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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)