GLROTATE(3G) UNIX Programmer's Manual GLROTATE(3G)
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:
|
| x2(1-c) + c xy(1-c) - zs xz(1-c) + ys 0 |
| |
| yx(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 = cos(angle), s = sin(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 unro-
tated 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 coun-
terclockwise.
MirBSD #10-current Printed 2021-12-07 1
GLROTATE(3G) UNIX Programmer's Manual GLROTATE(3G)
ERRORS
GL_INVALID_OPERATION is generated if glRotate is executed
between the execution of glBegin and the corresponding exe-
cution of glEnd.
ASSOCIATED GETS
glGet with argument GL_MATRIX_MODE
glGet with argument GL_COLOR_MATRIX
glGet with argument GL_MODELVIEW_MATRIX
glGet with argument GL_PROJECTION_MATRIX
glGet with argument GL_TEXTURE_MATRIX
SEE ALSO
glMatrixMode(3G), glMultMatrix(3G), glPushMatrix(3G),
glScale(3G), glTranslate(3G)
MirBSD #10-current Printed 2021-12-07 2