Is gl_LightSource.position transformed?

OpenGL
1

Hello,

if I do:
glPushMatrix();
glMulMatrix(mat);
glLight ( GL_POSITION,0,0,0);
glPopMatrix();

will gl_LightSource.Position be transformed?

2

Yes, the light position is transformed by the modelview matrix in which you perform the call. See http://opengl.org/sdk/docs/man/xhtml/glLight.xml . :slight_smile:

3

well, I’ve got a problem then.
nVidia’s implementation returns transformed coordinates, but with ATI cards, gl_LightSource[0].position is NOT transformed by the modelview.

4

According to the spec it should be transformed so I’m guessing it’s a bug with the ATI drivers.

5

For me ATI Drivers did Transform the coordniates. But you have to make shure that your w coordinate of the Light position is 1 otherwise it is treated as an directional light source.

6

I think this was recently fixed by AMD/ATI.

7

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