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# 3D to 2D - PowerPoint PPT Presentation

3D to 2D. Orthographic Projection Delineation Techniques Clipping Plane Methodology. Graphical Representation. The vast majority is 2D representation of 3D objects Technical Documentation – Construction Documents, basic communication with peers

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## PowerPoint Slideshow about ' 3D to 2D' - julie-avery

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### 3D to 2D

Orthographic Projection

Delineation Techniques

Clipping Plane Methodology

• The vast majority is 2D representation of 3D objects

• Technical Documentation – Construction Documents, basic communication with peers

• 3D conception –> 2D representation –> 3D realization

• Computer Models can be “photographed” – images and line drawings can be generated much faster than can be drawn

• A means of representing a three-dimensional (3D) object in two dimensions (2D)

• A perspective projection with a hypothetical viewpoint—e.g., one where the camera lies an infinite distance away from the object and has an infinite focal length, or "zoom". (parallel projection)

• Multi-view Orthographic Projection

• Axonometric Orthographic Projection

Non-Orthographic (Perspective)

Orthographic

• Each projection plane is parallel to one of the coordinate axes of the object resulting in visual distortion / abstraction

• Also called plan view. a drawing made to scale to represent the top view or a horizontal section of a structure

• A representation of an object as it would appear if cut by a plane, showing its internal structure.

• A drawing or design that represents an object or structure as being projected geometrically on a vertical plane parallel to one of its sides.

• Axonometric

• A skewed Orthographic Projection so that multiple sides are visible at once

• a three-dimensional object is represented by a drawing having all axes drawn to exact scale, resulting in the optical distortion of diagonals and curves

• Trimetric – arbitrary foreshortening

• Isometric

• a three-dimensional object is represented by a drawing having the horizontal edges of the object drawn usually at a 30° angle and all verticals projected perpendicularly from a horizontal base, all lines being drawn to scale

• Uses Orthographic Cameras – Relatively Universal

• Extracts from solids or surfaces alike

• Uses two planes perpendicular to the focal length of the camera – Near Clipping Plane and Far Clipping Plane

• Only displays graphical information between the near clip and the far clipping plane

• The clipping plane method can be used in conjunction with the plot to file method. Plotting to file allows three important options in a single method –

• Allows rendering – allows the use of hidden line projection to “hide” lines that should be obscured with planes in 3D space.

• Flattens the drawing – gets rid of the Z dimension and flattens the 3D model to a 2D vector drawing

• Separates the line drawings – Drawings can be edited in respect to themselves without adversely altering the model

• Import the 3D model

• Page Setup Manager for a real-scale vector file

• Set up the layout for the desired view

• View

• Scale

• Use clipping planes to “cut”

• Use hidden line rendering on the viewport

• Plot to file

• Import plotted file into a [new] drawing

• Make it pretty

• Poche

• Entourage

• Line weight

• 3 datasets to manage

• Original model file

• Multiple layouts preferably – one for each “view”

• Vector files (DXB)

• Individual plot files with extensions that are not .dwg.

• These are not opened, but imported

• The Presentation file

• All vector files are imported here for cleanup and delineation