1 package edu.berkeley.qfat.geom;
2 import javax.media.opengl.*;
4 /** any object associated with a specific point in 3D space */
5 public abstract class HasQuadric extends HasPoint {
7 public Matrix errorQuadric() { return quadric; }
8 public boolean quadricStale = false;
9 /** the nearest vertex in the "score_against" mesh */
10 public HasQuadric nearest_in_other_mesh;
12 /** the number of vertices in the other mesh for which this is the nearest_in_other_mesh */
13 public int quadric_count;
15 /** the total error quadric (contributions from all vertices in other mesh for which this is nearest) */
16 public Matrix quadric = Matrix.ZERO;
18 public Matrix fundamentalQuadric = null;
20 public void recomputeFundamentalQuadricIfNeighborChanged() {
21 HasQuadric oldv = nearest_in_other_mesh;
22 HasQuadric newv = nearest();
23 if (oldv==newv) return;
24 recomputeFundamentalQuadric();
25 if (oldv!=null) oldv.recomputeFundamentalQuadricIfNeighborChanged();
26 // for some reason this causes an infinite loop
27 //if (newv!=null) newv.recomputeFundamentalQuadricIfNeighborChanged();
29 public void recomputeFundamentalQuadricIfStale() {
30 if (quadricStale || fundamentalQuadric==null)
31 recomputeFundamentalQuadric();
33 public void recomputeFundamentalQuadric() {
34 unApplyQuadricToNeighbor();
35 if (quadricStale || fundamentalQuadric==null) {
36 fundamentalQuadric = _recomputeFundamentalQuadric();
39 applyQuadricToNeighbor();
41 public abstract Matrix _recomputeFundamentalQuadric();
42 public void reComputeError() {
46 public abstract void unComputeError();
47 public abstract void computeError();
48 public abstract HasQuadric nearest();
49 public void applyQuadricToNeighbor() {
50 HasQuadric new_nearest = nearest();
51 if (nearest_in_other_mesh != null && new_nearest == nearest_in_other_mesh) return;
53 if (nearest_in_other_mesh != null) unApplyQuadricToNeighbor();
54 if (nearest_in_other_mesh != null) throw new Error();
56 nearest_in_other_mesh = new_nearest;
58 if (nearest_in_other_mesh!=null) {
59 nearest_in_other_mesh.unComputeError();
60 nearest_in_other_mesh.quadric = nearest_in_other_mesh.quadric.plus(fundamentalQuadric());
61 nearest_in_other_mesh.quadric_count++;
62 nearest_in_other_mesh.computeError();
67 public Matrix fundamentalQuadric() {
68 if (fundamentalQuadric == null) recomputeFundamentalQuadric();
69 return fundamentalQuadric;
71 public void unApplyQuadricToNeighbor() {
72 if (nearest_in_other_mesh == null) return;
73 if (fundamentalQuadric == null) return;
74 nearest_in_other_mesh.unComputeError();
75 nearest_in_other_mesh.quadric = nearest_in_other_mesh.quadric.minus(fundamentalQuadric);
76 nearest_in_other_mesh.quadric_count--;
77 if (nearest_in_other_mesh.quadric_count==0)
78 nearest_in_other_mesh.quadric = Matrix.ZERO;
79 nearest_in_other_mesh.computeError();
80 nearest_in_other_mesh = null;