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Geek Culture / Rotation Matrices?

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Neuro Fuzzy
17
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Joined: 11th Jun 2007
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Posted: 8th Aug 2009 10:52
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I've recently learned how to preform matrix operations, for the sole purpose of learning about rotation matrices. Now that i have basic matrix operations (multiply, add, subtract, identity matrices, row operations, etc) down, i want to tackle rotation.

Unfortunately, the only rotation matrix lessons i can find online are for people who already know what a rotation matrix is...

I kind of get the gist of rotation matrices, but not nearly enough to actually use them. Does anyone know of a good tutorial online (or can anyone answer what i need to know) about rotation matrices?
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Phaelax
DBPro Master
22
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Joined: 16th Apr 2003
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Posted: 8th Aug 2009 12:18
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Don't know if this helps, but it's a good read on the subject: http://en.wikipedia.org/wiki/Rotation_matrix

[url="http://dbcc.zimnox.com"][/url]
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Zotoaster
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Posted: 8th Aug 2009 12:23
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They are very simple AFAIK.

Take a vector that you want to rotate, and turn it into a matrix, with 3 rows and 1 column (1 row per dimension). Then, simply multiply it by the rotation matrix, giving the angles you want to rotate by. That will result in a new 1x3 matrix, which you can turn into a vector, which will be a vector like your old one but rotated by the specified angle.
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kaedroho
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Joined: 21st Aug 2007
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Posted: 8th Aug 2009 16:11
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If your using DBPro, you can simply use rotate (xyz) matrix4 to rotate matrices.

You need to have 1 matrix for each axis then multiply the z by the y then the result of that by the x and you have a full rotation matrix.

Devstorm - Indie Game Development Network
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Neuro Fuzzy
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Posted: 9th Aug 2009 03:03
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I am using dbpro. Don't i want a 3X3 matrix? and doesn't "make matrix4" make a 4X4 matrix? I don't get how to apply this in dbpro :S

Thanks for the explanations though, I get the basics of rotation matrices now.
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