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3D Drawing discusses different types of perspective drawing techniques and ellipses. There are three main types of perspective drawing: one-point, two-point, and three-point perspective. One-point perspective uses a single vanishing point, two-point uses two vanishing points, and three-point perspective adds complexity with three vanishing points. An ellipse is a circle viewed in perspective, so it follows the same properties as a circle but appears elongated.
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Similar to 3D perspective autocad.
Compare the differences and uniqueness between Isometric, Oblique, an.pdf
Compare the differences and uniqueness between Isometric, Oblique, and Perspective views.
Please explain why CAD becomes the most important and fundamental tool in modern design
and Manufacturing as well as in product development.
Solution
Isometric views
Oblique views
Perspective views
An isometric view represents an object in three dimensions with exact dimensional
representation.
Here the 3 sides of the object are drawn with all the vertical lines being vertically but all
horizontal lines at 30 degree to the base line (x-axis line)
All the three coordinate axes appear equally foreshortened and the angle between any two of
them is 120 degrees
In Isometric drawings, object are drawn with all its 3 planes parallel to projection planes and all
the lines/edges are parallel to its respective foreshortened axes (30 degree axis) and can also be
measured.
All the lines/edges are drawn to the full length scale rather than reducing them to the true
projection length.
Oblique view also represents an object in the 3D format.
But here the objects are drawn with the most distinguishing features facing directly towards the
observer, showing the true shape of these features. E.g. Circular features like round holes are
drawn on this front face as true circles.
Oblique view will always show the object as being perfectly flat with respect to the picture plane
(i.e., that particular face of the object will have only two dimensions from the viewer\'s point of
view).
Oblique view shows one face with distinguishing feature of the object in true shape, but the other
faces with foreshorten depth.
It is quite a simple technique compared to isometric or even perspective drawing as the only the
face with distinguishing feature has to be drawn to the scale.
Perspective views also represent an object in the 3D format with approximate representation.
The lines/edges of an object seem to meet at a point over a distance. This point is called the
vanishing point.
Here the vertical lines remain vertical, horizontal lines remain horizontal but the line that
represents the depth of the object (3rd Dimension lines) are drawn converging on to this
vanishing point.
The depth lines are to be drawn from the vanishing point to the sides of the drawing paper as
guide lines.
Objects in a perspective drawing all the lines/edges are subject to foreshortening. The size of the
object is drawn smaller as their distance from the observer increases. As their distance from the
observer decreases they are drawn larger.
Isometric views
Oblique views
Perspective views
An isometric view represents an object in three dimensions with exact dimensional
representation.
Here the 3 sides of the object are drawn with all the vertical lines being vertically but all
horizontal lines at 30 degree to the base line (x-axis line)
All the three coordinate axes appear equally foreshortened and the angle between any two of
them is 120 degrees
In Isometric drawings, object are drawn with all its 3 planes parallel.
Transcription howtodrawperspective
This document provides an introduction to perspective in drawing. It discusses key elements of perspective like the horizon line, which represents the viewer's eye level, and vanishing points, where converging lines disappear to create the illusion of depth. It explains the difference between one-point, two-point, and three-point perspective. Two-point perspective, with two vanishing points located on the horizon line, is covered in detail. The document demonstrates how perspective makes drawings appear more three-dimensional and realistic compared to flat drawings without it. It provides guidance on setting up vanishing points to avoid distorted drawings and concludes by demonstrating a basic exercise in applying perspective to spheres.
BASIC-DRAFTING.pptx
The document discusses different types of technical drawings used in drafting and engineering. It defines isometric drawings as a type of axonometric projection where the three axes are equally foreshortened at 120 degree angles, allowing a 3D object to be represented in 2D. It also discusses orthographic projections using parallel lines orthogonal to the view plane, and oblique projections which are not perfectly scaled but can represent 3D objects clearly. Drafting tools like pencils, rulers, compasses and T-squares are used to precisely draw different views and measurements to engineering specifications.
