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# Counterclockwise - Easy but confusing?!

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hi all! I am trying to draw a simple cube made from quads which is going to be a skybox. I want all quads to be rendered counterclockwise! Question which really confuses me - looking at the cube from outside we can see a front face which at the same time could be our back face (behind the viewer) if we were inside the cube. The cube as I mentioned is going to be a skybox, so the camera will be all the time inside the cube. Now.. should I draw the quad counterclockwise from inside which ie: 0.0, 0.0 0.0, 1.0 1.0, 1.0 1.0, 0.0 which looks from outside as we're drawing it clockwise or draw it counterclockwise from outside ie. 0.0, 0.0 1.0, 0.0 1.0, 1.0 0.0, 1.0 which looks form inside as we're drawing it clockwise. Drawing a quad counterclockwise from inside will give the impression looking at it from outside as it is drawn clockwise and the other way round if we were outside of the cube! so, how should I draw it? Edited by - robert_s on September 4, 2001 8:48:18 PM Edited by - robert_s on September 4, 2001 8:49:25 PM

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The solution is simple: YOU decide first if you want to see your cube from inside (thats the case for skyboxes) or from outside. This will define the vertex order. So simply think from where your primitives are to be seen and set the vertices ccw.
The reason for this step is that the GPU already rejects primitives that face away from the user and hence saves much time in processing them.

- thomas

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