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+_C_ License Applicability. Except to the extent portions of this file are
+_C_ made subject to an alternative license as permitted in the SGI Free
+_C_ Software License B, Version 1.1 (the "License"), the contents of this
+_C_ file are subject only to the provisions of the License. You may not use
+_C_ this file except in compliance with the License. You may obtain a copy
+_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+_C_ 
+_C_ http://oss.sgi.com/projects/FreeB
+_C_ 
+_C_ Note that, as provided in the License, the Software is distributed on an
+_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+_C_ 
+_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
+_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+_C_ Copyright in any portions created by third parties is as indicated
+_C_ elsewhere herein. All Rights Reserved.
+_C_ 
+_C_ Additional Notice Provisions: The application programming interfaces
+_C_ established by SGI in conjunction with the Original Code are The
+_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
+_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
+_C_ published by SGI, but has not been independently verified as being
+_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
+_C_
+_C_ The first character in this file must be an '_'!
+_C_ Anything on a line after _C_ is ignored
+_define(_filters,eqn)_C_
+_C_      eqn is automatically replaced with neqn for nroff
+_header(GetMaterial,return material parameters)
+_names(GetMaterial,[fi]v)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies which of the two materials is being queried.
+_const(FRONT) or _const(BACK) are accepted,
+representing the front and back materials, respectively.
+_phead(_param2)
+Specifies the material parameter to return.
+_const(AMBIENT),
+_const(DIFFUSE),
+_const(SPECULAR),
+_const(EMISSION), 
+_const(SHININESS), and
+_const(COLOR_INDEXES)
+are accepted.
+_phead(_param3)
+Returns the requested data.
+.SH DESCRIPTION
+_cmnd returns in _param3 the value or values of parameter _param2
+of material _param1. Six parameters are defined:
+.TP 22
+_const(AMBIENT)
+_param3 returns four integer or floating-point values representing the
+ambient reflectance of the material.
+Integer values,
+when requested,
+are linearly mapped from the internal floating-point representation
+such that 1.0 maps to the most positive representable integer value,
+and \-1.0 maps to the most negative representable integer value.
+If the internal value is outside the range [\-1, 1],
+the corresponding integer return value is undefined. The initial value is
+(0.2, 0.2, 0.2, 1.0)
+.TP
+_const(DIFFUSE)
+_param3 returns four integer or floating-point values representing the
+diffuse reflectance of the material.
+Integer values,
+when requested,
+are linearly mapped from the internal floating-point representation
+such that 1.0 maps to the most positive representable integer value,
+and \-1.0 maps to the most negative representable integer value.
+If the internal value is outside the range [\-1, 1],
+the corresponding integer return value is undefined. The initial value is
+(0.8, 0.8, 0.8, 1.0).
+.TP
+_const(SPECULAR)
+_param3 returns four integer or floating-point values representing the
+specular reflectance of the material.
+Integer values,
+when requested,
+are linearly mapped from the internal floating-point representation
+such that 1.0 maps to the most positive representable integer value,
+and \-1.0 maps to the most negative representable integer value.
+If the internal value is outside the range [\-1, 1],
+the corresponding integer return value is undefined. The initial value is
+(0, 0, 0, 1).
+.TP
+_const(EMISSION)
+_param3 returns four integer or floating-point values representing the
+emitted light intensity of the material.
+Integer values,
+when requested,
+are linearly mapped from the internal floating-point representation
+such that 1.0 maps to the most positive representable integer value,
+and \-1.0 maps to the most negative representable integer value.
+If the internal value is outside the range [\-1, 1.0],
+the corresponding integer return value is undefined. The initial value is
+(0, 0, 0, 1). 
+.TP
+_const(SHININESS)
+_param3 returns one integer or floating-point value representing the
+specular exponent of the material.
+Integer values,
+when requested,
+are computed by rounding the internal floating-point value to the
+nearest integer value. The initial value is 0. 
+.TP
+_const(COLOR_INDEXES)
+_param3 returns three integer or floating-point values representing the
+ambient, diffuse, and specular indices of the material.
+These indices are used only for color index lighting.
+(All the other parameters are used only for RGBA lighting.)
+Integer values,
+when requested,
+are computed by rounding the internal floating-point values to the
+nearest integer values.
+.SH NOTES
+If an error is generated,
+no change is made to the contents of _param3.
+.SH ERRORS
+_const(INVALID_ENUM) is generated if _param1 or _param2 is not an
+accepted value.
+.P
+_const(INVALID_OPERATION) is generated if _cmnd
+is executed between the execution of _cmnd(Begin)
+and the corresponding execution of _cmnd(End).
+.SH SEE ALSO
+_cmnd(Material)