Hi everyone, Here''s my problem, right now my OpenGL landscape terrain (advanced version of a heightmap) is multitextured with 2 texture units, one for detail texture using texture matrix scaling (like how DigiBen does it on GameTutorials) and one for a precomputed shadow map based on the "Fast computation of terrain shadow maps" paper by Mircea Marghidanu I want the approach DigiBen uses for one large texture stretched overtop of the terrain, I had that on one of the texture units, but the shadowing took priority When I draw the landscape I currently specify the texture coordinates for both texture units with: glMultiTexCoord2fARB(GL_TEXTURE0_ARB, u, v); glMultiTexCoord2fARB(GL_TEXTURE1_ARB, u, v); followed by the vertex I obviously need to render another texture pass for the large texture map, but how do I do it? I tried something like: Bind Shadow Texture Bind Detail Texture Render World() Bind Map Texture Render World() But that didn''t seem to work =/ Also, I had vertex arrays working, but I had to revert back to per vertex gl calls because I couldn''t figure out how to multitexture with it, I had a normals, vertices, and texture coordinate array all bound and everything and the world was drawing but only one texture would ever bind? Thanks in advance! Graham

Here is some sample of my code, on how to use multitexturing with vertex arrays.

glEnableClientState(GL_VERTEX_ARRAY);
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture_cache[ground_detail_text].texture_id);
glActiveTextureARB(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
glClientActiveTextureARB(GL_TEXTURE1_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2,GL_FLOAT,0,clouds_uv);
glClientActiveTextureARB(GL_TEXTURE0_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2,GL_FLOAT,0,array_uv_main);

Height Map Editor | Eternal Lands | Fast User Directory

Awesome thank you for that, that solved one of my problems (and will give me back my huge performance gain again

Any idea how to do the extra pass I guess for the 3rd texture though?

Thanks,

Graham

You add the 3rd texture the same as you add the second texture,
only that you use glClientActiveTextureARB(GL_TEXTURE2_ARB); instead of glClientActiveTextureARB(GL_TEXTURE1_ARB);
Of course, you might want to check first if the video card supports more than 1 (or 2) texture units. If it doesn''t, either print an error message, or do an extra pass.

Height Map Editor | Eternal Lands | Fast User Directory

Ya, that''s what I was thinking, but that''s my question, how do I do the 2nd pass? I tried it but didn''t seem to want to work.

Btw, I get some nice results using your heightmap editor

http://studentweb.nait.ab.ca/cst1766/Exodus/Images/Screenshots/Landscape2.jpg

I''m still tweaking things but I LOVE how well the mountain peek coloring turned out

I''d love to get that 3rd texture mapped onto it though hehe

Thanks a lot!

~Graham

Bad Monkey, you don''t need to worry about the Z buffer, if you use multitexturing for your passes.

gwihlidal, please be more specific, I don''t exactly understand your question.


Height Map Editor | Eternal Lands | Fast User Directory

Thank you both for your help,

k, here''s the updated situation

I tried glDepthFunc(GL_EQUAL) just to try everything I could and everything disappeared, so I tried GL_LEQUAL and for some odd reason the 3rd texture actually appears now when I make the 2nd pass?! Anyone able to plz explain what was happening?

It all draws now, having some issues with all the blending and combines everything is either super dark or super bright but I guess I just have to try different parameters for each texture unit =/

Thanks a lot!

~Graham

Yes, by default, the multitexturing thing is useful for lightmaps, you have to use an extension if you want to actually combine the colors nicely.
text_env_add is the extension, I guess (never used it, I use the multitexturings in my game only to make the clouds on the ground/objects).


Height Map Editor | Eternal Lands | Fast User Directory