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NEW YORK CITY
COLLEGE OF TECHNOLOGY
THE CITY UNIVERSITY OF NEW YORK
V-RAY 1.5 FOR RHINO
ARCHITECTURAL TECHNOLOGY DEPARTMENT
written by Joseph Lim, Anne Leonhardt, Felix Rodriguez, with Dian Chen
revised May 4, 2015 7:13 PM
V-RAY FOR RHINO
Table of Contents
•	 Getting Started
•	 V-Ray Render Options
•	 Material Editor
•	 Assigning Materials
•	 Using Texture Mapping
•	 Lighting
1
(1-2)
(2-3)
(4-9)
(10)
(11-23)
(23-25)
Getting Started
V-Ray Render Options
Clicking the tag with the “O” brings up the options box
for V-Ray Render Options.
2
V-RAY FOR RHINO
To get started, click on Render > Current Render > V-Ray. The
Menu Bar will include V-Ray. Make sure that it is the current render.
If it’s not, click it. You should see a toolbar for V-ray that looks like this:
If you don’t see the toolbar for V-Ray, click on the toolbar menu,
and put a checkbox next to “New V-Ray For Rhino”.
DEFAULT SETTINGS
The default preset options in V-Ray for Rhino are configured
with relatively useful settings. Be careful not to adjust settings
unintentionally. However, if you do and you want to change
them back, in the options panel under V-Ray you can click on
Load Defaults.
In Render Options, V-Ray gives you the ability to
adjust and manipulate the:
•	 Global Switches,
•	 System,
•	 Camera,
•	 Environment,
•	 Image Sampler,
•	 DMC sampler,
•	 Color Mapping,
•	 VFB channels,
•	 Output,
•	 Indirect Illumination(GI),
•	 Irradiance Map,
•	 Brute force GI,
•	 Caustics,
•	 Default displacement,
•	 RTEngine.
All these tabs open a section of adjustments
according to your preference.
V-RAY FOR RHINO
4
DEFAULT SETTINGS
1. Global Switches
Please uncheck Hidden Lights and Default Lights
under the Lighting Section. We also recommend you
check the low thread pirority under the Render section
so that it won’t affect other program while rendering
with V-Ray.
2, Environment
Environment controls the contract, color, and HDR of
the Global Illumination.
-- Please check the boxes before GI and Background.
-- Please adjust those three iterms then select the blue
render icon on the top.
All these tabs open a section of adjustments
according to your preference.
3. Indirect Illumination
Please check “On” under indirect illumination on.
V-RAY FOR RHINO
3
Material Editor
Clicking the tag with “M” brings up the Material
Editor box for V-Ray Render Options.
V-RAY FOR RHINO
4
The materials workplace shows all the selected materials.
Right clicking allows adding, importing, exporting, renam-
ing, packing, removing, and selecting objects with cur-
rent materials, such as assigning current materials to the
selected objects or to the selected layers, deleting materi-
als that are not used in the scene, and adding layers with
reflections or refractions to the materials.
Material Preview
Options for material control. The optionn change with the
added scene materials in section A.
V-Rays’s Material Editor has three parts:
1.
2.
3.
5
Material: Diffuse Layer:
	
The Diffuse Layer of a material applies a color to the material.
The “M” box to the right applies pattern/textures and arranges
sequences.
Transparency adjusts the opacity. Black is completely opaque
and white is completely transparent. Grays represent interme-
diate levels of transparency.
V-RAY FOR RHINO
Material: Reflection Layer
Click on the object you would like to add reflection to. Click on
the Edit button under the Material
selections in the Property palette.
To add a reflection layer, click on the “+” next to the material
under the Material Workspace to show
all the layers. Right click on Reflection Layer. Select “Add new
layer” to add a new reflection layer for this material. There will
show Reflection under the material control section, as it shows
on the right.
V-RAY FOR RHINO
6
By default, a fresnel map is on the reflec-
tion layer, which is typically good unless the
objects is chrome or mirror.
