Lesson
Challenge
Standards

multimatrix()

What is it?

Multimatrix are matrix routines to make life in OpenSCAD easier. It allows you to multiply the geometry of all child elements with the given 4x4 transformation matrix. 
//translates the cylinder  by [10, 20, 30]
multmatrix(m = [ [1, 0, 0, 10],
                 [0, 1, 0, 20],
                 [0, 0, 1, 30],
                 [0, 0, 0,  1]
               ]) cylinder();

//rotates by 45 degrees in XY plane and translates by [10,20,30]):
angle=45;
multmatrix(m = [ [cos(angle), -sin(angle), 0, 10],
                [sin(angle), cos(angle), 0, 20],
                [0, 0, 1, 30],
                [0, 0, 0,  1]
              ]) union() {
   cylinder(r=10.0,h=10,center=false);
   cube(size=[10,10,10],center=false);
}