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Texture Mapping Question

Started by discman1028 Aug 5, 2003 at 12:51 AM 2 replies 450+ views

Original Post

Aug 5, 2003 at 12:51 AM

Hi all. When I dont use LoadGLTextures(), my texture-mapped triangle strips (particles from particle engine) show up as squares, and a not-texture-mapped quad (or a ground surface) show up as a square. This is fine and I understand why. What I do not understand is why when I use LoadGLTextures(), my particles get mapped with a texture (that''s good), but my quad disappears completely. (That''s bad) I have tried many things. Commenting out glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); brings back my quad, but I obviously lose my particle texture mapping then, too. This is probably a beginner''s question; so be it. THANKS A TON, -awesome site nehe!- --== discman1028 ==--

davepermen

160

davepermen

Aug 5, 2003 at 9:09 AM

disable texturing after drawing the quads? (glDisable(GL_TEXTURE_2D) ?)

"take a look around" - limp bizkit
www.google.com

Krohm

346

Krohm

Aug 5, 2003 at 12:09 PM

Particles. Uhm. I guess you got a texture which is transparent at the edges and then you got a non textured quad.
Is texturing disabled before texturing the quad?
If you do not, what will happen is that all the quad vertices will get the same texcoord and it turns out that, very probably, this texcoord maps to RGBA (?,?,?,0) (where ''?'' means "don''t care"). This is because the texcoord will be something like ST (1,1), referring to the particle texture, which I guess has transparent borders.

discman1028

Author

discman1028

Aug 5, 2003 at 2:06 PM

You are absolutely right. Adding "glDisable(GL_TEXTURE_2D);" before my quad and "glEnable(GL_TEXTURE_2D);" aftrwards, I get the solid surface and the transparent textured particles. THANKS!

Also what works instead, is right at the center of the texture it is bright white, so saying "glTexCoord2d(0.5,0.5);" right before drawing the quad makes it visible. "glTexCoord2d(0.75,0.75);" makes it slightly less visibale cuz the texture fades toward the edges.

Great and THANKS!!

Will return to offer help and ask for it.

--== discman1028 ==--

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