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fglShadeModel(3G)	       OpenGL Reference		     fglShadeModel(3G)

NAME
     fglShadeModel - select flat or smooth shading

FORTRAN SPECIFICATION
     SUBROUTINE fglShadeModel( INTEGER*4 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
     fglBegin 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 Type of Polygon i   Vertex
		       ____________________________________
		       Single polygon (i = 1)	       1
		       Triangle strip		     i + 2
		       Triangle fan		     i + 2
		       Independent triangle	       3i
		       Quad strip		     2i + 2
		       Independent quad		       4i
		       ____________________________________

     Flat and smooth shading are specified by fglShadeModel 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.

									Page 1

fglShadeModel(3G)	       OpenGL Reference		     fglShadeModel(3G)

     GL_INVALID_OPERATION is generated if fglShadeModel is executed between
     the execution of fglBegin and the corresponding execution of fglEnd.

ASSOCIATED GETS
     fglGet with argument GL_SHADE_MODEL

SEE ALSO
     fglBegin, fglColor, fglLight, fglLightModel

									Page 2

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