| 3D projective geometry |
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| These concepts
generalize naturally to 3D |
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| • | Homogeneous
coordinates |
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| – | Projective 3D
points have four coords: P =
(X,Y,Z,W) |
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| • | Duality |
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| – | A plane N
is also represented by a 4-vector |
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| – | Points and planes
are dual in 3D: N P=0 |
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| • | Projective
transformations |
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| – | Represented
by 4x4 matrices T: P’ =
TP, N’ = N T-1 |
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