Inward-pointing Normal Vector?

[kingcu]

 Hi,

I know this is weird. I have some problem with the direction of the normal. I know it should be pointing outward; however, when I try to disply a 3D unit cube made of 6 polygons, for each polygon, I have to set the normal to point toward the inside of the cube to get the proper color. Otherwise, if I use the regular outward-pointing normals, everything is black. I am assuming the x-y-z coordinate is a right-hand coordinate system, with positive x point to the right hand side of the screen, positive y point upward and positive z pointing out the screen; also, I am specifying the vertices in a counter clockwise order if looking from the outside.

I am using JOGL. And here are what I did:

1. Enable depth test;
2. Enable lighting;
3. Enable light0;
4. Set light properties (ambient, etc);
5. Set the material properties;
6. Enable GL_NORMALIZE;

I didn't touch either the projection matrix or the modalview matrix.

Any one has any idea how this could be?

Thank you,
wt

[Vage]

I think you posted in the wrong forum 

This is OpenAL, not OpenGL...