects
  12. 12. scene objects when you render. Camera Scale is like a multiplier for the Angle of View setting. For example, decreasing Camera Scale to .5 halves the cameras view area, but makes objects in the scene look twice as large. Clip Planes Only objects located within the values specified for the cameras clip planes appear in the scene. If distant objects are not showing up in your scene, raise the Far Clip Plane value. If nearby objects seem to be appearing in cross-section or not appearing at all, lower the Near Clip Plane value. Depth of Field Enable distance blur with this attribute. It can be a render-intensive effect, but yields a nice cinematic result because objects close to and far away from the focus point are progressively blurred. Background Color The background fill color for images rendered from this camera; you can also use this section of the Attribute Editor to add an image or shader as the background. Orthographic Views Switches the camera to an orthographic view. You can create perspective cameras, rotate them into position, and then set them to orthographic to get a "flat" view for projecting textures onto an object. Animating the Camera When you first begin animating the camera, it helps to follow the rules of videography, such as avoiding jarring camera motions—rapid pans, zooms, or rotations of the camera. In addition, you should usually give the camera the impression of having mass. The virtual camera, by default, starts and stops moving instantly, which looks unrealistic and abrupt to viewers. To avoid this problem, adjust the tangents for the camera positions start and stop keys in the Graph Editor so that motion begins and ends gradually . Do the same for the cameras aim point keys and any other animated camera attributesLightingLighting design in Maya is similar, but not completely identical, to how its done in the real world. You haveseveral types of lights to choose from in Maya; each one has unique attributes and benefits, and youll learnwhat each type is best used for. When you know how to work with lights, scenes that once rendered dull cantake on a new radiance. Most of the time youre trying to get a realistic effect with your lights, and Mayasvirtual lights do not work in a realistic way—in particular, beams of light within Maya do not reflect offsurfaces. In the real world, even a single light source can fully illuminate a room because its beams reflectfrom surfaces to reach areas under desks and shelves .In Maya, however, those areas are completely dark,so one solution is to simulate diffuse reflection by adding many low-level lights.Creatively, lighting defines the scenes mood. If youre trying to create a chilling, spooky effect, youllprobably want dim lighting in the scene. For a feeling of suspense, you might decide to have flickering lights.Lighting in a scene creates the shadows, influences colors, and directly affects the appearance of materials.The results of a well-lit scene are worth the effort and time. Skillful lighting creates contrast betweenobjects, enhances the colors in your scene, and gives you more control over the scenes shading.
  13. 13. Light TypesSeveral different lights are available in Maya 5, each with its own properties and uses: Ambient, Directional,Point, Spot, Area, and Volume lights. Fig 6-3 Types of LightsAmbient LightThe Ambient light type creates light on all surfaces. It is in no way comparable to the real-world ambientlight that creates the diffuse reflection of surfaces. Instead, its a kind of auto-self-illumination that brightensall parts of your scene equally. For this reason, this light type should be used sparingly or for special casesonly, or it can give your scene a washed-out or flat appearance. Mayas Ambient lights can also castshadows. In essence, these features allow you to use Ambient lights as though they were Point lights, with avariable "shine everywhere" setting. This setting is called Ambient Shade, and the light behaves more like aPoint light as this value approaches 1.Directional LightThe Directional light is the default light used when you create a new scene. This light is good for emulatingrays of light coming from the sun and does a fine job of lighting the entire scene instead of just targetedareas.Point LightUnlike the Directional light, which has light rays that are parallel to each other, a Point light casts rays oflight evenly in every direction from a point. Point lights are sometimes used for simulating omni directionallight sources, such as light bulbs.Spot Light
  14. 14. The Spot lights area of illumination is defined by a cone, and within the cones specified range, light is castevenly. Starting from an infinitely small point in space, a Spot light spreads as it moves farther from theorigin. Spot lights are useful when youre trying to create beams of light from, for example, a prison watchtower, a lighthouse, and so forth. Fig 6-4 Attribute EditorArea LightWith Area lights, you can have a source of light that doesnt just come from an infinitely small point inspace. The Area light emits rays from a rectangular area in space and can be scaled larger or smaller. Thismakes an Area light a great choice when youre looking for realistic lighting, but be forewarned that it takeslonger to render. By using an Area light, youll get shadows that soften as theyre cast farther from theshadow-casting object. Maya uses only two-dimensional flat Area lights that are rectangular.
