glPolygonOffset man page on SunOS

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GLPOLYGONOFFSET(3gl)					  GLPOLYGONOFFSET(3gl)

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

C SPECIFICATION
       void glPolygonOffset( GLfloat factor,
			     GLfloat units )

PARAMETERS
       factor  Specifies a scale factor that is	 used  to  create  a  variable
	       depth offset for each polygon. The initial value is 0.

       units   Is  multiplied  by an implementation-specific value to create a
	       constant depth offset. The initial value is 0.

DESCRIPTION
       When GL_POLYGON_OFFSET is enabled, each fragment's depth value will  be
       offset  after it is interpolated from the depth values of the appropri‐
       ate vertices.  The value of the offset is factor*DZ+r*units,  where  DZ
       is  a measurement 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 apply‐
       ing 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 feed‐
       back 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, glDisable, glEnable, glGet, glIsEnabled, glLineWidth, glS‐
       tencilOp, glTexEnv

				   15 Mar 97		  GLPOLYGONOFFSET(3gl)
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