Fresnel Reflections are a naturally occurring
phenomenon that states that an object be-
comes more reflective the greater the angle
at which it is seen. An example of this prin-
ciple would be a window that is seen from
straight ahead as opposed to at an angle.
Through manipulating the Index of Refrac-
tion (IOR) the reflective characteristics of an
object can be changed. A lower IOR means
that a larger angle is needed between the
observer and the surface before the object
begins to reflect. A higher IOR means that
a smaller angle is needed, which in turn
causes the object to reflect sooner. To have
your renderings be more physically correct,
it is recommended to have the IOR of an
object correspond to its actual IOR.
V-RAY FOR RHINO
7
Click on Reflection in the right section of the Material Editor and
then click on the m box to set Reflection. The Text Editor box ap-
pears.
If it is not already enabled scroll down the box next to Type, and
then select TexFresnel. IOR is to control the reflection intensity.
The 1.55 default shows a slight amount of reflectivity, but chang-
ing above 10 produces striking reflectivity. Chrome has an IOR
between 8 and 20.
Notice that the “m” on the right side of the Reflection in the Mate-
rial Editor is now changed to “M”. This means the Map has some
other characters associated with it now.
Above are six rendered samples each with a different
Fresnel IOR. The last one is rendered with full reflection to
create a chrome material.
V-RAY FOR RHINO
8
Reflection Glossiness
You don’t always get clear reflection from reflec-
tive material. Objects like matte finish metal,
wood and some plastic materials do not re-
flect the environment clearly due to it uneven
surfaces. This is because the uneven surfaces
create many reflecting angles for light to bounce
around. So the highlight is not as sharp if com-
pared to reflection from smoother surfaces. The
best way to create this kind of rendering quality
is playing around the setting of both Highlight
Glossiness and Reflection Glossiness.
The default value for both Reflection and High-
light Glossiness is 1, which means that the
reflections will be perfectly sharp. Once the value
is decreased below 1 the reflections begin to
become blurry.
A value of 0 would mean that the reflections
are completely blurred, and this would look
similar to a material without a reflection layer
at all. Setting this for regular materials would
cause extremely long render times. A good
range for creating glossy reflections is be-
tween .5 and 1. At values below .5 the effect
is similar to a material without reflections.
Below are results from combinations of vari-
ous intensities of Reflection Glossiness and
Fresnel IOR.
V-RAY FOR RHINO
9
Refraction Layer
To add this layer, click on the “+” to the right of the Object, and then right click on Refraction Layers. Select Add new
layer. You will see the Refraction layer added to the right of the window.
In the Material Editor, Reflection box, you can adjust the degree of transparency (white gives 100% transparency and
will not show the diffuse color).
To apply color to a Refractive material, the Fog Color is used, located in the lower right of the Refraction dialog box.
Click on the Fog Color and change it to the same color as the original Diffuse Color. Click on the Update Preview to
confirm.
Note: It is recommended to always have Affect Shadows (below the Fog Color) checked as it produces more realistic
effects.
V-RAY FOR RHINO
10
Assigning Materials
To add new material there are 2 options:
	 1. Right click on Scene Material, select Create Material, then select Standard.
	 2. Right click on the Scene Material, select Load Material to load saved material file.
V-Ray comes with its set of materials.
To Load a Vray Material right click on Scene Material and Select Load Material. A window will open to locate the VRay material.
VRay materials in school computers is found in Local Disk --> Program Data --> ASVGIS --> V-Ray Materials --> Vray mat -->
vismat_material_collection.
	
Note: V-Ray materials for at home computer will be under Local Disk --> Program Data --> ASVGIS --> V-Ray Materials
Material editing
To duplicate a material, change the name, remove, export, import or pack it, right click on the material
and choose one of these options.
Three other options for working with materials include:
•	 Apply materials to objects. Any materials under the Scene Materials can be applied to
	 objects by selecting an object/s prior to assinging the material.