Week 3 Polygonal Modelling
This document provides an overview of polygonal modelling techniques used in 3D computer graphics. It discusses how polygon meshes are constructed using vertices, edges, and faces. Common operations for constructing meshes like box modelling and extrusion modelling are described. Refining models by manipulating individual vertices is also covered. The document emphasizes the importance of using reference materials when building 3D models.
Isometric projection
it gives you the some usefull information of drawing of isometric projection and also about orthographic projection
Technical drawing introduction
This document provides guidance on technical drawing specifications and conventions for VCE Visual Communication Design studies. It outlines different types of technical drawings including paraline drawings like isometric and planometric, perspective drawings, orthographic drawings, and architectural drawings. It describes key techniques for these different drawing types, such as how to draw ellipses and place views in orthographic drawings. The document is intended as a resource for students to support the technical drawing components of their VCE studies and assessments.
Technical drawing specifications
This document provides guidance on technical drawing specifications and conventions for VCE Visual Communication Design studies. It outlines different types of technical drawings including paraline drawings like isometric and planometric, perspective drawings, orthographic drawings, and architectural drawings. It describes key techniques for these different drawing types, such as how to draw ellipses and place views in orthographic drawings. The document is intended as a resource to support students in learning technical drawing skills and applying appropriate conventions.
Isometric and Orthographic Drawing Powerpoint.pptx
The document discusses orthographic and isometric drawings. It explains that orthographic drawings use multiple 2D views to represent a 3D object, including top, bottom, front, back, right and left views. Isometric drawings represent 3D objects at a skewed angle using 3 main rules: horizontal edges are drawn at 30 degrees, vertical edges are drawn vertically, and parallel edges appear parallel. The document provides examples of an isometric cube drawing and instructions for setting up a drawing board and techniques for drawing orthographic and isometric views, including using scales. It assigns two tasks: drawing a cube and smaller scaled cube with a cutout.
Twopoint
Two-point perspective can be used to draw objects from different angles, with one vanishing point for each set of parallel lines. It allows for more viewing points than one-point perspective. The document provides examples of boxes drawn in two-point perspective, with the vanishing points placed in different positions, sometimes within and sometimes outside the picture plane. It also includes student drawings applying two-point perspective to architectural subjects, with feedback on effective and less effective uses of techniques like ink wash, details, and complex spaces.
Basic sketching
This document provides an overview of different types of sketches used in the design process and basic sketching techniques. It discusses ideation sketches, exploratory sketches, explanatory sketches, and persuasive sketches. It emphasizes that sketching is an important skill for designers to communicate ideas, and that practice is required to develop this skill. The document then covers basic skills like drawing straight lines and parallel lines as warm-up exercises. It introduces two-point perspective and provides a step-by-step example of how to apply it when sketching a basic house. The goal is to help students improve their sketching and visualization abilities.
DRAFTING TECHNOLOGY - G-8.pptx
This document outlines a presentation about drafting technology. It defines key drafting terms and identifies important drafting materials and tools, including different types of drawing pencils. It also explains different types of lines used in technical drawings like visible, hidden, and dimension lines. The document provides activities for students to identify words related to drafting and complete an orthographic drawing with three standard views.
mechanical engineering drawing
This document provides information about mechanical engineering drawing including:
1. It outlines the syllabus for the ME 1200 Mechanical Engineering Drawing course which covers topics like orthographic projection, oblique projection, isometric projection, and descriptive geometry.
2. It describes the purpose and types of technical drawings including pictorial drawings, orthographic drawings, and dimensioning drawings. Common drawing elements like lines, dimensions, and notes are explained.
3. Guidelines are provided for reading drawings including understanding different line types, placement of views, and handling drawings properly. Instrument requirements are also listed.
14773 chapter 07
Orthographic projections are a method for conveying the shape and size of engineered objects using 2D drawings. They involve taking views of an object from the front, top, and side with parallel projecting rays. Lines and areas in the views represent edges, surfaces, and intersections between surfaces of the 3D object. Sectional views use a cutting plane to reveal internal features that would otherwise be hidden. They distinguish cut areas, which are hatched, from open areas cut through by the sectioning plane. Orthographic projections and sections effectively communicate 3D geometric information through 2D drawings.
