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Texture Blending
Author
I know that it''s possible to blend colors on a polygon (set each vertice to a different color) but can you do the same thing with textures? How?
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Blue*Omega
(Insert Witty Quote Here)
Here''s a cheap method for OpenGL. I''m not saying it works but it could. It does involve multipass texturing, so you need to know how to do that..
I''m not sure if this would work, or result in having a transparent center. If it does make the center semi-transparent, you could modify the first pass to have alpha 1.0 on all values. That would probably work right.. however, this method is extremely slow (triple pass texturing!).
If you''re working on a software engine, it should be fairly simple to modify your texture mapper to interpolate color values from different texture sources, especially if you''re already using bilinear filtering (they could both be implemented in the same algorithm).
-RWarden (roberte@maui.net)
// setup(enable blending, multipass texturing)// triangle, first pass(set texture to first vertex''s texture)(draw vertex 1, alpha 1.0)(draw vertex 2, alpha 0.0)(draw vertex 3, alpha 0.0)// triangle, second pass(set texture to second vertex''s texture)(draw vertex 1, alpha 0.0)(draw vertex 2, alpha 1.0)(draw vertex 3, alpha 0.0)// triangle, third pass(set texture to third vertex''s textures)(draw vertex 1, alpha 0.0)(draw vertex 2, alpha 0.0)(draw vertex 3, alpha 1.0) I''m not sure if this would work, or result in having a transparent center. If it does make the center semi-transparent, you could modify the first pass to have alpha 1.0 on all values. That would probably work right.. however, this method is extremely slow (triple pass texturing!).
If you''re working on a software engine, it should be fairly simple to modify your texture mapper to interpolate color values from different texture sources, especially if you''re already using bilinear filtering (they could both be implemented in the same algorithm).
-RWarden (roberte@maui.net)
Author
Well... I tried the above method and it worked fine but... what a preformance hit! That TRIPLES the polys evry frame! More if you use quads.
any other suggestions... Please...
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Blue*Omega
(Insert Witty Quote Here)
any other suggestions... Please... -----------------------------
Blue*Omega
(Insert Witty Quote Here)
Hi Blue*Omega,
I wonder why u need to blend color when u use a Texture.
If it''s for blend the lighting to the poly, use normal at each vertex.
Elseway tell me why u need to do this, i will try to help you !!
LowRad
I wonder why u need to blend color when u use a Texture.
If it''s for blend the lighting to the poly, use normal at each vertex.
Elseway tell me why u need to do this, i will try to help you !!
LowRad
Author
Im trying to do a landscape texturemap and interpolate textures according to height. (did that make sense?) I could do a Huge texturemap and get all the little details I want but... that would take loads of memory. Anyways, I know about normals and shading and color blending and such, I just want to know how to do it with texture maps.
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Blue*Omega
(Insert Witty Quote Here)
Anyways, I know about normals and shading and color blending and such, I just want to know how to do it with texture maps. -----------------------------
Blue*Omega
(Insert Witty Quote Here)
ya it''s possible and pretty easy. let me make sure know what effect you''re trying to get. blending as in alpha blending?
glEnable(GL_BLEND);
glBlendFunc(...);
yada yada
for a glass or transparency effect? or actually mixing the textures?
JoeMont001@aol.com
www.polarisoft.n3.net
glEnable(GL_BLEND);
glBlendFunc(...);
yada yada
for a glass or transparency effect? or actually mixing the textures?
JoeMont001@aol.com
www.polarisoft.n3.net
Author
No, sorry if I haven''t been to clear, but I know how to do transparency and the like. I want to MIX textures.
crappy ASCII example:
texture 1 texture 2
\ /
*---------*
| /
| /
| / texture 1 = grass;
| / texture 2 = sand;
| / texture 3 = rock;
| /
| /
| /
|/
* - texture 3
I want the textures to sort of "fade" into each other. Can it be done without overlapping triangles? sorry for the confusion.
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Blue*Omega
(Insert Witty Quote Here)
crappy ASCII example:
texture 1 texture 2
\ /
*---------*
| /
| /
| / texture 1 = grass;
| / texture 2 = sand;
| / texture 3 = rock;
| /
| /
| /
|/
* - texture 3
I want the textures to sort of "fade" into each other. Can it be done without overlapping triangles? sorry for the confusion.
-----------------------------
Blue*Omega
(Insert Witty Quote Here)
Author
aww shoot! The stupid message board screwed up my ascii triangle!
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Blue*Omega
(Insert Witty Quote Here)
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Blue*Omega
(Insert Witty Quote Here)
This is in no way related to your problem, but you can use
to draw with spaces.<br><br><pre><br>|----------/<br>| /<br>| /<br>| /<br>| /<br>| /<br>| /<br>| /<br>| /<br>| /<br>|/<br> </pre> <br><br>EL <br><br>----------------------------------------<br>"Inash neteia haeg joa kavari quilm..." SD4
the only way i can see ( i''ld like to hear others ) is to use a plain grass texture and blend the rocks over it using an alpha channel on the rocks. ive tried to use just a plain grass texture a plain rocks texture and another bw texture to specify the blending of the 2 previous textures but i haven''t as yet been able to find a fast way
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