•	 	 Apply materials to layers.
•	 Select objects by materials: Selects the objects in the scene having the material.
Note: Undo will not undo changes in the material editor.
Material application through Material Selection Material application through Layers
V-RAY FOR RHINO
12
Using Texture Mapping
Maps in V-Ray
Image texture maps are applied to the diffuse layer of a material. Click on the ‘m’ next to the color box under the
options panel of the diffuse panel.
V-RAY FOR RHINO
13
The following box will appear. First, choose TexBitmap from
the Type dropdown box on the left. Then make sure that
the mapping is set to explicit map channel. The map chan-
nel will be different for each layer of mapping you have, so
make sure that you note the channel. It is time to choose the
bitmap. Click on the ‘m’ next to file and choose your texture.
Some textures can be tiled, others cannot. Choose tile only if
the image is meant to be tiled.
V-RAY FOR RHINO
The following is a link to a tutorial for photoshop that shows you how to create a tile-able texture from a regular image:
http://psd.tutsplus.com/tutorials/interface-tutorials/how-a-turn-a-texture-into-a-seamlessly-tiled-background/
14
Mapping requires that we set how the images are placed on our objects.
-- Open the properties box for your object in Rhino and choose Texture Mapping.
-- Choose Custom Mapping
V-RAY FOR RHINO
Here is that channel again. Make sure it matches the channel for
your texture.
The projection is important for the way that the texture maps itself
onto the object. The following page covers all of the various types
of projection available.
Depending on your choice for projection, you may need to rotate
the texture to make it appear correctly.
If you have designed a non-tiling map, you may need to size it to
your object so that it does not tile. Click the Size to Objects button
to stretch the texture to fit the object exactly.
15
V-RAY FOR RHINO
These images illustrate a planar mapping. Notice that the map is “flat” or co-planar with
the x-y plane. This affects the way that the texture is applied.
This image illustrates what happens when we rotate the texture map 90 degrees to
“stand up” and be be coplanar with the x-z plane
16
V-RAY FOR RHINO
These images show the various types of mapping available, box, spherical, cylindrical,
and planar.
Bump Maps
Bump maps are created using the grayscale of the Bitmap to set the high and low texture. The bright part of the Bit-
map is considered as high part and the dark is low. The Bump map is seen more clearly at the part where the object
reflects the most of the light. Using Bump map texture to create bumped texture is only a visual effect, not the true
surface of the object. Look at the edge of the object and you will still see the smooth surface.
17
V-RAY FOR RHINO
To add a sense of texture, apply
the same material with the Bump
Map feature, which is found under
the Map box in the Material Editor.
Note***: Use the same settings for
tiling and projection that you used
for the texture map so that the tex-
ture and bump map images align.
(see section above).
18
V-RAY FOR RHINO
Displacement
Displacement allows you to recreate the texture of a surface by using a black and white image to describe
the varying height of the surface. This is very similar to how bump mapping works, but each method does
this in a different way. Bump mapping simply shifts the surface according to the image applied to it, with-
out actually changing the geometric structure of the surface. This causes bump mapping to be somewhat
limited in its capabilities of representing those surfaces. Displacement on the other hand actually creates
the geometry that is described by the image. This is done by subdividing a given piece of geometry and
adjusting the individual heights of all of the faces based on the image that it is describing.
The result is a surface that produces a much more accurate and realistic result.
Adding Displacement
Using displacement is very similar to using bump mapping. In fact, you can probably use your current
bump maps as displacement maps. In the Maps rollout of the material options there will be an option for
Displacement. Enable displacement by clicking the check box on the left, and then proceed to click on the
“m” to add a displacement map. Although textures are used for displacement maps in most situations it is
possible to add a displacement map via the procedural mapping.
Once either a texture or procedural mapping is added there is one last thing that you will have to pay at-
tention to while still in the texture editor, and that is the multiplier. The multiplier is what is actually going to
determine the final size of the displacement this will reference the Amount value in the Displacement roll-
out.
