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add m_scaling doc

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Justin Lin
2019-05-02 10:27:52 +08:00
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# m_scaling
Generate a 4x4 transformation matrix which can pass into `multmatrix` to scale its child elements using the specified vector.
## Parameters
- `v` : Elements will be scaled using the vector.
## Examples
include <m_scaling.scad>;
cube(10);
translate([15, 0, 0])
multmatrix(m_scaling([0.5, 1, 2]))
cube(10);
![m_scaling](images/lib-m_scaling-1.JPG)