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GLSHADEMODEL(3G)			  OpenGL Manual 			 GLSHADEMODEL(3G)

NAME
       glShadeModel - select flat or smooth shading

C SPECIFICATION
       void glShadeModel(GLenum mode);

PARAMETERS
       mode
	   Specifies a symbolic value representing a shading technique. Accepted values are
	   GL_FLAT and GL_SMOOTH. The initial value is GL_SMOOTH.

DESCRIPTION
       GL primitives can have either flat or smooth shading. Smooth shading, the default, causes
       the computed colors of vertices to be interpolated as the primitive is rasterized,
       typically assigning different colors to each resulting pixel fragment. Flat shading
       selects the computed color of just one vertex and assigns it to all the pixel fragments
       generated by rasterizing a single primitive. In either case, the computed color of a
       vertex is the result of lighting if lighting is enabled, or it is the current color at the
       time the vertex was specified if lighting is disabled.

       Flat and smooth shading are indistinguishable for points. Starting when glBegin() is
       issued and counting vertices and primitives from 1, the GL gives each flat-shaded line
       segment i the computed color of vertex i + 1, its second vertex. Counting similarly from
       1, the GL gives each flat-shaded polygon the computed color of the vertex listed in the
       following table. This is the last vertex to specify the polygon in all cases except single
       polygons, where the first vertex specifies the flat-shaded color.

       +-----------------------------------+-----------------------------------+
       |				   |				       |
       |			Primitive  |			      Vertex   |
       |Type of Polygon 		   |				       |
       |			i	   |				       |
       |				   |				       |
       +-----------------------------------+-----------------------------------+
       |Single polygon			   |		     1		       |
       |			(	   |				       |
       |				   |				       |
       |				   |				       |
       |				i  |				       |
       |				== |				       |
       |				1  |				       |
       |				   |				       |
       |			)	   |				       |
       +-----------------------------------+-----------------------------------+
       |Triangle strip			   | i				       |
       |				   |				     + |
       |				   |				     2 |
       +-----------------------------------+-----------------------------------+
       |Triangle fan			   | i				       |
       |				   |				     + |
       |				   |				     2 |
       +-----------------------------------+-----------------------------------+
       |Independent triangle		   | 3				       |
       |				   |				       |
       |				   |				     i |
       +-----------------------------------+-----------------------------------+
       |Quad strip			   | 2				       |
       |				   |				       |
       |				   |				     i |
       |				   |				     + |
       |				   |				     2 |
       +-----------------------------------+-----------------------------------+
       |Independent quad		   | 4				       |
       |				   |				       |
       |				   |				     i |
       +-----------------------------------+-----------------------------------+

       Flat and smooth shading are specified by glShadeModel with mode set to GL_FLAT and
       GL_SMOOTH, respectively.

ERRORS
       GL_INVALID_ENUM is generated if mode is any value other than GL_FLAT or GL_SMOOTH.

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

ASSOCIATED GETS
       glGet() with argument GL_SHADE_MODEL

SEE ALSO
       glBegin(), glColor(), glLight(), glLightModel()

COPYRIGHT
       Copyright (C) 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				    06/10/2014				 GLSHADEMODEL(3G)
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