NAMEglGetMaterialfv,glGetMaterialiv- return material parametersCSPECIFICATIONvoidglGetMaterialfv( GLenumface, GLenumpname, GLfloat *params) voidglGetMaterialiv( GLenumface, GLenumpname, GLint *params)PARAMETERSfaceSpecifies which of the two materials is being queried.GL_FRONTorGL_BACKare accepted, representing the front and back materials, respectively.pnameSpecifies the material parameter to return.GL_AMBIENT,GL_DIFFUSE,GL_SPECULAR,GL_EMISSION,GL_SHININESS, andGL_COLOR_INDEXESare accepted.paramsReturns the requested data.DESCRIPTIONglGetMaterialreturns 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. The initial value is (0.2, 0.2, 0.2, 1.0)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. The initial value is (0.8, 0.8, 0.8, 1.0).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. The initial value is (0, 0, 0, 1).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, 1.0], the corresponding integer return value is undefined. The initial value is (0, 0, 0, 1).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. The initial value is 0.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. (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.NOTESIf an error is generated, no change is made to the contents ofparams.ERRORSGL_INVALID_ENUMis generated iffaceorpnameis not an accepted value.GL_INVALID_OPERATIONis generated ifglGetMaterialis executed between the execution ofglBeginand the corresponding execution ofglEnd.SEEALSOglMaterial