glGetMaterialfv, glGetMaterialiv - return material parameters

void glGetMaterialfv( GLenumface, GLenumpname, GLfloat *params) void glGetMaterialiv( GLenumface, GLenumpname, GLint *params)

faceSpecifies which of the two materials is being queried. GL_FRONT or GL_BACK are accepted, representing the front and back materials, respectively.pnameSpecifies the material parameter to return. GL_AMBIENT, GL_DIFFUSE, GL_SPECULAR, GL_EMISSION, GL_SHININESS, and GL_COLOR_INDEXES are accepted.paramsReturns the requested data.

glGetMaterial returns inparamsthe value or values of parameterpnameof materialface. Six parameters are defined: GL_AMBIENTparamsreturns 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. GL_DIFFUSEparamsreturns 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. GL_SPECULARparamsreturns 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. GL_EMISSIONparamsreturns 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. GL_SHININESSparamsreturns 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. GL_COLOR_INDEXESparamsreturns 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. (The other parameters are all used only for RGBA lighting.) Integer values, when requested, are computed by rounding the internal floating-point values to the nearest integer values.

If an error is generated, no change is made to the contents ofparams.

GL_INVALID_ENUM is generated iffaceorpnameis not an accepted value. GL_INVALID_OPERATION is generated if glGetMaterial is called between a call to glBegin and the corresponding call to glEnd.

glMaterial

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Last Edited: *
Fri Dec 6 11:18:03 EST 1996
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