📄 fglmultmatrix.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>fglMultMatrixd,</STRONG> <STRONG>fglMultMatrixf</STRONG> - multiply the current matrix with the specified matrix <STRONG>FORTRAN</STRONG> <STRONG>SPECIFICATION</STRONG> SUBROUTINE <STRONG>fglMultMatrixd</STRONG>( CHARACTER*8 <EM>m</EM> ) SUBROUTINE <STRONG>fglMultMatrixf</STRONG>( CHARACTER*8 <EM>m</EM> ) <STRONG>PARAMETERS</STRONG> <EM>m</EM> Points to 16 consecutive values that are used as the elements of a 4x4 column-major matrix. <STRONG>DESCRIPTION</STRONG> <STRONG>fglMultMatrix</STRONG> multiplies the current matrix with the one specified using <EM>m</EM>, and replaces the current matrix with the product. The current matrix is determined by the current matrix mode (see <STRONG>fglMatrixMode</STRONG>). It is either the projection matrix, modelview matrix, or the texture matrix. <STRONG>EXAMPLES</STRONG> If the current matrix is C, and the coordinates to be transformed are, v=(v[0],v[1],v[2],v[3]). Then the current transformation is C x v, or (c[0] c[4] c[8] c[12] ) (v[0] ) | | | | |c[1] c[5] c[9] c[13] | |v[1] | |c[2] c[6] c[10] c[14] | x |v[2] | | | | | (c[3] c[7] c[11] c[15] ) (v[3] ) Calling <STRONG>fglMultMatrix</STRONG> with an argument of m=m[0],m[1],...,m[15] replaces the current transformation with (C x M) x v, or (c[0] c[4] c[8] c[12] ) (m[0] m[4] m[8] m[12] ) (v[0] ) | | | | | | |c[1] c[5] c[9] c[13] | |m[1] m[5] m[9] m[13] | |v[1] | |c[2] c[6] c[10] c[14] | x |m[2] m[6] m[10] m[14] | x |v[2] | | | | | | | (c[3] c[7] c[11] c[15] ) (m[3] m[7] m[11] m[15] ) (v[3] ) Where 'x' denotes matrix multiplication, and v is represented as a 4 x 1 matrix. <STRONG>NOTES</STRONG> While the elements of the matrix may be specified with single or double precision, the GL may store or operate on these values in less than single precision. In many computer languages 4x4 arrays are represented in row-major order. The transformations just described represent these matrices in column-major order. The order of the multiplication is important. For example, if the current transformation is a rotation, and <STRONG>fglMultMatrix</STRONG> is called with a translation matrix, the translation is done directly on the coordinates to be transformed, while the rotation is done on the results of that translation. <STRONG>ERRORS</STRONG> <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>fglMultMatrix</STRONG> is executed between the execution of <STRONG>fglBegin</STRONG> and the corresponding execution of <STRONG>fglEnd</STRONG>. <STRONG>ASSOCIATED</STRONG> <STRONG>GETS</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_MATRIX_MODE</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_MODELVIEW_MATRIX</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_PROJECTION_MATRIX</STRONG> <STRONG>fglGet</STRONG> with argument <STRONG>GL_TEXTURE_MATRIX</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>fglLoadIdentity</STRONG>, <STRONG>fglLoadMatrix</STRONG>, <STRONG>fglMatrixMode</STRONG>, <STRONG>fglPushMatrix</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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