First and third angle projection
The document discusses different types of technical drawings used in civil engineering. It describes third angle and first angle projections, which differ in how top, front and side views of an object are arranged relative to each other on a page. It also covers conventions for indicating hidden lines, center lines, and the order drawings should be made. Dimensioning techniques like transferring measurements between views are explained. The document concludes by briefly discussing freehand sketching and physical modeling.
Ed ass 2013
The document discusses different types of engineering drawings and projections used in engineering communication. It covers orthographic projections, which use multi-view 2D drawings to represent 3D objects. It also discusses pictorial projections like isometric, oblique, and perspective projections which use a single-view representation. The document outlines the different types of lines used in engineering drawings like visible, hidden, center lines. It provides examples of isometric, oblique and perspective projections and their applications in engineering drawings.
PICTORIAL DRAWING.pptx
The document discusses different types of pictorial drawings used in technical drafting. It begins by stating the objectives of the lesson which are to define pictorial drawing, identify the three main types, and appreciate their importance. The three main types are then described in detail: isometric drawings show three dimensions at full scale using 30 degree angles, oblique projections preserve sizes of parallel faces but distort others, and perspective drawings provide a view similar to human vision using one, two, or three vanishing points. Pictorial drawings are important for communication between designers and producers as well as providing accurate visualizations of projects.
Class 8 presentation
This document provides information about the 2D Essentials class including test scores, the course calendar, project details, and content covered in chapters 6 and 7 such as orthographic sketching conventions, section views, and common manufactured features. It outlines techniques for visualizing and drawing complex cylindrical shapes and features like fillets, rounds, and holes. Groups practiced applying various drawing conventions. The next topics will cover orthographic sketching and common features shown in views. Homework includes reading the rest of chapter 3 and answering review questions.
Technical drawing I
This document discusses engineering drawings and orthographic projections. It explains that engineering drawings specify the precise size and shape of parts through dimensions and tolerances, rather than illustrating objects. Orthographic projections show objects from multiple views, like the front, side, and top, to accurately depict the object's geometry. These views are drawn looking straight on to each face of the object so dimensions are not distorted, unlike perspective projections. The document provides an example of an L-shape depicted through an orthographic first angle projection, with views from the front, side, and top.
Contour line
This document provides examples and guidance on using contour line drawing techniques. It discusses how contour drawing uses varied line thickness instead of shading to define shape and form. Several masterworks are shown that demonstrate effective use of thick and thin lines to depict shadows, surfaces, and details. The document emphasizes using harder or softer pencils and pressure to vary line darkness. It also stresses the importance of strong composition, such as following the rule of thirds, in contour line drawings.
Projections and views
Orthographic projection is a method of visualizing different views of an object from its sides, such as top, front, and side views. These views are drawn on paper to help manufacturing. The most common views are the front, top, and right side. Dimensions and notes are added. Objects have six principle views projected inside an imaginary glass box. Three view drawings are most common and arranged with the front view first, then top and right side views projected from the front.
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3D perspective autocad.
- 1. 3D Drawing Perspective Drawing and Ellipsis
- 2. 3D DRAWING A 3 dimensional shape, object or thing you draw upon a piece of paper that shows you the perspective and shading used to help make the drawing more realistic.
- 3. Perspective Drawing Perspective drawing is used in many different fields. Engineers or industrial design engineers will draw using an isometric grid to give a fixed perspective. They may draw the different parts or draw an entire building.
- 4. ONE-POINT perspective drawing. This type of perspective drawing is based on one focal point or vanishing point. In these types of drawing one will notice that most all lines will meet at exactly one point. This is the point of infinity. TWO POINT perspective is just what it sounds like. Instead of only one point of infinity there are two. Take a look at this castle wall.
- 5. THREE-POINT perspective is a bit more involved. The constructions are the same as one and two point but with three vanishing points. With three points it can get a little confusing. Take a look at this GSP file of two boxes with three-point perspective.
- 6. Ellipsis An ellipse is simply a circle seen in perspective. This is an important concept to keep in mind. An ellipse, therefore, must conform to the same rules as a circle - it consists of arcs, it contains no straight lines and, if divided into quarters, each segment is identical to the other three.