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glcolormaterial(3g) [xfree86 man page]

GLCOLORMATERIAL(3G)													       GLCOLORMATERIAL(3G)

NAME
glColorMaterial - cause a material color to track the current color C SPECIFICATION
void glColorMaterial( GLenum face, GLenum mode ) PARAMETERS
face Specifies whether front, back, or both front and back material parameters should track the current color. Accepted values are GL_FRONT, GL_BACK, and GL_FRONT_AND_BACK. The initial value is GL_FRONT_AND_BACK. mode Specifies which of several material parameters track the current color. Accepted values are GL_EMISSION, GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, and GL_AMBIENT_AND_DIFFUSE. The initial value is GL_AMBIENT_AND_DIFFUSE. DESCRIPTION
glColorMaterial specifies which material parameters track the current color. When GL_COLOR_MATERIAL is enabled, the material parameter or parameters specified by mode, of the material or materials specified by face, track the current color at all times. To enable and disable GL_COLOR_MATERIAL, call glEnable and glDisable with argument GL_COLOR_MATERIAL. GL_COLOR_MATERIAL is initially dis- abled. NOTES
glColorMaterial makes it possible to change a subset of material parameters for each vertex using only the glColor command, without calling glMaterial. If only such a subset of parameters is to be specified for each vertex, calling glColorMaterial is preferable to calling glMaterial. Call glColorMaterial before enabling GL_COLOR_MATERIAL. Calling glDrawElements, glDrawArrays, or glDrawRangeElements may leave the current color indeterminate, if the color array is enabled. If glColorMaterial is enabled while the current color is indeterminate, the lighting material state specified by face and mode is also inde- terminate. If the GL version is 1.1 or greater, and GL_COLOR_MATERIAL is enabled, evaluated color values affect the results of the lighting equation as if the current color were being modified, but no change is made to the tracking lighting parameter of the current color. ERRORS
GL_INVALID_ENUM is generated if face or mode is not an accepted value. GL_INVALID_OPERATION is generated if glColorMaterial is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS
glIsEnabled with argument GL_COLOR_MATERIAL glGet with argument GL_COLOR_MATERIAL_PARAMETER glGet with argument GL_COLOR_MATERIAL_FACE SEE ALSO
glColor(3G), glColorPointer(3G), glDrawArrays(3G), glDrawElements(3G), glDrawRangeElements(3G), glEnable(3G), glLight(3G), glLightModel(3G), glMaterial(3G) GLCOLORMATERIAL(3G)

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GLMATERIAL(3G)							   OpenGL Manual						    GLMATERIAL(3G)

NAME
glMaterial - specify material parameters for the lighting model C SPECIFICATION
void glMaterialf(GLenum face, GLenum pname, GLfloat param); void glMateriali(GLenum face, GLenum pname, GLint param); PARAMETERS
face Specifies which face or faces are being updated. Must be one of GL_FRONT, GL_BACK, or GL_FRONT_AND_BACK. pname Specifies the single-valued material parameter of the face or faces that is being updated. Must be GL_SHININESS. param Specifies the value that parameter GL_SHININESS will be set to. C SPECIFICATION
void glMaterialfv(GLenum face, GLenum pname, const GLfloat * params); void glMaterialiv(GLenum face, GLenum pname, const GLint * params); PARAMETERS
face Specifies which face or faces are being updated. Must be one of GL_FRONT, GL_BACK, or GL_FRONT_AND_BACK. pname Specifies the material parameter of the face or faces that is being updated. Must be one of GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_EMISSION, GL_SHININESS, GL_AMBIENT_AND_DIFFUSE, or GL_COLOR_INDEXES. params Specifies a pointer to the value or values that pname will be set to. DESCRIPTION
glMaterial assigns values to material parameters. There are two matched sets of material parameters. One, the front-facing set, is used to shade points, lines, bitmaps, and all polygons (when two-sided lighting is disabled), or just front-facing polygons (when two-sided lighting is enabled). The other set, back-facing, is used to shade back-facing polygons only when two-sided lighting is enabled. Refer to the glLightModel() reference page for details concerning one- and two-sided lighting calculations. glMaterial takes three arguments. The first, face, specifies whether the GL_FRONT materials, the GL_BACK materials, or both GL_FRONT_AND_BACK materials will be modified. The second, pname, specifies which of several parameters in one or both sets will be modified. The third, params, specifies what value or values will be assigned to the specified parameter. Material parameters are used in the lighting equation that is optionally applied to each vertex. The equation is discussed in the glLightModel() reference page. The parameters that can be specified using glMaterial, and their interpretations by the lighting equation, are as follows: GL_AMBIENT params contains four integer or floating-point values that specify the ambient RGBA reflectance of the material. Integer values are mapped linearly such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0. Floating-point values are mapped directly. Neither integer nor floating-point values are clamped. The initial ambient reflectance for both front- and back-facing materials is (0.2, 0.2, 0.2, 1.0). GL_DIFFUSE params contains four integer or floating-point values that specify the diffuse RGBA reflectance of the material. Integer values are mapped linearly such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0. Floating-point values are mapped directly. Neither integer nor floating-point values are clamped. The initial diffuse reflectance for both front- and back-facing materials is (0.8, 0.8, 0.8, 1.0). GL_SPECULAR params contains four integer or floating-point values that specify the specular RGBA reflectance of the material. Integer values are mapped linearly such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0. Floating-point values are mapped directly. Neither integer nor floating-point values are clamped. The initial specular reflectance for both front- and back-facing materials is (0, 0, 0, 1). GL_EMISSION params contains four integer or floating-point values that specify the RGBA emitted light intensity of the material. Integer values are mapped linearly such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0. Floating-point values are mapped directly. Neither integer nor floating-point values are clamped. The initial emission intensity for both front- and back-facing materials is (0, 0, 0, 1). GL_SHININESS params is a single integer or floating-point value that specifies the RGBA specular exponent of the material. Integer and floating-point values are mapped directly. Only values in the range 0 128 are accepted. The initial specular exponent for both front- and back-facing materials is 0. GL_AMBIENT_AND_DIFFUSE Equivalent to calling glMaterial twice with the same parameter values, once with GL_AMBIENT and once with GL_DIFFUSE. GL_COLOR_INDEXES params contains three integer or floating-point values specifying the color indices for ambient, diffuse, and specular lighting. These three values, and GL_SHININESS, are the only material values used by the color index mode lighting equation. Refer to the glLightModel() reference page for a discussion of color index lighting. NOTES
The material parameters can be updated at any time. In particular, glMaterial can be called between a call to glBegin() and the corresponding call to glEnd(). If only a single material parameter is to be changed per vertex, however, glColorMaterial() is preferred over glMaterial (see glColorMaterial()). While the ambient, diffuse, specular and emission material parameters all have alpha components, only the diffuse alpha component is used in the lighting computation. ERRORS
GL_INVALID_ENUM is generated if either face or pname is not an accepted value. GL_INVALID_VALUE is generated if a specular exponent outside the range 0 128 is specified. ASSOCIATED GETS
glGetMaterial() SEE ALSO
glColorMaterial(), glLight(), glLightModel() 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 GLMATERIAL(3G)
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