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Problems with simple Heightmap

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Hi, I''m encountering strange problems with heightmapping. I read in a file (reading is correct) and then draw it with this code: glBegin (GL_QUADS); for (int mapy=0; mapy<(HEIGHTMAP_WIDTH-1); mapy++) { for (int mapx=0; mapx<(HEIGHTMAP_HEIGHT-1); mapx++) { glTexCoord2f (0.0f, 0.0f); glVertex3i ((mapx) ,Heightmap[mapx+(mapy*HEIGHTMAP_WIDTH)] ,mapy); glTexCoord2f (1.0f, 0.0f); glVertex3i ((mapx)+1,Heightmap[mapx+1+(mapy*HEIGHTMAP_WIDTH)] ,mapy); glTexCoord2f (1.0f, 1.0f); glVertex3i ((mapx)+1,Heightmap[mapx+1+((mapy+1)*HEIGHTMAP_WIDTH)],(mapy)+1); glTexCoord2f (0.0f, 1.0f); glVertex3i ((mapx) ,Heightmap[mapx+((mapy+1)*HEIGHTMAP_WIDTH)] ,(mapy)+1); } } glEnd(); The problem is, that i don''t get quads or my terrain, i get pyramids. To explain look at this screenshot. The height map was a simple quad (the pyramid-wood at the left and some stuff down there (pyramid-holes). I can''t figure out what''s the problem. Please help since I must have this Engine ready for 1st september. Thanks, StryX

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I think you must use TRIANGLE_STRIPS..
this will be faster..

you need an array of vertices...
and draw this with glDrawElements();

good luck();

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