GLFRUSTUM - Online Linux Manual PageSection : 3G
NAME"glFrustum − multiply the current matrix by a perspective matrix
C SPECIFICATIONvoid glFrustum( GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val )
PARAMETERSleft, right  Specify the coordinates for the left and right vertical clipping planes. bottom, top  Specify the coordinates for the bottom and top horizontal clipping planes. near_val, far_val  Specify the distances to the near and far depth clipping planes. Both distances must be positive.
DESCRIPTION­glFrustum describes a perspective matrix that produces a perspective projection. The current matrix (see ­glMatrixMode) is multiplied by this matrix and the result replaces the current matrix, as if ­glMultMatrix were called with the following matrix as its argument:
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