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== Why doesn't glClear() work for areas outside the scissor rectangle? ==

The OpenGL Specification states that glClear() only clears the scissor rectangle when the scissor test is enabled. If you want to clear the entire window, use the code:

<pre>  glDisable (GL_SCISSOR_TEST);
  glClear (...);
  glEnable (GL_SCISSOR_TEST);</pre>

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