  15. 15. Volume LightVolume lights have a visible range of influence that allows you to see exactly where the light dies out. Bydefault, the light intensity falls off linearly from the lights center point to the visible outer boundary. Thistype of light is ideal for interior lighting, because you usually want lights to fade with distance if theyreprimary sources of light. Fig 6-5 Light AttributesLight Attributes
  16. 16. IntensityA lights Intensity attribute controls the brightness of the source. You can set it to any value, positive ornegative. If the intensity is raised, more light is emitted from the source . Usually, you set the valuebetween 0 and 1 for a medium-intensity fill light. For sunlight effects, you might go as high as 1.5 or so.With Decay Rate added , the lights Intensity value might need to be set much higher because the strengthcan fall off rapidly with distance. All Mayas default lights have no decay rate and illuminate objects at fullintensity, regardless of distance.You can also use negative values for the Intensity attribute. By setting anegative value, the light actually "absorbs" other light. If you have an area of the scene that you want to bepitch-black but have light illuminating it, you can use a light with a negative Intensity setting to helpeliminate the problem.Illuminates by DefaultBy default, lights automatically illuminate all objects in the scene. When you disable the Illuminates byDefault check box, the light is removed from the default Light Set and affects only objects its linked to.Light linking is handled in the Relationship Editor for lights (Window > Relationship Editors > Light Linking).In this dialog box, you can select a light and then choose which objects it illuminates . Fig 6_6 Relationship EditorEmit Diffuse and Emit SpecularThe Emit Diffuse and Emit Specular attributes are not available with Ambient lights. Emit Diffuse isparticularly useful for creating soft fill lights to simulate light reflection; you need to disable the EmitSpecular attribute so that no highlights are generated. Emit Specular can also be useful for lighting metalobjects (such as chrome logos) when you want to add specular highlights to the metal without brighteningother areas.
  17. 17. ColorEach light can have its own color assigned, and modifying the color of a light follows the same procedureand uses the same Color Chooser dialog box you see when modifying color for a material. You can also maptextures to a lights color, causing the light to project the texture like a slide projector. Or if you animate thetexture variables or use a movie as the source, the light acts as a movie projector.Decay RateSpecific to Spot, Area, and Point lights, this attribute determines the rate at which the light intensity fades(decreases) at a distance. Several types of decay are available in the Attribute Editors Decay Rate list box.No Decay The light does not diminish with distance; it reaches all objects in the scene.Linear The intensity of emitted light decreases at a constant (linear) rate as distance from the light sourceincreases. Linear decay is the most frequently used type because its easier to control; you dont need toraise the lights Intensity attribute to enormously high values to compensate.Quadratic A physically accurate mode of decay, also known as inverse square. Quadratic decay isdetermined by proportionally decreasing the light intensity along the square of the distance. Light intensitygenerally must be raised substantially with this mode.Cubic Decreases the intensity of light faster than the rate seen in reality. Cubic Decay is evaluated by adecrease in intensity thats relatively proportional to the cube of the distance. The lit area falls off almostinstantly with Cubic Decay. This type of decay can be used to create a lit area that seems as though itsburning within surrounding darkness.IPR rendering is a helpful tool for interactively adjusting light decay; its hard to visualize otherwise.ShadowsShadows in Maya can be turned on or off. The default setting for lights is to have the shadow set to off.Surfaces illuminated by the non-shadow–casting light are still shaded by it, but wont cast shadows ontoother surfaces. That means the part of an object thats exposed to light is illuminated, and the objectsopposite side fades to a darker tone. An objects shadow can identify its size, position, and orientation inspace, so by adding shadows to your scene, you can more clearly define the spatial relationships betweenobjects. Without shadows in a scene, the render looks flat and lacks depth. Shadows add depth and realismto the scene, especially indoor scenes.Shadows tend to wash each other out as you add more shadow-casting lights that illuminate the same area.With Maya, you have a lot of control over the way shadows are cast in a scene, which can help you reducerender times, add contrast to your renderings, and create a better-looking overall result. There are twotypes of shadows in Maya: depth map and ray traced shadows.Depth Map ShadowsDepth map shadows are produced through an image map. The depth map is calculated immediately beforethe actual render takes place. Using calculations for the distance of light to a specific point on an object,depth information is stored in the map and then passed on to the rendering engine to produce a "simulated"shadow effect. The depth map tells the rendering engine which areas of the scene are illuminated by lightDepth map shadows usually give good results without having to worry about a huge increase in render time.They are usually slightly softer, too, which is more natural than harsh-edged ray traced shadows. If you
