GLROTATE()

NAME

glRotated, glRotatef − multiply the current matrix by a rotation matrix

C SPECIFICATION

void glRotated( GLdouble angle,

GLdouble x,
GLdouble y,
GLdouble z )

void glRotatef( GLfloat angle,

GLfloat x,
GLfloat y,
GLfloat 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(x,y,z). 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:

⎛
⎝ ccol {"x" "y" (1 - c)-"z" s above "y" "y" (1 - c)+ c above "y" "z" (1 - c)+ "x" s above ~0 }

ccol { "x" "z" (1 - c)+ "y" s above "y" "z" (1 - c)- "x" s above "z" "z" (1 - c) + c above ~0 }
ccol { ~0 above ~0 above ~0 above ~1} } ~~ right )

Wherec = cos(angle),s = sine(angle), and ||( x,y,z )|| = 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(x,y,z) points toward the user, the rotation will be counterclockwise.

ERRORS

GL_INVALID_OPERATION is generated if glRotate is executed between the execution of glBegin and the corresponding execution of glEnd.

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

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