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Why doesn't the Source engine clear the back buffer?

In the Source engine, when the map does not have a sky box, I see that typical artifact from the back buffer not being cleared. Why does the Source engine do that? Is it a performance reason, or ...
RenX's user avatar
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How do I calculate the points of a brush from a Source engine VMF? [closed]

I'm trying to render the brushes from a Source engine .vmf file in C++, using OpenGL. The .vmf stores solid brushes as a series ...
Chris528's user avatar