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  Inward-pointing Normal Vector?  (Read 2281 times)
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Offline kingcu

Junior Newbie

« Posted 2005-11-18 02:49:32 »


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;

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

Any one has any idea how this could be?

Thank you,
Offline Vage

Senior Newbie


« Reply #1 - Posted 2005-11-20 00:23:14 »

I think you posted in the wrong forum  Grin

This is OpenAL, not OpenGL...

Personally, you could strap me into a mech cockpit with 47 virtual HUD displays, two complex hand controls and foot pedals and I'd be grinning like the gamer freak I am.
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