More on: OGL View Matrix --> pfChan view matrix

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 12 Jun 1998 12:57:35 -0700

More on model matrix inversion to viewing matrix.

If anyone out there is curious about why transposing the
model matrix worked instead of inverting the viewing matrix
on the earlier thread (I got some questions) it's because
they are equivalent operations for an orthogonal (I think
that's the term) matrix.

Note that the purpose was not to switch the row-column
order due to some difference between the matrix storage
in Performer & OpenGL, the purpose was to invert the
matrix to switch from viewing matrix (which OpenGL modelview
matrix stack uses) to modelling matrix which a Performer
channel to use.

Thanks to Don Hatch for clearing this up.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux 


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/
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