  18. 18. want, you can achieve almost the same level of sharpness as ray traced shadows. Depth map shadows workin a unique way for Point, Ambient, and Area lights: Because a square bitmap is required to create theshadow, and these light types cast light in all directions, they must create multiple maps to cover the area.Maya uses cubic shadow maps for these light types—that is, six depth maps are cast for the six sides of acube. This process requires six times the RAM, which could be a concern for large map sizes.The main drawback to depth map shadows is that they dont take materials transparency into account.Depth Map AttributesShadow Color Applicable to both types of shadows in Maya. Changing the Shadow Color attribute changesthe shadows color seen in the render. Its often a good idea to bring shadow colors a little brighter thanpure black, to add to the simulation of diffuse light reflection. You can also map an image file or a texture tothe Shadow Color, just as you would map an image to a material.Dmap Resolution Specifies the resolution (accuracy) of a depth map shadow. The maps are square, so if youset this attribute to 1024, the shadow map is produced as a 1024x1024 pixel image. When setting DmapResolutions, try to use values that are powers of 4, such as 128, 256, 512, and 1024. These numbers areeasier for Maya to calculate with and can result in faster render times. At very large sizes (4096+), RAMconsumption can become a problem. Increasing the resolution also reduces the jagged effect, but creates asharper shadow edge.Dmap Filter Size Directly affects the edges of a depth map shadow by making them softer. This attribute,combined with the Dmap Resolution, can smoothly and gradually soften a shadows edge. Be aware thatincreasing this value increases render times. Use values between 1 and 3, unless you truly need to gohigher.Dmap Bias When depth map shadow–casting lights are casting long shadows, they can sometimes separatefrom the objects. This setting allows you to adjust the placement of the shadows, and you usually need toadjust it only for very low light angles (such as a setting sun).Raytraced ShadowsRaytraced shadows are generally slower to compute, but offer the advantage of lower RAM requirements,soft shadows, and properly cast shadows for objects that have transparency, such as windows. To makeraytraced shadows appear in your renderings, you must go to the Render Global Settings window andenable raytracing. Like the Area light, the Spot, Directional, Ambient, and Point lights can cast areashadows. In this case, the soft shadows are created by having the light cast from a circular source. Non–Point light sources create soft shadows (known as penumbral shadows) because a variable amount of thenon–Point light source is blocked as an object passes in front of the light.Transparent objects can affect shadows if the shadows are raytraced. However, the color values do notaffect shadow color. To cast colored raytraced shadows, you must set or map the transparency color for thematerial.Raytraced Shadow AttributesLight Radius Sets the imaginary size of the circular Area light effect.Shadow Rays Controls the sampling of soft shadows. If you use a low number, the shadows look speckled,but render faster. This is similar to the way that Dmap Filter Size works with depth map shadows, in thatincreasing the Shadow Rays setting reduces the shadows graininess.Ray Depth Limit This setting enables you to limit the number of times a light bounces from reflective andrefractive materials. You can raise this value if you want to allow raytraced light rays to bounce around thescene before eventually creating a shadow.
  19. 19. Area Light ShadowsIf you set Area lights to cast raytraced shadows, the shadows are calculated from the rectangular Area lighticon, based on its size. The results are similar to circular Area lights. As with circular Area lights, moreShadow Rays soften the shadow, but result in substantially longer render times.In animation, theres more to animate than simple movement. Animation requires thinking about motion,timing, and smoothness of action. Almost anything in Maya with a number attached to it can be animated.Maya simplifies your work in creating the essence of animation---timing and motion. With maya , you cananimate virtually anything you can imagine, no matter how surreal.Animation Control and InterfaceWith Mayas animation controls, you choose how to key and play an animation. Two components of Mayasuser interface are specific to animation: the Range Slider and the Time Slider. You can also quickly accessand edit animation preferences from the animation controls area. Fig 7-1 Animation controlsBetween the Range slider and the Animation Preferences button are the current character control featuresand the Auto Key button.Time SliderThe Time Slider is a vital part of the animation interface in Maya. The Time Slider Controls the Playbackrange, keys and breakdowns with in the playback range. Fig7-2 Time sliderClick in the Time Slider area and drag left and right to "scrub" the animation back and forward intime.
  20. 20. Key TicksKey Ticks are red marks in the Time Slider where you set a key for the selected object. Breakdowns are aspecial type of key .The visibility of Key Ticks can be turned off or on in the Preference window. The currentTime indicator is a gray block on the Time Slider. You can drag it to move forward and backward in youranimation.Current Time FieldA black line indicates the current time field. When keys have been set for the currently selected object, thinvertical red lines appear in the Time Slider area to indicate the times for those keys.Range SliderThe Range Slider controls the playback range reflected in the Time Slider. The Range Slider sets the totallength of the animation in frames. You can also use the Range Slider to temporarily limit the range ofplayback and set the playback start and end frames. Fig 7-3 Range sliderYou can toggle whether the Range Slider is Displayed or hidden by selecting Display>UI elements>RangeSlider.Animation Start Time sets the start time of the animation.Animation End Time sets the end time of the animation.Playback Start Time This shows the current start time for the playback range. You can change it byentering a new start time.Playback End Time This shows the current end time for the playback range. You can change it by enteringa new end frame.Range Slider Bar This lets you control the playback range of your animation up to the limits of theAnimation start/end settings.you use the Preferences dialog box to change values for the animation timeline and playback. You can alsoset the total time for your animation, the size of the timeline , and other related features.
