1 package com.jme3.effect.influencers; 2 3 import com.jme3.effect.Particle; 4 import com.jme3.effect.shapes.EmitterShape; 5 import com.jme3.export.InputCapsule; 6 import com.jme3.export.JmeExporter; 7 import com.jme3.export.JmeImporter; 8 import com.jme3.export.OutputCapsule; 9 import com.jme3.math.FastMath; 10 import com.jme3.math.Vector3f; 11 import java.io.IOException; 12 13 /** 14 * This emitter influences the particles so that they move all in the same direction. 15 * The direction may vary a little if the velocity variation is non zero. 16 * This influencer is default for the particle emitter. 17 * @author Marcin Roguski (Kaelthas) 18 */ 19 public class DefaultParticleInfluencer implements ParticleInfluencer { 20 21 /** Temporary variable used to help with calculations. */ 22 protected transient Vector3f temp = new Vector3f(); 23 /** The initial velocity of the particles. */ 24 protected Vector3f startVelocity = new Vector3f(); 25 /** The velocity's variation of the particles. */ 26 protected float velocityVariation = 0.2f; 27 28 @Override 29 public void influenceParticle(Particle particle, EmitterShape emitterShape) { 30 emitterShape.getRandomPoint(particle.position); 31 this.applyVelocityVariation(particle); 32 } 33 34 /** 35 * This method applies the variation to the particle with already set velocity. 36 * @param particle 37 * the particle to be affected 38 */ 39 protected void applyVelocityVariation(Particle particle) { 40 particle.velocity.set(startVelocity); 41 temp.set(FastMath.nextRandomFloat(), FastMath.nextRandomFloat(), FastMath.nextRandomFloat()); 42 temp.multLocal(2f); 43 temp.subtractLocal(1f, 1f, 1f); 44 temp.multLocal(startVelocity.length()); 45 particle.velocity.interpolate(temp, velocityVariation); 46 } 47 48 @Override 49 public void write(JmeExporter ex) throws IOException { 50 OutputCapsule oc = ex.getCapsule(this); 51 oc.write(startVelocity, "startVelocity", Vector3f.ZERO); 52 oc.write(velocityVariation, "variation", 0.2f); 53 } 54 55 @Override 56 public void read(JmeImporter im) throws IOException { 57 InputCapsule ic = im.getCapsule(this); 58 startVelocity = (Vector3f) ic.readSavable("startVelocity", Vector3f.ZERO.clone()); 59 velocityVariation = ic.readFloat("variation", 0.2f); 60 } 61 62 @Override 63 public ParticleInfluencer clone() { 64 try { 65 DefaultParticleInfluencer clone = (DefaultParticleInfluencer) super.clone(); 66 clone.startVelocity = startVelocity.clone(); 67 return clone; 68 } catch (CloneNotSupportedException e) { 69 throw new AssertionError(); 70 } 71 } 72 73 @Override 74 public void setInitialVelocity(Vector3f initialVelocity) { 75 this.startVelocity.set(initialVelocity); 76 } 77 78 @Override 79 public Vector3f getInitialVelocity() { 80 return startVelocity; 81 } 82 83 @Override 84 public void setVelocityVariation(float variation) { 85 this.velocityVariation = variation; 86 } 87 88 @Override 89 public float getVelocityVariation() { 90 return velocityVariation; 91 } 92 } 93
