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Thread: matrix rotations

  1. #1
    Junior Member Newbie
    Join Date
    May 2005
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    22

    matrix rotations

    Hello all...
    How would I go about using a matrix rotation in openGL?
    For example, the rotation around the x axis:
    [1 0 0 0
    0 cosA -sinA 0
    0 sinA cosA 0
    0 0 0 1]
    ?

    Thank you...
    -TS...

  2. #2
    Junior Member Newbie
    Join Date
    Mar 2005
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    San Francisco, CA
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    7

    Re: matrix rotations

    Check out the glRotate function call in the OpenGL Redbook

    -jR

  3. #3
    Senior Member Frequent Contributor ehsan2004's Avatar
    Join Date
    Jun 2004
    Location
    Iran
    Posts
    645

    Re: matrix rotations

    This matrix help you to understand the meaning of the rotation around an axis. OpenGL multiplies such matrices to the current modelview matrix--You don't need to do this.
    To rotate around the x axis, use from the following function:
    glRotatef( angle, 1,0,0 );
    and to rotate around the y axis:
    glRotatef( angle, 0,1,0 );
    and finally to rotate around the z axis:
    glRotatef( angle, 0,0,1 );
    to rotate around the vector (nx,ny,nz )use from the following function call:
    glRotatef( angle, nx,ny,nz );

    -Ehsan-

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