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Introduction
Notes on computer graphics, an early love of mine since I played with the HP9830 Plotter ROM and flatbed plotter in 1975 doing 2D and 3D graphics.
Contents
@@3D Graphics
Summary: The "holy grail" of computer graphics has been realistic portrayal of 3D objects.
In increasing order of complexity:
- 2D graphics
- Parallel Projection - x goes across, z goes up, y goes up in a diagonal
- Orthographic Projection - project object straight onto viewing plane. All you have to do is rotate the object to get different views. Compute sin and cos for rotations once, and do a matrix multiply, or sometimes faster to just write out all computations
- Perspective Projection - Use the same rotation as orthographics, but divide by the Z distance to get distance shrinking.
- Wire frame - Connect points with straight lines. No lines are hidden, things appear as if they are made of hollow wires.
- Polygon - Fill in spaces between polygon vertex. If rendered from back-to-front, this will hide the "hidden" faces.
- Curve
- Texture Mapping
Articles
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· Drawing an Image as a 3-D Surface By Darryl Bryk | 4 Jun 2011
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