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Texture-Mapping not working
Author
I am trying to just display a texture on a simple quad.
I am using 24bit TGA loading code from my heightmap renderer, which works fine, so I don''t think that could be my problem.
I looked at NeHe''s tutorials, and I initialized my textures the same as far as I can tell.
I did glEnable(GL_TEXTURE_2D).
I bind the texture and I assigned the texture coords to vertices and everything. But all it does is display an untextured quad.
What could be the problem? I''ve tested it on different machines, with a variety of 3d cards, and some without any cards.
Thanks,
Jonathan
Well, from what you''ve told me I can''t say exactly, but here''s a couple of suggestions you can take to find out what''s going wrong:
* If you''re sure your TGA loader is fine, ignore this first one, but if not, try dumping the raw image info to a file to check it.
* Check for an error after calling glTexImage2d (or gluBuild2dMipmaps - if you''re using that), because if you specify a bad value for components or format then it won''t work.
* Check you''ve got the right amount (this sounds silly) of corresponding glTexCooord calls to glVertex...
* Check you''ve actually bound the texture!
If the cube looks grey, then it''s probably glTexImage.
Post your code so I know what''s happening...
========
Smidge
smidge@smidge-tech.co.uk
* If you''re sure your TGA loader is fine, ignore this first one, but if not, try dumping the raw image info to a file to check it.
* Check for an error after calling glTexImage2d (or gluBuild2dMipmaps - if you''re using that), because if you specify a bad value for components or format then it won''t work.
* Check you''ve got the right amount (this sounds silly) of corresponding glTexCooord calls to glVertex...
* Check you''ve actually bound the texture!
If the cube looks grey, then it''s probably glTexImage.
Post your code so I know what''s happening...
========
Smidge
smidge@smidge-tech.co.uk
Author
I decided to try using the code from NeHe''s tutorial to load a BMP. I made sure everything I had was the same, it was. Yet it still didnt work!
The only difference I can think of is that I am using GLUT.
Could this make a difference? Is there something different you have to do in GLUT for texturing?
The only difference I can think of is that I am using GLUT.
Could this make a difference? Is there something different you have to do in GLUT for texturing?
Author
Okay, I ended up solving my own problem!
After re-doing my TGA loading and rendering code about 5 times each, I finally got it working!
I am not still not entirely certain, but I believe it was not displaying a texture because I was missing this:
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
If so, then I wasted an entire day re-writing code for nothing!
Well, I guess it was quite a learning experience if nothing else.
Now I have a texture-mapped 3d landscape!
After re-doing my TGA loading and rendering code about 5 times each, I finally got it working!
I am not still not entirely certain, but I believe it was not displaying a texture because I was missing this:
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
If so, then I wasted an entire day re-writing code for nothing!
Well, I guess it was quite a learning experience if nothing else.
Now I have a texture-mapped 3d landscape!
This topic is closed to new replies.
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