Combine two SFRotation into a single SFRotation using VRMLScript

combine_rotations.wrl

#VRML V2.0 utf8


Viewpoint{
	position 0 0 10
}



#
# Box 1: encapsulated transforms.
#
DEF box1_outer Transform {
	rotation 0.5 0.4 0.1 2
	children DEF box1_inner Transform {
		rotation 0.1 0.6 0.3 -0.8
		children DEF obj Shape {
			appearance Appearance {
				material Material {
					diffuseColor 0 0 0
					emissiveColor 1 0 0
				}
			}
			geometry Box{size 4 1 2}
		}
	}
}


#
# Box 2: larger box with only one transform (that combines the transformation of the box with two transforms).
#
DEF box2 Transform {
	children Shape {
		appearance Appearance {
			material Material {
				diffuseColor 0 0 0
				emissiveColor 0 1 0
				transparency 0.5
			}
		}
		geometry Box{size 6 2 4}
	}
}


Script {
	field	SFNode	box1_outer		USE	box1_outer
	field	SFNode	box1_inner		USE	box1_inner
	field	SFNode	box2			USE	box2

	directOutput TRUE
	url "javascript:

	function add_rotations(outer_rotation, inner_rotation) {
		var result = new SFRotation();
		var p = new SFVec3f(0, 0, 0);
		var outer = new VrmlMatrix();
		var inner = new VrmlMatrix();
		outer.setTransform(p, outer_rotation);
		inner.setTransform(p, inner_rotation);
		outer.multLeft(inner).getTransform(null, result, null);
		return result;
	}


	function initialize(){
		box2.rotation = add_rotations (
			box1_outer.rotation,
			box1_inner.rotation
		);
	}

	"
}