# m_rotation

Generate a 4x4 transformation matrix which can pass into `multmatrix` to rotate the child element about the axis of the coordinate system or around an arbitrary axis.

Since: 1.1

## Parameters

• `a` : If it's `[deg_x, deg_y, deg_z]`, the rotation is applied in the order `x`, `y`, `z`. If it's `[deg_x, deg_y]`, the rotation is applied in the order `x`, `y`. If it's`[deg_x]`, the rotation is only applied to the `x` axis. If it's an number, the rotation is only applied to the `z` axis or an arbitrary axis.
• `v`: A vector allows you to set an arbitrary axis about which the object will be rotated. When `a` is an array, the `v` argument is ignored.

## Examples

``````use <matrix/m_rotation.scad>;

point = [20, 0, 0];
a = [0, -45, 45];

hull() {
sphere(1);
multmatrix(m_rotation(a))
translate(point)
sphere(1);
}
`````` ``````use <matrix/m_rotation.scad>;

v = [10, 10, 10];

hull() {
sphere(1);
translate(v)
sphere(1);
}

p = [10, 10, 0];
for(i = [0:20:340]) {
multmatrix(m_rotation(a = i, v = v))
translate(p)
sphere(1);
}
`````` 