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#1
February 9th, 2003, 03:28 AM
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OpenGL issues
I am really getting
 on this... I am doing some fun with opengl. At least trying to. My problem is: - when i only translate the MODELVIEW matrix, the lights keep static and the room is lit depending on where i am standing. like as if i was carrying a flashlight with me. - when i translate the PROJECTION matrix instead, the whole output starts shearing and some polygons are clipped unnecessarily. - when i mix both, i get the same result as with only using PROJECTION matrix. I´ve read quite many tutorials and books, but could not find a clue what causes this behaviour...  Anyone here got some experience with OpenGL and lighting? My renderer looks like this: Code:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef(Tilt, 1, 0, 0);
glRotatef(Heading, 0, 1, 0);
glTranslatef(myPosition.X, myPosition.Y, myPosition.Z);
for (....) {
... call all renderlists...
}
The lights are setup only once in my Init() function. I tried to re-setup them in the rendering function, but this would require me to do the vector math to find their position depending on heading,tilt and my position. I doubt this is necessary for OpenGL lighting. Everything else was so easy up to now  Any ideas?
__________________
-- Manuel Hirsch - Linux, FreeBSD, programming, administration articles, tutorials and more.
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#2
February 9th, 2003, 08:19 AM
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Got it solved.
The concepts of OpenGL are just as whacked as the rest of the programming world
 I actually do have to move the lights against the direction that my camera is moving. No idea why they don´t correspond to polygons in that way as i have to redraw polygons in each frame, but lights not ... Sadly, my framerate dropped from constant 400-410/sec to varying between 160 and 360. Ok, i´m out optimizing this now 
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#4
February 17th, 2003, 01:06 PM
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Gladly I got the lights issues solved. The drop in framerate was due to a part of the code where was so frustrated that i did reset the lights on each frame and re-setup them then. Seems like the initialization of the lights takes some time. A varying time on my radeon...
Only had a short glance at the page: "DirectX .x model loader" - exactly what i need for my next step Are you also using OpenGL? Thanks for the link. M.
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