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 33 package com.jme3.collision.bih; 34 35 import com.jme3.math.FastMath; 36 import com.jme3.math.Vector3f; 37 38 public 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 BIHTriangle(Vector3f p1, Vector3f p2, Vector3f p3)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 get1()53 public Vector3f get1(){ 54 return pointa; 55 } 56 get2()57 public Vector3f get2(){ 58 return pointb; 59 } 60 get3()61 public Vector3f get3(){ 62 return pointc; 63 } 64 getCenter()65 public Vector3f getCenter() { 66 return center; 67 } 68 getNormal()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 getExtreme(int axis, boolean left)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