displacepolygon(3G)

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

C SPECIFICATION
     void displacepolygon(float scalefactor)

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

SEE ALSO
     texdef