Displacement Parameters
In the V-Ray for Rhino Options there is a rollout which contains the parameters for displacement. It is im-
portant to note that these are global controls for all of the displacement throughout the scene. Currently
there is no individual controls on a per object or material level. This means that you must be aware of the
settings within this rollout when adjusting an individual material’s displacement.
19
V-RAY FOR RHINO
The Amount value may possibly be the most important value within the rollout, as this value will determine the scale
of all displacement. The Amount value is the number of scene units of an object with the texture multiplier set to 1.
This means that one could adjust the affect of displacement through either the Amount value or the texture multiplier,
but because the Amount value affects all displacement, it is recommended that it be left constant and the texture
multiplier be used to adjust the displacement of an individual material.
Both the Maximum Subdivisions and the Edge Length will affect the quality and speed of the displaced mesh.
Maximum Subdivisions will control the amount of subdivided triangles that are allowed to be created from a single
triangle of the original mesh. In general, it is better to have a slightly denser mesh and lower maximum subdivision
rather than a simpler mesh and a higher maximum subdivision. Depending on density of the render mesh created
by Rhino, the max subdivisions may not necessarily come into play. The edge length will determine the maximum
length of a single triangle. By default this value is expressed in pixels, but if you disable View-Dependant then the
edge length value will reference your scene units. Smaller values will lead to a higher quality, while larger values will
decrease the quality.
20
V-RAY FOR RHINO
Adjusting Displacement
Depending on how you set up your global displacement values you can set up your texture mul-
tipliers in one of two ways. The first way, which is the simplest, is to keep the Amount value in the
displacement options at 1 and to adjust the texture intensity as an expression of scene units. The
plane on the left has a texture multiplier of .5, which in this case leads to a maximum displacement
of .5 units. The plane on the left has a multiplier and maximum displacement of 2.
21
V-RAY FOR RHINO
Example 2
The image on the left is an example of the differ-
ent quality settings for displacement. The plane
on the left has an Edge Length of 24 pixels and
a Maximum Subdivision of 6. The plane on the
right has an Edge Length of 2 pixels and a Maxi-
mum Subdivision of 512
22
Example 1
The second way to set up displacement by
making the maximum displacement the Amount
Value in the V-Ray options and setting the tex-
ture multipliers as a percentage of that maximum
value. It the case of the two planes to the right
the Amount value is two. The plane on the left
has a texture multiplier of .25 and the plane on
the left has a multiplier of 1. You will notice that
the rendered image is the same in both cases.
That is because it is does not matter the method
that is chose, only that the multipliers are in line
with the desired effect
V-RAY FOR RHINO
Here is a comparison of bump mapping (left) and displacement (right). Both the maps and intensities are the same.
As you can see the bump map is limited in its ability to create the depth that is capable with displacement.
23
Each light content is differen. Other than color, multiplier and shadow on/off, each also had subdivs for shadow
quality control, Photon map for render quality control, Caustic subdivs control and Bias for shadow off set. The
difference is only with Directional Light, Point Light and Spotlight which have the ability to adjust the radius of
shadows.
Point Light and Spotlight are the ones need to control the Decay itself: Linear, Inverse and Inverse Square. The
last two Decay dramatically. So when using Inverse or Inverse Square, you must increase the multiplier. That
means Point Light and Spotlight are very much affected by the distance from an object, so it will take longer time
to adjust these two lights.
Lighting
V-RAY FOR RHINO
24
Rectangular Light Directional Light Point Light Spot Light
V-RAY FOR RHINO
HDRI
HRDI images are images that can be used to produce atmospheric lighting effect. HDRI
images contain additional information regarding illumination levels, in addition to color
values. You can learn more about HDRI images from the following websites.
http://en.wikipedia.org/wiki/High_dynamic_range_imaging
http://www.hdrmill.com/Freebies.htm
http://www.yboo.net/hdri/
Open the render options tab
Once in the render options window open the “Environment” tab
Double click the “M” next to GI (skylight)
From the Type menu select Bitmap.
