chipheo

03-09-2001, 09:16 AM

Hello everyone,

Is there anyway we can get the inverse matrix of the model view matrix in OpenGL efficiently? Of course, we could get that matrix by glGetDoublev(GL_MODELVIEW_MATRIX,m) and then compute the inverse of m manually, but it's way too long since internally, I think, OpenGL must use the inverse to transform normal vectors.

Any help would be greatly appreciated.

Chip

Is there anyway we can get the inverse matrix of the model view matrix in OpenGL efficiently? Of course, we could get that matrix by glGetDoublev(GL_MODELVIEW_MATRIX,m) and then compute the inverse of m manually, but it's way too long since internally, I think, OpenGL must use the inverse to transform normal vectors.

Any help would be greatly appreciated.

Chip