  21. 21. Fig7-4 Preferences dialog boxTerms in AnimationFrame RateFrame rate is the first aspect of animation. By default, Maya sets your animation to Film, which plays at24fps.You use 30fps in the United States and 25fps in other countries.RangeThe range of an animation determines the total length in frames. Then, multiply the animations length inseconds by the frame rate .For e.g in this case you are using 24fps and animation length is of 2seconds. 24fps X 2secs =48 FramesSetting KeysYou can set a Key by selecting Animate >Set Key. The attributes set by this menu item depend on the setKey option settings.
  22. 22. Animation TypesThere are following types to animate your scene.Path AnimationIn this method, you create a NURBS-based curve and then attach an object to it in your scene. The objectthen follows the curved path to simulate motion. You can choose at which time the object is positioned atany point along the path, so the object can reverse itself, pause, or oscillate, if you want. The objectautomatically rotates from side to side as the curve changes directions. If the object is geometry, it can alsobe automatically deformed to follow the contours of the curve.Select Animate>Motion paths>Attach to Motion pathTo Animate an object along a surfaceChoose create >Nurbs Primitives > Plane to create a Nurbs plane.Select Modify>Transformation Tools>Proportional Modification Tool to introduce contours on the plane.Select Modify > Make Live ,then draw a curve on the plane.Create an object to animate along the path , and shift -click on the curve on surface to select it.Select Animate>Motion Paths >Attach to Motion Path option window. Ensure that follow is on ,and set theup direction to normal so that the object will stay normal to the surface.Click play to see your animation.Flow Path Object FunctionThe Flow Path Object function creates a lattice around an object .Select Animate>Motion paths>Flow Path ObjectKeyframe AnimationKeyframe animation is the standard animation method. In this method, you set keys for an objects extremepositions and let the computer fill in the in-between motion. A key is an anchor point for a particularattribute at a designated time. When the animation reaches that specified time, the objects attribute will beat the value you set. As you set keys, you specify the time at which those changes in the attributes valuetake place.To set keys with the auto keyframe method, you click the Auto Keyframe button in the Range Slider (it turnsred to indicate that its enabled). With auto keyframing, you can animate quickly by simply dragging theTime Slider to a given frame and then changing an attribute.Nonlinear AnimationNonlinear animation is a more advanced method of animation. Unlike keyframing, nonlinear animation iscompletely independent of time. You blend and layer animation sequences—called clips—to set up themotion for objects. You can also use this method to explore variations in parts of the animation withoutlosing your previous work or affecting other parts of the animation. For example-you can make the walking
  23. 23. part of the animation a clip and then adjust the leg motion without affecting the way the rest of thecharacter moves.Graph EditorThe Graph Editor is a helpful tool for tweaking values for keys you have set. It gives you a visualrepresentation—a curved line—of the attributes that are animated. The animation time goes from left toright, and any keyed variable appears as a line that ramps up or down to indicate its value over time. It canhelp you visualize how things are changing and how fast. You can pan and zoom this panel like any other. Fig7-5 Graph EditorTo use it as a free-floating window, simply open it from the Hotbox (Window >Animation Editors> GraphEditor).Graph Editors ComponentsMenu barThe Graph Editor menu bar contains tools and operations for manipulating animation curves and keys within the graph view of the Graph editor. The Edit menu is similar to the one in text editors or word processors,except that youre working with keys instead of text.
  24. 24. Fig 7-6 Menu BarThe Edit MenuThe menu items appear under Edit menu behave in a similar fashion to the main Edit menu in the modelingview.The View MenuThis menu controls which components are visible, and therefore editable, in the graph view of the GraphEditor.The Select MenuThese options control which component of an animation curve are available for selection and editing.The Curves MenuThe Curves menu gives you control over how the curves are set up with the keys in your scene.
  25. 25. The Keys menuThis menu includes Tangents which causes the manipulation of an in or out tangent handle.The Tangents MenuThis describes the entry and exit of curve segments from a key.The List MenuThis menu Loads the objects.ToolbarThe toolbar gives you quick access to functions for modifying animation curves and keys. Fig 7-7 ToolbarBuffer curves Use Buffer Curve snapshot and swap Buffer curves to compare changes to the currentanimation curve with its previous shape.Break Tangents Allows manipulation of the in and out tangent handles individually so you can edit the curvesegment entering the key without affecting its opposite handle.Unify Tangents causes the manipulation of an in or out tangent handle to affect its opposite handle equally.It retains the relative position of the tangent handles even after tangents are individually adjusted.Lock Tangent Weight specifies that when you move a tangent ,only its angle can be changed.Free Tangent Weight specifies that when you move a tangent ,only its angle can be changed. This allows theweight of a tangent to be adjusted as well as the angle.Clamped tangent creates an animation curve that has the characteristics of linear and spline curves. Thekeys tangents will be spline unless the value of two adjacent keys are very close.Step tangent creates an animation curve whose out tangent is a flat curve.