Once you have selected Bitmap. Double click the “m” under the bitmap tab.
Choose an HDRI file from the Materials library HDRI folder or that you have downloaded.
24

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VRay 1.5 for rhino

  • 1. NEW YORK CITY COLLEGE OF TECHNOLOGY THE CITY UNIVERSITY OF NEW YORK V-RAY 1.5 FOR RHINO ARCHITECTURAL TECHNOLOGY DEPARTMENT written by Joseph Lim, Anne Leonhardt, Felix Rodriguez, with Dian Chen revised May 4, 2015 7:13 PM
  • 2. V-RAY FOR RHINO Table of Contents • Getting Started • V-Ray Render Options • Material Editor • Assigning Materials • Using Texture Mapping • Lighting 1 (1-2) (2-3) (4-9) (10) (11-23) (23-25)
  • 3. Getting Started V-Ray Render Options Clicking the tag with the “O” brings up the options box for V-Ray Render Options. 2 V-RAY FOR RHINO To get started, click on Render > Current Render > V-Ray. The Menu Bar will include V-Ray. Make sure that it is the current render. If it’s not, click it. You should see a toolbar for V-ray that looks like this: If you don’t see the toolbar for V-Ray, click on the toolbar menu, and put a checkbox next to “New V-Ray For Rhino”.
  • 4. DEFAULT SETTINGS The default preset options in V-Ray for Rhino are configured with relatively useful settings. Be careful not to adjust settings unintentionally. However, if you do and you want to change them back, in the options panel under V-Ray you can click on Load Defaults. In Render Options, V-Ray gives you the ability to adjust and manipulate the: • Global Switches, • System, • Camera, • Environment, • Image Sampler, • DMC sampler, • Color Mapping, • VFB channels, • Output, • Indirect Illumination(GI), • Irradiance Map, • Brute force GI, • Caustics, • Default displacement, • RTEngine. All these tabs open a section of adjustments according to your preference. V-RAY FOR RHINO 4
  • 5. DEFAULT SETTINGS 1. Global Switches Please uncheck Hidden Lights and Default Lights under the Lighting Section. We also recommend you check the low thread pirority under the Render section so that it won’t affect other program while rendering with V-Ray. 2, Environment Environment controls the contract, color, and HDR of the Global Illumination. -- Please check the boxes before GI and Background. -- Please adjust those three iterms then select the blue render icon on the top. All these tabs open a section of adjustments according to your preference. 3. Indirect Illumination Please check “On” under indirect illumination on. V-RAY FOR RHINO 3
  • 6. Material Editor Clicking the tag with “M” brings up the Material Editor box for V-Ray Render Options. V-RAY FOR RHINO 4 The materials workplace shows all the selected materials. Right clicking allows adding, importing, exporting, renam- ing, packing, removing, and selecting objects with cur- rent materials, such as assigning current materials to the selected objects or to the selected layers, deleting materi- als that are not used in the scene, and adding layers with reflections or refractions to the materials. Material Preview Options for material control. The optionn change with the added scene materials in section A. V-Rays’s Material Editor has three parts: 1. 2. 3.
  • 7. 5 Material: Diffuse Layer: The Diffuse Layer of a material applies a color to the material. The “M” box to the right applies pattern/textures and arranges sequences. Transparency adjusts the opacity. Black is completely opaque and white is completely transparent. Grays represent interme- diate levels of transparency. V-RAY FOR RHINO Material: Reflection Layer Click on the object you would like to add reflection to. Click on the Edit button under the Material selections in the Property palette. To add a reflection layer, click on the “+” next to the material under the Material Workspace to show all the layers. Right click on Reflection Layer. Select “Add new layer” to add a new reflection layer for this material. There will show Reflection under the material control section, as it shows on the right.
