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);
19 if (other.bindingGroup == this.bindingGroup) {
20 if (getBindingMatrix(other).equalsModuloEpsilon(bindingMatrix, 0.001f))
26 getBindingMatrix().inverse()
28 .times(other.getBindingMatrix());
29 other.bindingGroup.merge(bindingGroup, bindingMatrix);
32 public int bindingGroupSize() {
33 if (bindingGroup == null) return 1;
34 return bindingGroup.size();
38 public Matrix getBindingMatrix() {
39 if (bindingGroup==null) return Matrix.ONE;
40 return bindingGroup.getMatrix(this);
43 public Matrix getBindingMatrix(HasBindingGroup other) {
44 if (other==this) return Matrix.ONE;
45 return bindingGroup.getMatrix(this, other);
48 public void unbind() {
49 if (bindingGroup==null) return;
50 bindingGroup.unbind(this);
52 bindingGroupChanged(bindingGroup);
55 public boolean isBoundTo(HasBindingGroup t) {
56 return t==this || (bindingGroup!=null && bindingGroup.contains(t));
59 public Iterable getBoundPeers() {
60 if (bindingGroup==null) bindingGroup = new BindingGroup(this);
63 public void bindingGroupChanged(BindingGroup newBindingGroup) { }