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glMultMatrix

Chapter 11

289

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.

HP b2600 Reference Guide

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