displacepolygon(3G)					   displacepolygon(3G)

NAME    [Toc]    [Back]

     displacepolygon - specifies a displacement	for the	z values of rendered
     polygons

C SPECIFICATION    [Toc]    [Back]

     void displacepolygon(float	scalefactor)

DESCRIPTION    [Toc]    [Back]

     displacepolygon offsets the z values of rendered pixels for polygons.
     The term scalefactor*max(abs(dz/dx),abs(dz/dy)) is	added to the z values
     of	rendered pixels, where dz/dx and dz/dy are the slopes of the triangle
     in	window coordinates.  scalefactor is a signed float value.
     displacepolygon is	effectively disabled by	setting	scalefactor to 0.0,
     which is the default.

     displacepolygon is	recommended when rendering a z buffer that is later
     defined (see texdef) as a texture for generating shadows.	It can also be
     used to offset polygons so	that lines drawn around	their borders do not
     intersect them.  This technique can be used to support hidden line
     drawing and outlined facets.

NOTES    [Toc]    [Back]

     IRIS-4D G,	GT, GTX, VGX, and VGXT models and the Personal Iris do not
     support this function.

SEE ALSO    [Toc]    [Back]

     texdef


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