define the scissor box
Specify the lower left corner of the scissor box. Initially (0, 0).
glScissor defines a rectangle, called the scissor box, in window coordinates. The first two arguments, x and y , specify the lower left corner of the box. width and height specify the width and height of the box.
To enable and disable the scissor test, call glEnable and glDisable with argument GL_SCISSOR_TEST . The test is initially disabled. While the test is enabled, only pixels that lie within the scissor box can be modified by drawing commands. Window coordinates have integer values at the shared corners of frame buffer pixels.
glScissor(0,0,1,1)allows modification of only the lower left pixel in the window, and
glScissor(0,0,0,0)doesn't allow modification of any pixels in the window.
When the scissor test is disabled, it is as though the scissor box includes the entire window.
Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/ .
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.