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Rotation

Started by pr0teus Jan 10, 2001 at 9:18 PM 2 replies 650+ views

Original Post

Jan 10, 2001 at 9:18 PM

Hey, I know two pieces of information. The vertices of my triangles and their normals. How, then, using this data, can I find the rotation values necessary to rotate vector A (0, 0, 1) so that it points in the same direction as vector B (the normal)? Thanks in advance, Ben

LilBudyWizer

Jan 11, 2001 at 10:30 AM

If A and B are unit vectors then the dot product of A and B is the cosine of the angle between them. It is actually the magnitude of A times the magnitude of B times the cosines of the angle between them, but the magnitudes are one for unit vectors.

pr0teus

Jan 11, 2001 at 11:45 AM

I know the dot product is the angle between them. But that doesn''t tell me what the rotations were that made the normal face that way. (ie, is the rotation on the x axis? y axis? a combination of x and z?)

Ben

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