color([1,0,0]) rotate([0,0,0]) translate([0,0,0]) cube(10,true);
color([0,0,1,0.5]) rotate([5,5,5]) translate([5,5,5]) cube(10,true);

translate([20,-5,-8]) rotate([90,0,90]) text("<-------->", 2);
translate([20,-3.5,-10]) rotate([90,0,90]) text("10 cm", 2);