[PyOpenGL-Users] Modelview and projection matrices

[Jan E. <ch...@in...>]

Hi,

I've been trying to implement some form of view frustum culling. I found
some interesting code on:

	http://www.markmorley.com/opengl/frustumculling.html

The code is in C, so I need to translate it to Python. Central in that
approach is the use the current modelview and projection matrices. So I
get the using:

        projection = glGetFloatv ( GL_PROJECTION_MATRIX )
        modelview  = glGetFloatv ( GL_MODELVIEW_MATRIX )

However, the Python versions return a [4][4] matrix, while the C versions
return a [16] array. The code on the page above uses a [16] array for all
indexing, so I'd like to translate the matrices I get from glGetFloatv to
arrays.

The problem is now that I'm not sure how the returned matrix should be
"flattened". Should I go by row or column, i.e. the first element in the
array should be [0][0], but should the second be [0][1] or [1][0] and so
on?

I have tried both ways, but my code still won't work, so I'd like to rule
out at least this possibility for error. Ny ideas?

	Chakie

-- 
 The Emperor had all the qualifications for a corpse except, as it were, the
         most vital one.
                                       -- Terry Pratchett, Interesting Times