1/*
2 * Copyright (c) 2009-2010 jMonkeyEngine
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 *   notice, this list of conditions and the following disclaimer.
11 *
12 * * Redistributions in binary form must reproduce the above copyright
13 *   notice, this list of conditions and the following disclaimer in the
14 *   documentation and/or other materials provided with the distribution.
15 *
16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
17 *   may be used to endorse or promote products derived from this software
18 *   without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33package com.jme3.collision.bih;
34
35import com.jme3.math.FastMath;
36import com.jme3.math.Vector3f;
37
38public final class BIHTriangle {
39
40    private final Vector3f pointa = new Vector3f();
41    private final Vector3f pointb = new Vector3f();
42    private final Vector3f pointc = new Vector3f();
43    private final Vector3f center = new Vector3f();
44
45    public BIHTriangle(Vector3f p1, Vector3f p2, Vector3f p3) {
46        pointa.set(p1);
47        pointb.set(p2);
48        pointc.set(p3);
49        center.set(pointa);
50        center.addLocal(pointb).addLocal(pointc).multLocal(FastMath.ONE_THIRD);
51    }
52
53    public Vector3f get1(){
54        return pointa;
55    }
56
57    public Vector3f get2(){
58        return pointb;
59    }
60
61    public Vector3f get3(){
62        return pointc;
63    }
64
65    public Vector3f getCenter() {
66        return center;
67    }
68
69    public Vector3f getNormal(){
70        Vector3f normal = new Vector3f(pointb);
71        normal.subtractLocal(pointa).crossLocal(pointc.x-pointa.x, pointc.y-pointa.y, pointc.z-pointa.z);
72        normal.normalizeLocal();
73        return normal;
74    }
75
76    public float getExtreme(int axis, boolean left){
77        float v1, v2, v3;
78        switch (axis){
79            case 0: v1 = pointa.x; v2 = pointb.x; v3 = pointc.x; break;
80            case 1: v1 = pointa.y; v2 = pointb.y; v3 = pointc.y; break;
81            case 2: v1 = pointa.z; v2 = pointb.z; v3 = pointc.z; break;
82            default: assert false; return 0;
83        }
84        if (left){
85            if (v1 < v2){
86                if (v1 < v3)
87                    return v1;
88                else
89                    return v3;
90            }else{
91                if (v2 < v3)
92                    return v2;
93                else
94                    return v3;
95            }
96        }else{
97            if (v1 > v2){
98                if (v1 > v3)
99                    return v1;
100                else
101                    return v3;
102            }else{
103                if (v2 > v3)
104                    return v2;
105                else
106                    return v3;
107            }
108        }
109    }
110
111}
112