  26. 26. Flat Sets the in and out tangents of the key to be horizontal.The Dope SheetThe Dope Sheet is another animation editor in Maya that is similar to the Graph Editor. Instead ofdisplaying curves, the Dope Sheet displays key times as colored rectangles and lets you edit event timing inblocks of keyframes and synchronize motion to a sound file.To open the Dope SheetSelect Window > Animation Editors > Dope Sheet Fig7-8 Dope sheet editorTo Place the Dope Sheet in a ViewSelect the view.Select Panels > Panel > Dope Sheet.Keyframe AnimationKeyframe animation is the standard animation method. In this method, you set keys for an objects extremepositions and let the computer fill in the in-between motion. A key is an anchor point for a particularattribute at a designated time. When the animation reaches that specified time, the objects attribute will beat the value you set. As you set keys, you specify the time at which those changes in the attributes valuetake place.To set keys with the auto keyframe method, you click the Auto Keyframe button in the Range Slider (it turnsred to indicate that its enabled). With auto keyframing, you can animate quickly by simply dragging theTime Slider to a given frame and then changing an attribute.
  27. 27. Nonlinear AnimationNonlinear animation is a more advanced method of animation. Unlike keyframing, nonlinear animation iscompletely independent of time. You blend and layer animation sequences—called clips—to set up themotion for objects. You can also use this method to explore variations in parts of the animation withoutlosing your previous work or affecting other parts of the animation. For example-you can make the walkingpart of the animation a clip and then adjust the leg motion without affecting the way the rest of thecharacter moves.Graph EditorThe Graph Editor is a helpful tool for tweaking values for keys you have set. It gives you a visualrepresentation—a curved line—of the attributes that are animated. The animation time goes from left toright, and any keyed variable appears as a line that ramps up or down to indicate its value over time. It canhelp you visualize how things are changing and how fast. You can pan and zoom this panel like any other. Fig7-5 Graph EditorTo use it as a free-floating window, simply open it from the Hotbox (Window >Animation Editors> GraphEditor).Graph Editors ComponentsMenu barThe Graph Editor menu bar contains tools and operations for manipulating animation curves and keys within the graph view of the Graph editor. The Edit menu is similar to the one in text editors or word processors,except that youre working with keys instead of text.
  28. 28. Fig 7-6 Menu BarThe Edit MenuThe menu items appear under Edit menu behave in a similar fashion to the main Edit menu in the modelingview.The View MenuThis menu controls which components are visible, and therefore editable, in the graph view of the GraphEditor.The Select MenuThese options control which component of an animation curve are available for selection and editing.The Curves MenuThe Curves menu gives you control over how the curves are set up with the keys in your scene.
  29. 29. The Keys menuThis menu includes Tangents which causes the manipulation of an in or out tangent handle.The Tangents MenuThis describes the entry and exit of curve segments from a key.The List MenuThis menu Loads the objects.ToolbarThe toolbar gives you quick access to functions for modifying animation curves and keys. Fig 7-7 ToolbarBuffer curves Use Buffer Curve snapshot and swap Buffer curves to compare changes to the currentanimation curve with its previous shape.Break Tangents Allows manipulation of the in and out tangent handles individually so you can edit the curvesegment entering the key without affecting its opposite handle.Unify Tangents causes the manipulation of an in or out tangent handle to affect its opposite handle equally.It retains the relative position of the tangent handles even after tangents are individually adjusted.Lock Tangent Weight specifies that when you move a tangent ,only its angle can be changed.Free Tangent Weight specifies that when you move a tangent ,only its angle can be changed. This allows theweight of a tangent to be adjusted as well as the angle.Clamped tangent creates an animation curve that has the characteristics of linear and spline curves. Thekeys tangents will be spline unless the value of two adjacent keys are very close.
