Subject:
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Re: rotation matrix
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Sat, 15 Dec 2001 22:03:47 GMT
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Viewed:
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3995 times
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In lugnet.cad.mlcad, Jason Hill writes:
> Could anyone be kind enough to explain the rotation matrix in MLCAD?
>
> Thanks
>
> QBF
This is linear algebra.
The coord vectors are multiplied by the 3x3 matrix.
a b c d e f g h i
actually stands for
a b c
d e f
g h i
Some effects can be achieved using matrices:
1 0 0
0 1 0 this is the identity matrix (no effect)
0 0 1
a 0 0
0 b 0 this is the scale matrix
0 0 c it scales by a in x direction, b in y direction, c in z direction
you can also obtain mirror effect with negative values
-1 0 0
0 1 0 this is the x-axis mirror matrix
0 0 1
1 0 0
0 -1 0 this is the y-axis mirror matrix
0 0 1
1 0 0
0 1 0 this is the z-axis mirror matrix
0 0 -1
There are also rotation matrices...
When multipling matrices you cumulate the effects of them.
You can find more informations in a linear algebra book or, better, in a 3D
programming book.
Damien
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