I was reading thru the tutorials at http://www.markmorley.com/opengl/frustumculling.html for view frustum culling and i have some doubt. Whats "MODELVIEW" glGetFloatv( GL_MODELVIEW_MATRIX, modl ); being described in the tutorial or whatz its equivalent in directx ? thanks a lot in advance... Slow and steady wins the race.

Direct3D uses 3 main matrices for transformation*:

1. WORLD - the transformation from local object ("model") space into world space.

2. VIEW - the transformation from world space into camera/view space.

3. PROJECTION - the transformation from view space into homogenous clip space.


OpenGL uses 2 matrices:

1. MODELVIEW - the transformation from object ("model") space into camera/view space.

2. PROJECTION - as above.


So you should be able to guess that MODELVIEW is simply:

MODELVIEW = WORLD * VIEW


* D3D actually generates a few other matrices internally from the 3 you supply. There isn''t any direct way to get at those though

--
Simon O''Connor
Creative Asylum Ltd
www.creative-asylum.com