glPolygonOffset man page on Oracle
[printable version]
GLPOLYGONOFFSET(3G) OpenGL Manual GLPOLYGONOFFSET(3G)
NAME
glPolygonOffset - set the scale and units used to calculate depth
values
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_FILL, GL_POLYGON_OFFSET_LINE, or
GL_POLYGON_OFFSET_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 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
applying decals to surfaces, and for rendering solids with highlighted
edges.
ASSOCIATED GETS
glIsEnabled() with argument GL_POLYGON_OFFSET_FILL,
GL_POLYGON_OFFSET_LINE, or GL_POLYGON_OFFSET_POINT.
glGet() with argument GL_POLYGON_OFFSET_FACTOR or
GL_POLYGON_OFFSET_UNITS.
SEE ALSO
glDepthFunc(), glEnable(), glGet(), glIsEnabled()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLPOLYGONOFFSET(3G)
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