

 
GLGETMATERIAL() 

GLGETMATERIAL() 
glGetMaterialfv, glGetMaterialiv  return material parameters
void glGetMaterialfv( GLenum face,
GLenum pname,
GLfloat *params )
void glGetMaterialiv( GLenum face,
GLenum pname,
GLint *params )
 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.
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 floatingpoint values representing
the ambient reflectance of the material. Integer values, when requested,
are linearly mapped from the internal floatingpoint 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 floatingpoint values representing
the diffuse reflectance of the material. Integer values, when requested,
are linearly mapped from the internal floatingpoint 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 floatingpoint values representing
the specular reflectance of the material. Integer values, when requested,
are linearly mapped from the internal floatingpoint 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 floatingpoint values representing
the emitted light intensity of the material. Integer values, when
requested, are linearly mapped from the internal floatingpoint
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, 1.0], the
corresponding integer return value is undefined. The initial value is (0,
0, 0, 1).
 GL_SHININESS
 params returns one integer or floatingpoint value representing the
specular exponent of the material. Integer values, when requested, are
computed by rounding the internal floatingpoint value to the nearest
integer value. The initial value is 0.
 GL_COLOR_INDEXES
 params returns three integer or floatingpoint 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 floatingpoint values to the nearest integer
values.
If an error is generated, no change is made to the contents of params.
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.
glMaterial
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