GLGETMATERIAL(3G)						   OpenGL Manual						 GLGETMATERIAL(3G)

NAME

       glGetMaterial - return material parameters

C SPECIFICATION

       void glGetMaterialfv(GLenum face, GLenum pname, GLfloat * params);

       void glGetMaterialiv(GLenum face, GLenum pname, GLint * params);

PARAMETERS

       face
	   Specifies which of the two materials is being queried.  GL_FRONT or GL_BACK are accepted, representing the front and back materials,
	   respectively.

       pname
	   Specifies the material parameter to return.	GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_EMISSION, GL_SHININESS, and GL_COLOR_INDEXES are
	   accepted.

       params
	   Returns the requested data.

DESCRIPTION

       glGetMaterial returns in params the value or values of parameter pname of material face. Six parameters are defined:

       GL_AMBIENT
	   params 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)

       GL_DIFFUSE
	   params 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).

       GL_SPECULAR
	   params 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).

       GL_EMISSION
	   params 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, the
	   corresponding integer return value is undefined. The initial value is (0, 0, 0, 1).

       GL_SHININESS
	   params 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.

       GL_COLOR_INDEXES
	   params 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.

NOTES

       If an error is generated, no change is made to the contents of params.

ERRORS

       GL_INVALID_ENUM is generated if face or pname is not an accepted value.

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

SEE ALSO

       glMaterial()

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							 GLGETMATERIAL(3G)