  30. 30. Step tangent creates an animation curve whose out tangent is a flat curve.Flat Sets the in and out tangents of the key to be horizontal.The Dope SheetThe Dope Sheet is another animation editor in Maya that is similar to the Graph Editor. Instead ofdisplaying curves, the Dope Sheet displays key times as colored rectangles and lets you edit event timing inblocks of keyframes and synchronize motion to a sound file.To open the Dope SheetSelect Window > Animation Editors > Dope Sheet Fig7-8 Dope sheet editorTo Place the Dope Sheet in a ViewSelect the view.Select Panels > Panel > Dope Sheet.MAYA Tutorial - Dynamics and Special Effects Page 1 of 2 Dynamics Dynamics in Maya can be applied to objects using rigid-body or soft-body settings. With simple dynamics, also known as rigid-body dynamics. You can use NURBS or polygonal objects in dynamics simulations, but you must consider the objects surface
  31. 31. directions.Objects that interact can be active or passive. Passive objects, althoughthey can be keyframe-animated, remain stationary; they can cause collisions , butarent affected by them. Objects that are going to react to collisions must be set toactive. You can switch an active object to passive and vice versa by setting the Activeattribute in the Channel Box to on or off. You can also use Mayas Dynamics mode tosimulate reality in how objects behave—for example, animating the way bowling pinsreact when struck with a bowling ball.Soft Body DynamicsSoft-body dynamics are handled in Maya by creating a set of particles that surroundthe object and influence it. When these particles collide with something or are movedby fields, the connected geometry moves with them. This is ideal for creating effectsthat mimic cloth and organic flexible materials. To get a realistic response, you mustadd goals or springs. Goals give the object a target shape to move toward, like arubber squeeze toy that un-squeezes back to its original shape. Alternatively, springsadd a lattice of tensioned springs throughout the geometry, like adding a box spring ofrigidity to the object.Creating a Soft-Body SystemAny polygonal or NURBS object can be made into a soft body .You usually make anobject soft with Bodies > Create Soft Body> option box, and then determine whetherthe object simply becomes soft or is duplicated to keep the original object as a goal.Normally, you choose the latter method so that the soft body tries to configure itselfback to the shape of the original object. In either case, the object is then soft, butdoesnt collide with other objects in the same manner as with rigid-body dynamics.Soft /Rigid Bodies > Create Soft Body >Sets the options when creating a soft body.Make SoftConverts the object to a soft body.Adding SpringsWhen the object must be more resilient than a soft cloth, you can add the Springsattribute to give the object a kind of support structure. This attribute creates a virtualspring object between each particle. Wire Walk Length setting. parameter connectssprings not only between a particle and its neighbor, but also the neighbors neighbor,and so forth. The default setting is 2.Active and Passive BodiesObjects that interact can be active or passive. Passive objects, although they can bekeyframe-animated, remain stationary; they can cause collisions but arent affectedby them. Objects that are going to react to collisions must be set to active. You canswitch an active object to passive and vice versa by setting the Active attribute in theChannel Box to on or off.You can set values for Initial Velocity and Initial Spin for active objects .
  32. 32. Fig8-1 Dynamics settings for active rigid bodiesFieldsFields are localized or global forces that act on objects. You can simulate the motion ofnatural forces with dynamics fields.Fields have their own icons in a scene, so itseasier to select them if you want to animate a field or change its attributes. Thesefields are included with Maya.Stand-alone fields influence objects from a stationary or moving position in theworkspace. Its not owned by geometry.Object Field are owned by an object and exert influence from the object. You can addfields to polygons, Nurbs curves or surfaces, particle objects, lattices or curves on thesurface.Volume Fields You can select a volume to define the region in space in which particlesare affected.The following fields are included with Maya: Air An air field simulates the effects of moving air. The objects you connect to the air field accelerate or decelerate so their velocities match that of the air as the animation plays. A "push" type of field, it comes with presets for Wind,
  33. 33. Wake, and Fan. Drag a field that slows the momentum over time of objects within its reach. A drag field exerts a friction or braking force on an object thats animated with dynamic motion. Gravity The most commonly used field, it causes objects to move and accelerate in a given direction. You can limit its reach to create localized gravity fields. It simulates the Earths gravitational force. Newton Similar to gravity, but operates in a spherical manner. A newton field pulls object towards it. Objects are attracted to Newton fields more strongly depending on their mass and their distance from the Newton field. Radial A radial field pushes objects away or pulls them toward itself, like a magnet. Like the Newton field, but it doesnt take mass into account. It can be set to diminish with distance, as with the Gravity and Air fields, and it can be set to push or pull. Turbulence Makes the objects motion or deformations more random. Turbulence is usually applied to soft bodies or particles to create the impression of wind or waves. Uniform A field that pushes objects in a specified direction. Like the Gravity field, but without the progressive acceleration that Gravity includes. Vortex A kind of rotating gravity, the Vortex field pulls objects in a spiraling motion thats centered on the fields icon. Often used to create galaxies, whirlpools, or tornados with particle systems. Volume Axis A complex field that lets you specify a volume shape (cube, sphere, cylinder, cone, or torus) and then create effects that work within the shape. You can use the Volume axis field to create effects such as particles flowing around obstacles ,solar flares, mushroom clouds, explosions, tornadoes, and rocket exhaust.MAYA Tutorial - Dynamics and SpecialEffects Page 2 of 2 Constraints Constraints are used to restrict an objects motion. After you apply constraints, they are connected to the object theyre associated with. Maya includes the following constraints: Nail Ties an object to a point in the scene. The object behaves as though its tethered by a solid rod, but it can orbit anywhere around the tie point as it collides with objects or is affected by fields. You can not use a Nail constraint on a passive rigid body. Pin This type of constraint requires two objects that are tied together to a separate pivot point. You can use a pin constraint to create effects such as
