HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 289

M glMultMatrix Chapter 11 glMultMatrix glMultMatrixd, glMultMatrixf: multiply the current matrix with the specified matrix. C Specification void glMultMatrixd( const GLdouble *m) void glMultMatrixf( const GLfloat *m) Parameters m Points to 16 consecutive values that are used as the elements of a 4 × 4 column-major matrix. Description glMultMatrix multiplies the current matrix with the one specified using m, and replaces the current matrix with the product. The current matrix is determined by the current matrix mode (see glMatrixMode). It is either the projection matrix, modelview matrix, or the texture matrix. Examples 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 × 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] v[2] C[3] C[7] C[11] C[15] v[3] Calling glMultMatrix with an argument of m = m[0], m[1], . . ., m[15] replaces the current transformation with (C × m) × 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[5] m[13] × v[1] C[2] C[6] C[10] C[14] m[2] m[6] m[10] m[14] v[2] C[3] C[7] C[11] C[15] m[3] m[7] m[11] m[15] v[3] Where × denotes matrix multiplication, and v is represented as a 4 × 1 matrix. Notes 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. 289