1GLGETMATERIAL(3G) OpenGL Manual GLGETMATERIAL(3G)
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6 glGetMaterial - return material parameters
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9 void glGetMaterialfv(GLenum face, GLenum pname, GLfloat * params);
10 void glGetMaterialiv(GLenum face, GLenum pname, GLint * params);
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14 face
15 Specifies which of the two materials is being queried. GL_FRONT or
16 GL_BACK are accepted, representing the front and back materials,
17 respectively.
18 pname
20 Specifies the material parameter to return. GL_AMBIENT,
21 GL_DIFFUSE, GL_SPECULAR, GL_EMISSION, GL_SHININESS, and
22 GL_COLOR_INDEXES are accepted.
23 params
25 Returns the requested data.
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28 glGetMaterial returns in params the value or values of parameter pname
29 of material face. Six parameters are defined:
30 GL_AMBIENT
32 params returns four integer or floating-point values representing
33 the ambient reflectance of the material. Integer values, when
34 requested, are linearly mapped from the internal floating-point
35 representation such that 1.0 maps to the most positive
36 representable integer value, and -1.0 maps to the most negative
37 representable integer value. If the internal value is outside the
38 range -1 1, the corresponding integer return value is undefined.
39 The initial value is (0.2, 0.2, 0.2, 1.0)
40 GL_DIFFUSE
42 params returns four integer or floating-point values representing
43 the diffuse reflectance of the material. Integer values, when
44 requested, are linearly mapped from the internal floating-point
45 representation such that 1.0 maps to the most positive
46 representable integer value, and -1.0 maps to the most negative
47 representable integer value. If the internal value is outside the
48 range -1 1, the corresponding integer return value is undefined.
49 The initial value is (0.8, 0.8, 0.8, 1.0).
50 GL_SPECULAR
52 params returns four integer or floating-point values representing
53 the specular reflectance of the material. Integer values, when
54 requested, are linearly mapped from the internal floating-point
55 representation such that 1.0 maps to the most positive
56 representable integer value, and -1.0 maps to the most negative
57 representable integer value. If the internal value is outside the
58 range -1 1, the corresponding integer return value is undefined.
59 The initial value is (0, 0, 0, 1).
60 GL_EMISSION
62 params returns four integer or floating-point values representing
63 the emitted light intensity of the material. Integer values, when
64 requested, are linearly mapped from the internal floating-point
65 representation such that 1.0 maps to the most positive
66 representable integer value, and -1.0 maps to the most negative
67 representable integer value. If the internal value is outside the
68 range -1 1, the corresponding integer return value is undefined.
69 The initial value is (0, 0, 0, 1).
70 GL_SHININESS
72 params returns one integer or floating-point value representing the
73 specular exponent of the material. Integer values, when requested,
74 are computed by rounding the internal floating-point value to the
75 nearest integer value. The initial value is 0.
76 GL_COLOR_INDEXES
78 params returns three integer or floating-point values representing
79 the ambient, diffuse, and specular indices of the material. These
80 indices are used only for color index lighting. (All the other
81 parameters are used only for RGBA lighting.) Integer values, when
82 requested, are computed by rounding the internal floating-point
83 values to the nearest integer values.
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86 If an error is generated, no change is made to the contents of params.
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89 GL_INVALID_ENUM is generated if face or pname is not an accepted value.
90 GL_INVALID_OPERATION is generated if glGetMaterial is executed between
92 the execution of glBegin() and the corresponding execution of glEnd().
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95 glMaterial()
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98 Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
99 under the SGI Free Software B License. For details, see
100 http://oss.sgi.com/projects/FreeB/.
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103 opengl.org
104opengl.org 06/10/2014 GLGETMATERIAL(3G)