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.renderer.queue; 34 35 import com.jme3.math.Vector3f; 36 import com.jme3.renderer.Camera; 37 import com.jme3.scene.Geometry; 38 39 public class TransparentComparator implements GeometryComparator { 40 41 private Camera cam; 42 private final Vector3f tempVec = new Vector3f(); 43 setCamera(Camera cam)44 public void setCamera(Camera cam){ 45 this.cam = cam; 46 } 47 48 /** 49 * Calculates the distance from a spatial to the camera. Distance is a 50 * squared distance. 51 * 52 * @param spat 53 * Spatial to distancize. 54 * @return Distance from Spatial to camera. 55 */ distanceToCam2(Geometry spat)56 private float distanceToCam2(Geometry spat){ 57 if (spat == null) 58 return Float.NEGATIVE_INFINITY; 59 60 if (spat.queueDistance != Float.NEGATIVE_INFINITY) 61 return spat.queueDistance; 62 63 Vector3f camPosition = cam.getLocation(); 64 Vector3f viewVector = cam.getDirection(); 65 Vector3f spatPosition = null; 66 67 if (spat.getWorldBound() != null){ 68 spatPosition = spat.getWorldBound().getCenter(); 69 }else{ 70 spatPosition = spat.getWorldTranslation(); 71 } 72 73 spatPosition.subtract(camPosition, tempVec); 74 spat.queueDistance = tempVec.dot(tempVec); 75 76 float retval = Math.abs(tempVec.dot(viewVector) 77 / viewVector.dot(viewVector)); 78 viewVector.mult(retval, tempVec); 79 80 spat.queueDistance = tempVec.length(); 81 82 return spat.queueDistance; 83 } 84 distanceToCam(Geometry spat)85 private float distanceToCam(Geometry spat){ 86 // NOTE: It is best to check the distance 87 // to the bound's closest edge vs. the bound's center here. 88 return spat.getWorldBound().distanceToEdge(cam.getLocation()); 89 } 90 compare(Geometry o1, Geometry o2)91 public int compare(Geometry o1, Geometry o2) { 92 float d1 = distanceToCam(o1); 93 float d2 = distanceToCam(o2); 94 95 if (d1 == d2) 96 return 0; 97 else if (d1 < d2) 98 return 1; 99 else 100 return -1; 101 } 102 } 103