| /* |
| * 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.light; |
| |
| import com.jme3.bounding.BoundingVolume; |
| import com.jme3.export.*; |
| import com.jme3.math.FastMath; |
| import com.jme3.math.Vector3f; |
| import com.jme3.scene.Spatial; |
| import java.io.IOException; |
| |
| /** |
| * Represents a spot light. |
| * A spot light emmit a cone of light from a position and in a direction. |
| * It can be used to fake torch lights or car's lights. |
| * <p> |
| * In addition to a position and a direction, spot lights also have a range which |
| * can be used to attenuate the influence of the light depending on the |
| * distance between the light and the effected object. |
| * Also the angle of the cone can be tweaked by changing the spot inner angle and the spot outer angle. |
| * the spot inner angle determin the cone of light where light has full influence. |
| * the spot outer angle determin the cone global cone of light of the spot light. |
| * the light intensity slowly decrease between the inner cone and the outer cone. |
| * @author Nehon |
| */ |
| public class SpotLight extends Light implements Savable { |
| |
| protected Vector3f position = new Vector3f(); |
| protected Vector3f direction = new Vector3f(0,-1,0); |
| protected float spotInnerAngle = FastMath.QUARTER_PI / 8; |
| protected float spotOuterAngle = FastMath.QUARTER_PI / 6; |
| protected float spotRange = 100; |
| protected float invSpotRange = 1 / 100; |
| protected float packedAngleCos=0; |
| |
| public SpotLight() { |
| super(); |
| computePackedCos(); |
| } |
| |
| private void computePackedCos() { |
| float innerCos=FastMath.cos(spotInnerAngle); |
| float outerCos=FastMath.cos(spotOuterAngle); |
| packedAngleCos=(int)(innerCos*1000); |
| packedAngleCos+=outerCos; |
| } |
| |
| @Override |
| protected void computeLastDistance(Spatial owner) { |
| if (owner.getWorldBound() != null) { |
| BoundingVolume bv = owner.getWorldBound(); |
| lastDistance = bv.distanceSquaredTo(position); |
| } else { |
| lastDistance = owner.getWorldTranslation().distanceSquared(position); |
| } |
| } |
| |
| @Override |
| public Type getType() { |
| return Type.Spot; |
| } |
| |
| public Vector3f getDirection() { |
| return direction; |
| } |
| |
| public void setDirection(Vector3f direction) { |
| this.direction.set(direction); |
| } |
| |
| public Vector3f getPosition() { |
| return position; |
| } |
| |
| public void setPosition(Vector3f position) { |
| this.position.set(position); |
| } |
| |
| public float getSpotRange() { |
| return spotRange; |
| } |
| |
| /** |
| * Set the range of the light influence. |
| * <p> |
| * Setting a non-zero range indicates the light should use attenuation. |
| * If a pixel's distance to this light's position |
| * is greater than the light's range, then the pixel will not be |
| * effected by this light, if the distance is less than the range, then |
| * the magnitude of the influence is equal to distance / range. |
| * |
| * @param spotRange the range of the light influence. |
| * |
| * @throws IllegalArgumentException If spotRange is negative |
| */ |
| public void setSpotRange(float spotRange) { |
| if (spotRange < 0) { |
| throw new IllegalArgumentException("SpotLight range cannot be negative"); |
| } |
| this.spotRange = spotRange; |
| if (spotRange != 0) { |
| this.invSpotRange = 1 / spotRange; |
| } else { |
| this.invSpotRange = 0; |
| } |
| } |
| |
| /** |
| * for internal use only |
| * @return the inverse of the spot range |
| */ |
| public float getInvSpotRange() { |
| return invSpotRange; |
| } |
| |
| /** |
| * returns the spot inner angle |
| * @return the spot inner angle |
| */ |
| public float getSpotInnerAngle() { |
| return spotInnerAngle; |
| } |
| |
| /** |
| * Sets the inner angle of the cone of influence. |
| * This angle is the angle between the spot direction axis and the inner border of the cone of influence. |
| * @param spotInnerAngle |
| */ |
| public void setSpotInnerAngle(float spotInnerAngle) { |
| this.spotInnerAngle = spotInnerAngle; |
| computePackedCos(); |
| } |
| |
| /** |
| * returns the spot outer angle |
| * @return the spot outer angle |
| */ |
| public float getSpotOuterAngle() { |
| return spotOuterAngle; |
| } |
| |
| /** |
| * Sets the outer angle of the cone of influence. |
| * This angle is the angle between the spot direction axis and the outer border of the cone of influence. |
| * this should be greater than the inner angle or the result will be unexpected. |
| * @param spotOuterAngle |
| */ |
| public void setSpotOuterAngle(float spotOuterAngle) { |
| this.spotOuterAngle = spotOuterAngle; |
| computePackedCos(); |
| } |
| |
| /** |
| * for internal use only |
| * @return the cosines of the inner and outter angle packed in a float |
| */ |
| public float getPackedAngleCos() { |
| return packedAngleCos; |
| } |
| |
| |
| |
| @Override |
| public void write(JmeExporter ex) throws IOException { |
| super.write(ex); |
| OutputCapsule oc = ex.getCapsule(this); |
| oc.write(direction, "direction", new Vector3f()); |
| oc.write(position, "position", new Vector3f()); |
| oc.write(spotInnerAngle, "spotInnerAngle", FastMath.QUARTER_PI / 8); |
| oc.write(spotOuterAngle, "spotOuterAngle", FastMath.QUARTER_PI / 6); |
| oc.write(spotRange, "spotRange", 100); |
| } |
| |
| @Override |
| public void read(JmeImporter im) throws IOException { |
| super.read(im); |
| InputCapsule ic = im.getCapsule(this); |
| spotInnerAngle = ic.readFloat("spotInnerAngle", FastMath.QUARTER_PI / 8); |
| spotOuterAngle = ic.readFloat("spotOuterAngle", FastMath.QUARTER_PI / 6); |
| direction = (Vector3f) ic.readSavable("direction", new Vector3f()); |
| position = (Vector3f) ic.readSavable("position", new Vector3f()); |
| spotRange = ic.readFloat("spotRange", 100); |
| if (spotRange != 0) { |
| this.invSpotRange = 1 / spotRange; |
| } else { |
| this.invSpotRange = 0; |
| } |
| } |
| } |