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What is the difference of the "D3DXVECTOR4" and "D3DXVECTOR3"

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I''m not a DX user, but just from the names, I''d say D3DXVECTOR4 is a 4 element vector, and D3DXVECTOR3 is a 3 element vector. A 3 element vector typically is (x,y,z), while a 4 element vector typically has (x,y,z,w); or in the case of colors, (r,g,b) vs. (r,g,b,a).

For 3D math, transformations involving translation require a w coordinate (implicitly set to 1 in a 3 element vector) for correct matrix multiplication with a 4x4 matrix.


Golem
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