glPolygonOffset man page on DigitalUNIX

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glPolygonOffset(3G)					   glPolygonOffset(3G)

NAME
       glPolygonOffset	- set the scale and units used to calculate depth val‐
       ues

SYNOPSIS
       void glPolygonOffset(
	       GLfloat factor,
	       GLfloat units );

PARAMETERS
       Specifies a scale factor that is used to create a variable depth offset
       for  each polygon.  The initial value is 0.  Is multiplied by an imple‐
       mentation-specific value to create a constant depth offset. The initial
       value is 0.

DESCRIPTION
       When GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFF‐
       SET_POINT is enabled, each fragment's depth value will be offset	 after
       it  is  interpolated from the depth values of the appropriate vertices.
       The value of the offset is factor * DZ + r * units, where DZ is a  mea‐
       surement	 of  the  change  in  depth relative to the screen area of the
       polygon, and r is the smallest value that is guaranteed	to  produce  a
       resolvable  offset  for	a  given  implementation.  The offset is added
       before the depth test is performed and before the value is written into
       the depth buffer.

       glPolygonOffset()  is  useful  for  rendering  hidden-line  images, for
       applying decals to surfaces, and for rendering solids with  highlighted
       edges.

NOTES
       glPolygonOffset()  is  available	 only  if  the	GL  version  is 1.1 or
       greater.

       glPolygonOffset() has no effect on  depth  coordinates  placed  in  the
       feedback buffer.

       glPolygonOffset() has no effect on selection.

ERRORS
       GL_INVALID_OPERATION  is	 generated  if	glPolygonOffset()  is executed
       between the execution of glBegin() and the corresponding	 execution  of
       glEnd().

ASSOCIATED GETS
       glIsEnabled()  with  argument  GL_POLYGON_OFFSET_FILL,  GL_POLYGON_OFF‐
       SET_LINE, or GL_POLYGON_OFFSET_POINT.

       glGet()	with  argument	GL_POLYGON_OFFSET_FACTOR  or   GL_POLYGON_OFF‐
       SET_UNITS.

SEE ALSO
       glDepthFunc(3), glEnable(3), glGet(3), glIsEnabled(3)

							   glPolygonOffset(3G)
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