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add m_multiply doc

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Justin Lin
2019-05-02 10:33:43 +08:00
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# m_multiply
Multiply two 4x4 transformation matrice.
## Parameters
- `ma`, `mb` : Two 4x4 transformation matrice.
## Examples
include <m_multiply.scad>;
include <m_scaling.scad>;
include <m_rotation.scad>;
ma = m_scaling([0.5, 1, 2]);
mb = m_rotation([0, 0, 90]);
cube(10);
multmatrix(m_multiply(ma, mb))
translate([15, 0, 0]) cube(10);
![m_multiply](images/lib-m_multiply-1.JPG)