  • 8. V-RAY FOR RHINO 6 By default, a fresnel map is on the reflec- tion layer, which is typically good unless the objects is chrome or mirror. Fresnel Reflections are a naturally occurring phenomenon that states that an object be- comes more reflective the greater the angle at which it is seen. An example of this prin- ciple would be a window that is seen from straight ahead as opposed to at an angle. Through manipulating the Index of Refrac- tion (IOR) the reflective characteristics of an object can be changed. A lower IOR means that a larger angle is needed between the observer and the surface before the object begins to reflect. A higher IOR means that a smaller angle is needed, which in turn causes the object to reflect sooner. To have your renderings be more physically correct, it is recommended to have the IOR of an object correspond to its actual IOR.
  • 9. V-RAY FOR RHINO 7 Click on Reflection in the right section of the Material Editor and then click on the m box to set Reflection. The Text Editor box ap- pears. If it is not already enabled scroll down the box next to Type, and then select TexFresnel. IOR is to control the reflection intensity. The 1.55 default shows a slight amount of reflectivity, but chang- ing above 10 produces striking reflectivity. Chrome has an IOR between 8 and 20. Notice that the “m” on the right side of the Reflection in the Mate- rial Editor is now changed to “M”. This means the Map has some other characters associated with it now. Above are six rendered samples each with a different Fresnel IOR. The last one is rendered with full reflection to create a chrome material.
  • 10. V-RAY FOR RHINO 8 Reflection Glossiness You don’t always get clear reflection from reflec- tive material. Objects like matte finish metal, wood and some plastic materials do not re- flect the environment clearly due to it uneven surfaces. This is because the uneven surfaces create many reflecting angles for light to bounce around. So the highlight is not as sharp if com- pared to reflection from smoother surfaces. The best way to create this kind of rendering quality is playing around the setting of both Highlight Glossiness and Reflection Glossiness. The default value for both Reflection and High- light Glossiness is 1, which means that the reflections will be perfectly sharp. Once the value is decreased below 1 the reflections begin to become blurry. A value of 0 would mean that the reflections are completely blurred, and this would look similar to a material without a reflection layer at all. Setting this for regular materials would cause extremely long render times. A good range for creating glossy reflections is be- tween .5 and 1. At values below .5 the effect is similar to a material without reflections. Below are results from combinations of vari- ous intensities of Reflection Glossiness and Fresnel IOR.
  • 11. V-RAY FOR RHINO 9 Refraction Layer To add this layer, click on the “+” to the right of the Object, and then right click on Refraction Layers. Select Add new layer. You will see the Refraction layer added to the right of the window. In the Material Editor, Reflection box, you can adjust the degree of transparency (white gives 100% transparency and will not show the diffuse color). To apply color to a Refractive material, the Fog Color is used, located in the lower right of the Refraction dialog box. Click on the Fog Color and change it to the same color as the original Diffuse Color. Click on the Update Preview to confirm. Note: It is recommended to always have Affect Shadows (below the Fog Color) checked as it produces more realistic effects.
  • 12. V-RAY FOR RHINO 10 Assigning Materials To add new material there are 2 options: 1. Right click on Scene Material, select Create Material, then select Standard. 2. Right click on the Scene Material, select Load Material to load saved material file. V-Ray comes with its set of materials. To Load a Vray Material right click on Scene Material and Select Load Material. A window will open to locate the VRay material. VRay materials in school computers is found in Local Disk --> Program Data --> ASVGIS --> V-Ray Materials --> Vray mat --> vismat_material_collection. Note: V-Ray materials for at home computer will be under Local Disk --> Program Data --> ASVGIS --> V-Ray Materials
  • 13. Material editing To duplicate a material, change the name, remove, export, import or pack it, right click on the material and choose one of these options. Three other options for working with materials include: • Apply materials to objects. Any materials under the Scene Materials can be applied to objects by selecting an object/s prior to assinging the material. • Apply materials to layers. • Select objects by materials: Selects the objects in the scene having the material. Note: Undo will not undo changes in the material editor. Material application through Material Selection Material application through Layers
  • 14. V-RAY FOR RHINO 12 Using Texture Mapping Maps in V-Ray Image texture maps are applied to the diffuse layer of a material. Click on the ‘m’ next to the color box under the options panel of the diffuse panel.
