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437(1): 02/02/10 06:30 ID:??? AAS
I'm having a hard problem in transforming a direction vector from
one coordinate space to the another.
I need to transform the direction of the ray from world space
to the object space so I can do an intersection on the triangles
in a mesh.

Thanks for any help

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440(4): [age] 02/02/10 08:32 ID:??? AAS
>>434
OpenGL, the most popular graphics library in the world, requires that z value in
homogeneous clipping space be within the range between -w and w, as is the case
with your platform. Historically, I believe, this type of projection matrices
rather than DirectX-style projection matrices (0 < z < w) has been widly used.

>>437
You can use the upper-left 3x3 matrix of your transform matrix (from world space
省7

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