glGetMaterial man page on RedHat
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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 © 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 03/16/2013 GLGETMATERIAL(3G)
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