  • 15. V-RAY FOR RHINO 13 The following box will appear. First, choose TexBitmap from the Type dropdown box on the left. Then make sure that the mapping is set to explicit map channel. The map chan- nel will be different for each layer of mapping you have, so make sure that you note the channel. It is time to choose the bitmap. Click on the ‘m’ next to file and choose your texture. Some textures can be tiled, others cannot. Choose tile only if the image is meant to be tiled.
  • 16. V-RAY FOR RHINO The following is a link to a tutorial for photoshop that shows you how to create a tile-able texture from a regular image: http://psd.tutsplus.com/tutorials/interface-tutorials/how-a-turn-a-texture-into-a-seamlessly-tiled-background/ 14 Mapping requires that we set how the images are placed on our objects. -- Open the properties box for your object in Rhino and choose Texture Mapping. -- Choose Custom Mapping
  • 17. V-RAY FOR RHINO Here is that channel again. Make sure it matches the channel for your texture. The projection is important for the way that the texture maps itself onto the object. The following page covers all of the various types of projection available. Depending on your choice for projection, you may need to rotate the texture to make it appear correctly. If you have designed a non-tiling map, you may need to size it to your object so that it does not tile. Click the Size to Objects button to stretch the texture to fit the object exactly. 15
  • 18. V-RAY FOR RHINO These images illustrate a planar mapping. Notice that the map is “flat” or co-planar with the x-y plane. This affects the way that the texture is applied. This image illustrates what happens when we rotate the texture map 90 degrees to “stand up” and be be coplanar with the x-z plane 16
  • 19. V-RAY FOR RHINO These images show the various types of mapping available, box, spherical, cylindrical, and planar. Bump Maps Bump maps are created using the grayscale of the Bitmap to set the high and low texture. The bright part of the Bit- map is considered as high part and the dark is low. The Bump map is seen more clearly at the part where the object reflects the most of the light. Using Bump map texture to create bumped texture is only a visual effect, not the true surface of the object. Look at the edge of the object and you will still see the smooth surface. 17
  • 20. V-RAY FOR RHINO To add a sense of texture, apply the same material with the Bump Map feature, which is found under the Map box in the Material Editor. Note***: Use the same settings for tiling and projection that you used for the texture map so that the tex- ture and bump map images align. (see section above). 18
  • 21. V-RAY FOR RHINO Displacement Displacement allows you to recreate the texture of a surface by using a black and white image to describe the varying height of the surface. This is very similar to how bump mapping works, but each method does this in a different way. Bump mapping simply shifts the surface according to the image applied to it, with- out actually changing the geometric structure of the surface. This causes bump mapping to be somewhat limited in its capabilities of representing those surfaces. Displacement on the other hand actually creates the geometry that is described by the image. This is done by subdividing a given piece of geometry and adjusting the individual heights of all of the faces based on the image that it is describing. The result is a surface that produces a much more accurate and realistic result. Adding Displacement Using displacement is very similar to using bump mapping. In fact, you can probably use your current bump maps as displacement maps. In the Maps rollout of the material options there will be an option for Displacement. Enable displacement by clicking the check box on the left, and then proceed to click on the “m” to add a displacement map. Although textures are used for displacement maps in most situations it is possible to add a displacement map via the procedural mapping. Once either a texture or procedural mapping is added there is one last thing that you will have to pay at- tention to while still in the texture editor, and that is the multiplier. The multiplier is what is actually going to determine the final size of the displacement this will reference the Amount value in the Displacement roll- out. Displacement Parameters In the V-Ray for Rhino Options there is a rollout which contains the parameters for displacement. It is im- portant to note that these are global controls for all of the displacement throughout the scene. Currently there is no individual controls on a per object or material level. This means that you must be aware of the settings within this rollout when adjusting an individual material’s displacement. 19
