Unix/Linux Go Back    


CentOS 7.0 - man page for glgetmaterial (centos section 3G)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)


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)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums


All times are GMT -4. The time now is 01:06 PM.