RE: More on: OGL View Matrix --> pfChan view matrix
Clay Stanek (stanek++at++mrcsb.com)
12 Jun 98 13:33:51 -0700
A lucid reference for this on the mathematical side can be found in
"Linear Algebra
And Its Applications" by Gilbert Strang; HBJ Publishers. Chapter 3, p.
283 (3rd edition)
Angus Dorbie wrote:
>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.
>
A lucid reference for
this on the mathematical side can be found
in "Linear Algebra
And Its Applications"
by Gilbert Strang; HBJ Publishers. Chapter
3, p. 283 (3rd edition)
Angus
Dorbie wrote:
>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.
>
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