1 package edu.berkeley.qfat.geom;
2 import javax.media.opengl.*;
4 import edu.berkeley.qfat.Mesh;
6 public abstract class HasBindingGroup {
8 public BindingGroup bindingGroup;
10 // know: self = bindingGroup[self] * master
11 // know: other = other.bindingGroup[other] * other.bindingGroup.master
12 // want: self = bindingMatrix * other
13 // therefore: master = bindingGroup[self]^-1 * bindingMatrix * other
14 // therefore: = bindingGroup[self]^-1 * bindingMatrix * other.bindingGroup[other] * other.bindingGroup.master
15 public void bindTo(Matrix bindingMatrix, HasBindingGroup other) {
16 if (bindingGroup == null) bindingGroup = new BindingGroup(this);
17 if (other.bindingGroup == null) other.bindingGroup = new BindingGroup(other);
20 getBindingMatrix().inverse()
22 .times(other.getBindingMatrix());
23 other.bindingGroup.merge(bindingGroup, bindingMatrix);
26 public int bindingGroupSize() {
27 if (bindingGroup == null) return 1;
28 return bindingGroup.size();
32 public Matrix getBindingMatrix() {
33 if (bindingGroup==null) return Matrix.ONE;
34 return bindingGroup.getMatrix(this);
37 public Matrix getBindingMatrix(HasBindingGroup other) {
38 if (other==this) return Matrix.ONE;
39 return bindingGroup.getMatrix(this, other);
42 public void unbind() {
43 if (bindingGroup==null) return;
44 bindingGroup.unbind(this);
46 bindingGroupChanged(bindingGroup);
49 public boolean isBoundTo(HasBindingGroup t) {
50 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
53 public Iterable getBoundPeers() {
54 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
57 public void bindingGroupChanged(BindingGroup newBindingGroup) { }