  • 22. V-RAY FOR RHINO The Amount value may possibly be the most important value within the rollout, as this value will determine the scale of all displacement. The Amount value is the number of scene units of an object with the texture multiplier set to 1. This means that one could adjust the affect of displacement through either the Amount value or the texture multiplier, but because the Amount value affects all displacement, it is recommended that it be left constant and the texture multiplier be used to adjust the displacement of an individual material. Both the Maximum Subdivisions and the Edge Length will affect the quality and speed of the displaced mesh. Maximum Subdivisions will control the amount of subdivided triangles that are allowed to be created from a single triangle of the original mesh. In general, it is better to have a slightly denser mesh and lower maximum subdivision rather than a simpler mesh and a higher maximum subdivision. Depending on density of the render mesh created by Rhino, the max subdivisions may not necessarily come into play. The edge length will determine the maximum length of a single triangle. By default this value is expressed in pixels, but if you disable View-Dependant then the edge length value will reference your scene units. Smaller values will lead to a higher quality, while larger values will decrease the quality. 20
  • 23. V-RAY FOR RHINO Adjusting Displacement Depending on how you set up your global displacement values you can set up your texture mul- tipliers in one of two ways. The first way, which is the simplest, is to keep the Amount value in the displacement options at 1 and to adjust the texture intensity as an expression of scene units. The plane on the left has a texture multiplier of .5, which in this case leads to a maximum displacement of .5 units. The plane on the left has a multiplier and maximum displacement of 2. 21
  • 24. V-RAY FOR RHINO Example 2 The image on the left is an example of the differ- ent quality settings for displacement. The plane on the left has an Edge Length of 24 pixels and a Maximum Subdivision of 6. The plane on the right has an Edge Length of 2 pixels and a Maxi- mum Subdivision of 512 22 Example 1 The second way to set up displacement by making the maximum displacement the Amount Value in the V-Ray options and setting the tex- ture multipliers as a percentage of that maximum value. It the case of the two planes to the right the Amount value is two. The plane on the left has a texture multiplier of .25 and the plane on the left has a multiplier of 1. You will notice that the rendered image is the same in both cases. That is because it is does not matter the method that is chose, only that the multipliers are in line with the desired effect
  • 25. V-RAY FOR RHINO Here is a comparison of bump mapping (left) and displacement (right). Both the maps and intensities are the same. As you can see the bump map is limited in its ability to create the depth that is capable with displacement. 23 Each light content is differen. Other than color, multiplier and shadow on/off, each also had subdivs for shadow quality control, Photon map for render quality control, Caustic subdivs control and Bias for shadow off set. The difference is only with Directional Light, Point Light and Spotlight which have the ability to adjust the radius of shadows. Point Light and Spotlight are the ones need to control the Decay itself: Linear, Inverse and Inverse Square. The last two Decay dramatically. So when using Inverse or Inverse Square, you must increase the multiplier. That means Point Light and Spotlight are very much affected by the distance from an object, so it will take longer time to adjust these two lights. Lighting
  • 26. V-RAY FOR RHINO 24 Rectangular Light Directional Light Point Light Spot Light
  • 27. V-RAY FOR RHINO HDRI HRDI images are images that can be used to produce atmospheric lighting effect. HDRI images contain additional information regarding illumination levels, in addition to color values. You can learn more about HDRI images from the following websites. http://en.wikipedia.org/wiki/High_dynamic_range_imaging http://www.hdrmill.com/Freebies.htm http://www.yboo.net/hdri/ Open the render options tab Once in the render options window open the “Environment” tab Double click the “M” next to GI (skylight) From the Type menu select Bitmap. Once you have selected Bitmap. Double click the “m” under the bitmap tab. Choose an HDRI file from the Materials library HDRI folder or that you have downloaded. 24