  34. 34. link in a chain or robotic arm. Hinge As the name implies, you get free rotation constrained to an axis. You can make active objects hinge to a point in space, to another active object, or to a passive object. Spring This constraint is similar to the Nail constraint, but it also has a telescoping characteristic that allows it to extend its length. As with the Hinge, you can use the Spring to tie an active object to another active object, to a passive object, or to a point in space. Barrier Blocks objects from going beyond a planar boundary. You can assign this constraint to only one object. Objects can deflect, but not bounce, from the Barrier constraint, so its recommended for objects that block other objects, such as walls or floorsPartilesParticles can be particularly helpful when you want to create and animate dozens,hundreds, or thousands of similar objects that vary slightly in their geometry oranimation. You can also use Mayas Dynamics mode to simulate reality in how objectsbehave—for example, animating the way bowling pins react when struck with abowling ball. Another feature in Mayas Dynamics mode is the ability to create "soft-body" effects, in which objects deform as though they were made from rubber orgelatin. Dynamics and particles—work together to create animation. With rigid-bodydynamics, the idea is to simulate physics so that objects collide with each other anddeflect. With soft-body dynamics, objects change (deform) as a result of theircollisions. With particles, you can easily control the animation of large numbers ofobjects.What are Particles A Particle object is a collection of particles that share the same attribute. In maya ,Particles are points you display as dots, streaks, spheres, blobby, surfaces etc. Youcan animate the display and movement of particles with various methods, forinstance, Keys, expressions, and field such as gravity. Particles are ideal for animatingdifficult effects, such as explosions, swarms of bees, and galaxies of stars.In maya, weuse particles for creating special effects.Creating ParticlesTo create particles in your scene, you can use drawn particles or particle emitters. Topaint particles in your scene, choose Particles > Particle Tool > option box. Anothermethod called Particle Grid is available, which you use to define the corners of a 2Drectangle thats filled with particles. Particle grids can be helpful for visualizing theeffect of fields as you create them.In Maya, the source that particles emanate from can be many things.Point - omni An emitter that sprays particles from a point in all directions.Point - directional An emitter that sprays particles in a linear or conical direction froma point.Volume Particles are created from multiple points within a defined volume, which canbe a cube, sphere, cylinder, cone, or torus.Surface You can define one of your scenes NURBS or polygon objects to create
  35. 35. particles from its surface.Curve Any NURBS curve can emit particles.Animate the ParticlesYou can animate particle motion in several ways.Set the position, velocity or acceleration attributes of particles. You can set keys toanimate an entire particle objects translate, scale and rotate attributes.Apply fields , such as gravity to particles.Turn geometry into a collision object and bounce particles off it.Make the particles follow a moving goal object.Particle TypesIn Maya, there are two types of particles: hardware rendered and software rendered.Hardware particle render much faster using your graphics cards on-board hardware.Hardware particle types must be rendered with the hardware-rendering system(Window> Rendering Editors >Hardware Render Buffer), because the particles dontappear in the normal software render.The Hardware Render Buffer has an option for masking any particles that fall behindscene objects. Another issue is that, by default, hardware rendering looks jagged .Maya handles ant aliasing similarly by multisampling in the Hardware Render Buffer,which is enabled by choosing Render>Attributes on the Hardware Render Buffermenu.Hardware-Rendered ParticlesPoint The default particle type, designed to render as a spot. You use the rendersettings in the Hardware Render Buffer, under Render> Attributes.After you addattributes for a particle render type, you can change the render type and add itsdefault Particle Render Type attributes.Multipoint Like the Point particle type, but creates clusters of points to get a denser,clumpier appearance.You can use this render type to create dust, cluds,most or othergaseous emissions.Streak Similar to the Point, but creates a streaking line instead of a dot. This typedoes not render until the particles are moving and you attempt to hardware-render aframe with particle motion. The Streak length is based on the velocity of the particles,so if the particles are stationary or moving slowly, you wont see the particles.Multistreak Like the Streak particle type, but creates clusters of streaks to get adenser look.Sprites Render type lets you display a texture image or image sequence at eachparticles.Each particle can display an identical or different image.Asprite appears as asmall rectangle until you map a texture image to it .Spheres These are three-dimensional spheres and render type displays particles as
