OpenGL and messed up detail map

eric · Post by **eric** » Sat Mar 10, 2007 10:54 pm

... trying to find a solution for my latest problem with OPENGL, I noticed that the issue was brought up already in march 2006 by etcaptor:

http://irrlicht.sourceforge.net/phpBB2/ ... detail+map
(the page includes a picture of what is going on here).

it is mainly about the fact that using a quake3map and a terrain with detail map together, shows the detail map to be completely messed up. setting the LIGHTING to true for the bsp eliminates the problem for the detail map, but this way you cannot really use the bsps' lightmaps.

so far I did not manage to find any answers. I wonder if the problem has been solved in the meantime and I just missed that particular solution page in the forum.

any help? any ideas ?

eric, GY

hybrid · Post by **hybrid** » Sat Mar 10, 2007 11:22 pm

I thought that these things were already fixed with 1.2, but in latest SVN a combination of terrain scene node and Quake mesh with light maps does work. Which version of Irrlicht do you use?

eric · Post by **eric** » Sun Mar 11, 2007 7:52 am

I'm using Ver 1.2 and can definitely confirm that the problem is not fixed in 1.2. I downloaded the SVN, but so far I didn't have a chance to see if this particular problem maybe is already fixed. I was too busy trying to adapt some nice forum features like CloudScene and WaterReflection, realizing that they do no longer work with the latest SVN because of some major changes in the matrix4 and in the setPixelShaderConstant concept etc. But I will run my app, using the newly compiled SVN Dll to see if the bsp-detail problem is solved.

thanks for the reply

regards, eric GY

eric · Post by **eric** » Sun Mar 11, 2007 8:29 am

I used the SVN Dll on my app. I cannot confirm that the problem is solved. the detail map in combination with the bsp still appears messed up, when using OPENGL. I hate to say: even worse, now if you apply only one texture on the terrain, the one texture is messed up in the same way the detail map usually shows messed up. that at least was not a problem under 1.2. by the way: the terrain collision seemingly doesn't work properly (or may differently?) with the SVN version ...

eric, BY

eric · Post by **eric** » Sun Mar 11, 2007 6:45 pm

ok, just in case someone is running into the same problem and looking for a solution. I just did, what etcaptor suggested: I took

// lightmap ---------------------------------------------------------------
Driver->extGlActiveTextureARB(GL_TEXTURE1_ARB);

glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_EXT);

glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_EXT, GL_MODULATE );
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_EXT, GL_TEXTURE );
glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_EXT, GL_TEXTURE );

if (material.MaterialType == EMT_LIGHTMAP_ADD)
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_ADD);
else
glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_EXT, GL_MODULATE);

glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_EXT, GL_PREVIOUS_EXT);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_EXT, GL_SRC_COLOR);

glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB_EXT, GL_TEXTURE);
glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB_EXT, GL_SRC_COLOR);

if (material.MaterialType == EMT_LIGHTMAP_M4)
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 4.0f);
else
if (material.MaterialType == EMT_LIGHTMAP_M2)
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 2.0f);
else
glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_EXT, 1.0f);

------------------------------------------------------------

pasted it into class COpenGLMaterialRenderer_DETAIL_MAP, right between diffuse map and detail map, recompiled the DLL and it worked. The problem is solved (at least for me).

thank you etcaptor.

regards, eric GY