diff options
Diffstat (limited to 'engine/src/core/com/jme3/renderer/queue/TransparentComparator.java')
-rw-r--r-- | engine/src/core/com/jme3/renderer/queue/TransparentComparator.java | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/engine/src/core/com/jme3/renderer/queue/TransparentComparator.java b/engine/src/core/com/jme3/renderer/queue/TransparentComparator.java new file mode 100644 index 0000000..0821eba --- /dev/null +++ b/engine/src/core/com/jme3/renderer/queue/TransparentComparator.java @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2009-2010 jMonkeyEngine + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of 'jMonkeyEngine' nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +package com.jme3.renderer.queue; + +import com.jme3.math.Vector3f; +import com.jme3.renderer.Camera; +import com.jme3.scene.Geometry; + +public class TransparentComparator implements GeometryComparator { + + private Camera cam; + private final Vector3f tempVec = new Vector3f(); + + public void setCamera(Camera cam){ + this.cam = cam; + } + + /** + * Calculates the distance from a spatial to the camera. Distance is a + * squared distance. + * + * @param spat + * Spatial to distancize. + * @return Distance from Spatial to camera. + */ + private float distanceToCam2(Geometry spat){ + if (spat == null) + return Float.NEGATIVE_INFINITY; + + if (spat.queueDistance != Float.NEGATIVE_INFINITY) + return spat.queueDistance; + + Vector3f camPosition = cam.getLocation(); + Vector3f viewVector = cam.getDirection(); + Vector3f spatPosition = null; + + if (spat.getWorldBound() != null){ + spatPosition = spat.getWorldBound().getCenter(); + }else{ + spatPosition = spat.getWorldTranslation(); + } + + spatPosition.subtract(camPosition, tempVec); + spat.queueDistance = tempVec.dot(tempVec); + + float retval = Math.abs(tempVec.dot(viewVector) + / viewVector.dot(viewVector)); + viewVector.mult(retval, tempVec); + + spat.queueDistance = tempVec.length(); + + return spat.queueDistance; + } + + private float distanceToCam(Geometry spat){ + // NOTE: It is best to check the distance + // to the bound's closest edge vs. the bound's center here. + return spat.getWorldBound().distanceToEdge(cam.getLocation()); + } + + public int compare(Geometry o1, Geometry o2) { + float d1 = distanceToCam(o1); + float d2 = distanceToCam(o2); + + if (d1 == d2) + return 0; + else if (d1 < d2) + return 1; + else + return -1; + } +} |