Clipping in 3D Graphics Pipeline

1
Clipping in 3D Graphics Pipeline
3D World Geometry
ModelingTransform
Trivial Accept/Reject
View Transform (parallel or perspective)
Lighting
Division by W (maps to 2D)
Mapping to Viewport
Rasterization 2D clipping
3D clipping
If we do the trivial reject before the
perspective transform, we dont need to
transform vertices and lines that would be
clipped out. We can do more 3D clipping after
the perspective transform because it is faster
and simpler to clip against a canonical view
volume.
Screen
From page 867 of Foley and van Dam