  36. 36. opaque spheres.Numeric This particle type displays a number for each particle. Its particularly usefulfor troubleshooting stray particles.By default, Maya displays particle ids for thenumeric render type.Hardware-rendered particles cannot cast shadows or appear in reflections orrefractions:Software-Rendered ParticlesThe following particle types render as part of your scene when you render a frame.They are able to reflect, refract, and cast shadows.Blobby Surface A particle form of metaballs, the blobby surfaces look like spheres untilthey approach another, at which point they reach for each other like drops of mercury.They appear only in software rendered images.To set Blobby Surface render typeSelect the particle object. In the attribute editor ,set Particle Render Type to BlobbySurface. Apply a shading group to the particle object and then add a light to thescene. Software render the scene.Cloud The cloud render type displays particles as blurred or cloudy metaballs. Thisparticle type works specifically with the Particle Cloud material type and doesnt renderwith typical object "surface" materials.Tube As the name implies, the source object type is a kind of uncapped cylinder. Youcan define the radius at the two ends and renders only with volumetric material types.Instanced Geometry If you want to have an object stand-in for the particles, youshould use Mayas Instancer, which enables you to use any kind of geometry ortextures you like.AddingReflctions, Refractions and shadows to Software - renderedparticlesSelect the particle object. In the attribute editor turn on---visible in reflections, visiblein refractions and cast shadows.CollisionsAny particle system can collide with any scene geometry, but you have to set eachcollision up separately. To do so, you select the particles, Shift-select the geometrythey will collide with, and choose Particles > Make Collide. The particles then collide ifthey hit the object.GoalsParticles can also be set to have goals, meaning that the particles try to move to aspecific configuration, shape, or location. You can create goals by selecting the particle
  37. 37. object you want to be affected by the goal. Shift-select the object you want toMAYA Tutorial -Rendering Page 1 of 1 The process of creating an image or sequence of images from a scene. During rendering, Maya generates a two-dimensional image, or series of images, from a specific view of a three-dimensional scene, and saves it as an image file. You can control the properties of rendered image files according to your post-production or presentation requirements. Maya software Renderer Mayas software renderer is an advanced, multi-threaded renderer. It is based on a rendering technology that is built directly into Mayas dependency graph architecture, which means its feature nodes can be intimately connected with any other feature in Maya. It is a hybrid renderer, offering true raytracing plus the speed advantages of a scan- line renderer. The Maya software renderer supports all of the various entity types found within Maya including particles, various geometry and paint effects and fluid effects. It also has a robust API for the addition of customer-programmed effects. Rendering an Animation When youre ready to render a finished animation, open the Render Globals button on the Status Line, just to the right of the IPR Render button. You can also activate it with Hotbox >Window > Rendering Editors > Render Globals. Render Global Settings
  38. 38. Fig 9-1 Render GlobalsYou can select the Maya Software (or standard) renderer, the Maya Hardware renderer,Mental Ray, or the new Maya Vector renderer from Render Global Settings window. In allrenderers, however, the information in the Common tab remains nearly the same. Thesettings for Start Frame, End Frame, and By Frame are activated if you choose a movie fileoutput format or a filename numbering extension for your saved files. A Frame Paddingsetting of 3 or 4 works for almost all situations. This setting determines how many digitsare added to the end of the filename, so setting Frame Padding to 4, for example, resultsin files being numbered as filename.0001.TGA, filename.0002.TGA, and so forth.The default animation render length is set to frames 1 through 10—a short animation.The Resolution section is where you set the image size; you can use the Presets list box tochoose from a range of resolutions. Most of your tests will be at a lower resolution,typically 320x240 or 640x480.
  39. 39. The second tab changes its name depending on what renderer youve selected. If the onlyrenderer options you see are Mayas software and hardware renderers. The Anti-aliasingQuality setting has a big impact on rendering speed and image quality. Images that arepoorly antialiased have a jagged appearance, particularly visible where different-coloredobjects overlap or in areas of high contrast.For tests, youd select the Preview Qualitysetting in the Presets list box; for final rendering, use the Production Quality setting, andselect the Gaussian or Quadratic B Spline Filter in the Multi-pixel Filtering section forsmoother-looking images.Render the scene using raytracingThe Raytracing section is where you configure raytraced reflections, refractions, orshadows to appear in the rendering; its disabled by default, so you need to expand thatsection to enable the options. Raytracing can also slow your rendering time dramatically.The numbers for the Reflections, Refractions, and Shadows attributes refer to the depth ofraytracing—the number of bounces allowed for a ray. As the ray strikes reflective orrefractive objects, it ricochets through the scene. If the number of bounces reaches thelimit set here, no further raytracing is done, and the pixel is colored based on thecontribution of the previous bounces added to black.Rendering a StillWhen you want to render a test frame, you simply activate the panel of the view youwant, and click Hotbox > Render > Render Current Frame. The settings in the RenderGlobal Settings window determine the resolution, ant aliasing, and raytracing, but only oneframe renders, and its saved as a temporary .iff (or whatever image format youve chosenas the default) file in the Images directory of your project. When the rendering is finished,you can save the rendered image to a permanent file by right-clicking on the Render Viewwindow and choosing File | Save Image in the Save dialog box that opens.For images you have rendered and saved, you can view them with Mayas FCheck utility.To cancel the renderPress Esc.Rendering Engines in MayaMaya 5 has added new rendering engines called Mental Ray and the Vector renderer. Youcan access these new renderers plus the Maya software and hardware renderers in theRender Global Settings window. With these new rendering options, Maya can quicklyproduce cartoon or web-like media with the Vector renderer and photorealistic rendersusing Global Illumination or HDRI in Mental Ray.

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