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Legacy talk:T3D Brush

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I'm trying to parse a T3D file and render a wireframe using Java. Nearly there I think.

However, I'm a little unsure about the Yaw/Pitch/Rotation matrices that are described on this page.

1. Why are they 4x4 matrices, and not 3x3 as one would expect?

2. Reading [1], the matrices starting with formula 48 look correct, but differ from those on this page (other than problem 1).

Any explanation on this would be most appreciated.