Hello, I got this code that draws a textured wall of a brick house glBegin(GL_QUADS); glTexCoord2f(0.0, 1.0); glVertex3f(x,y,z); // TL glTexCoord2f(0.0, 0.0); glVertex3f(x,y,z); // BL glTexCoord2f(1.0, 0.0); glVertex3f(x,y,z); // BR glTexCoord2f(1.0, 1.0); glVertex3f(x,y,z); // TR glEnd(); If I want to put a window or door in that wall defined by GL_QUADS, what woudl be the best way to do it. Another GL_QUADS,glScissor, or alpha testing? Thanks

Best would be not to hardcode it that way, but to write an object loader and model your wall, including doors and windows, in a 3D program.

Then you draw the triangles belonging to an object (which incidentially is a wall with a door or a window), and you need not care about all the 57 million special cases of walls with or without doors, floors with and without stairs going down, roofs, chimneys, or whatever objects happen to be in your world.

Write code once, model data in a tool.