[osg-users] Scale problem while transforming object in vertex shader

[Sebastian Messerschmidt]

Hi Yura
> Hi,
>
> I have a transform matrix and I want to apply it in shader. I pass it into uniform and set gl_Position = gl_ModelViewProjectionMatrix*my_transfrom_matrix*gl_Vertex.
> If I set translate only, everything is ok. If I set translate and scale - translate multiplies by scale and transform is wrong (object is too far if scale>1.0). If I apply this transform not using shader (by SetMatrix) everything is ok. What I am doing wrong?
Matrix multiplication is not cummutative in every case.
Try
gl_Position = gl_ModelViewMatrix * matrix * gl_ProjectionMatrix * 
gl_Vertex.

Cheers
Sebastian
>
>
> Thank you!
>
> Cheers,
> Yura
>
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> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=70768#70768
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