glRotate

Name

glRotate — multiply the current matrix by a rotation matrix

C Specification

`void glRotatef(`	GLfloat `angle`,
	GLfloat `x`,
	GLfloat `y`,
	GLfloat `z)`;

`void glRotatex(`	GLfixed `angle`,
	GLfixed `x`,
	GLfixed `y`,
	GLfixed `z)`;

Parameters

angle: Specifies the angle of rotation, in degrees.
x, y, z: Specify the x, y, and z coordinates of a vector, respectively.

Description

glRotate produces a rotation of angle degrees around the vector xyz . The current matrix (see glMatrixMode) is multiplied by a rotation matrix with the product replacing the current matrix, as if glMultMatrix were called with the following matrix as its argument:

( x2 (1-c) +c xy (1-c) -zs xz (1-c) +ys 0 xy (1-c) +zs y2 (1-c) +c yz (1-c) -xs 0 xz (1-c) -ys yz (1-c) +xs z2 (1-c) +c 0 0 0 0 1 )

Where c=cosangle , s=sinangle , and ||xyz|| =1 , (if not, the GL will normalize this vector).

If the matrix mode is either GL_MODELVIEW or GL_PROJECTION, all objects drawn after glRotate is called are rotated. Use glPushMatrix and glPopMatrix to save and restore the unrotated coordinate system.

Notes

This rotation follows the right-hand rule, so if the vector xyz points toward the user, the rotation will be counterclockwise.

Associated Gets

glGet with argument GL_MATRIX_MODE

glGet with argument GL_MODELVIEW_MATRIX

glGet with argument GL_PROJECTION_MATRIX

glGet with argument GL_TEXTURE_MATRIX