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# a 60 degree rotation matrix

Posted on 2008-11-10
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Hi

I have a 3d system drawn on a piece of paper, the y axis is coming out of the paper towards me. I want to rotate an object by 60 degrees around the y axis, counter-clockwise. So if the object is looking at the top of the page, after the rotation it should be looking more towards the right side of the page. What's the matrix to do that?

Thanks
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Question by:DJ_AM_Juicebox

LVL 25

Accepted Solution

You can find the necessary rotation matrices here:
http://en.wikipedia.org/wiki/Rotation_matrix#The_3-dimensional_rotation_matricies

[cos 60   0   sin 60]
[    0        1        0   ]
[-sin 60   0   cos 60]

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LVL 25

Expert Comment

'So if the object is looking at the top of the page, after the rotation it should be looking more towards the right side of the page.'

If your rotation is CCW (which the above transformation performs in a right-handed system), then the object will look more to the left side of the page.
If you wish to go in a CW direction, then replace 60 with -60.

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