/*
* Copyright (c) 2009-2012 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
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.effect.influencers;
import com.jme3.effect.Particle;
import com.jme3.effect.shapes.EmitterShape;
import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.math.FastMath;
import com.jme3.math.Matrix3f;
import java.io.IOException;
/**
* This influencer calculates initial velocity with the use of the emitter's shape.
* @author Marcin Roguski (Kaelthas)
*/
public class NewtonianParticleInfluencer extends DefaultParticleInfluencer {
/** Normal to emitter's shape factor. */
protected float normalVelocity;
/** Emitter's surface tangent factor. */
protected float surfaceTangentFactor;
/** Emitters tangent rotation factor. */
protected float surfaceTangentRotation;
/**
* Constructor. Sets velocity variation to 0.0f.
*/
public NewtonianParticleInfluencer() {
this.velocityVariation = 0.0f;
}
@Override
public void influenceParticle(Particle particle, EmitterShape emitterShape) {
emitterShape.getRandomPointAndNormal(particle.position, particle.velocity);
// influencing the particle's velocity
if (surfaceTangentFactor == 0.0f) {
particle.velocity.multLocal(normalVelocity);
} else {
// calculating surface tangent (velocity contains the 'normal' value)
temp.set(particle.velocity.z * surfaceTangentFactor, particle.velocity.y * surfaceTangentFactor, -particle.velocity.x * surfaceTangentFactor);
if (surfaceTangentRotation != 0.0f) {// rotating the tangent
Matrix3f m = new Matrix3f();
m.fromAngleNormalAxis(FastMath.PI * surfaceTangentRotation, particle.velocity);
temp = m.multLocal(temp);
}
// applying normal factor (this must be done first)
particle.velocity.multLocal(normalVelocity);
// adding tangent vector
particle.velocity.addLocal(temp);
}
if (velocityVariation != 0.0f) {
this.applyVelocityVariation(particle);
}
}
/**
* This method returns the normal velocity factor.
* @return the normal velocity factor
*/
public float getNormalVelocity() {
return normalVelocity;
}
/**
* This method sets the normal velocity factor.
* @param normalVelocity
* the normal velocity factor
*/
public void setNormalVelocity(float normalVelocity) {
this.normalVelocity = normalVelocity;
}
/**
* This method sets the surface tangent factor.
* @param surfaceTangentFactor
* the surface tangent factor
*/
public void setSurfaceTangentFactor(float surfaceTangentFactor) {
this.surfaceTangentFactor = surfaceTangentFactor;
}
/**
* This method returns the surface tangent factor.
* @return the surface tangent factor
*/
public float getSurfaceTangentFactor() {
return surfaceTangentFactor;
}
/**
* This method sets the surface tangent rotation factor.
* @param surfaceTangentRotation
* the surface tangent rotation factor
*/
public void setSurfaceTangentRotation(float surfaceTangentRotation) {
this.surfaceTangentRotation = surfaceTangentRotation;
}
/**
* This method returns the surface tangent rotation factor.
* @return the surface tangent rotation factor
*/
public float getSurfaceTangentRotation() {
return surfaceTangentRotation;
}
@Override
protected void applyVelocityVariation(Particle particle) {
temp.set(FastMath.nextRandomFloat() * velocityVariation, FastMath.nextRandomFloat() * velocityVariation, FastMath.nextRandomFloat() * velocityVariation);
particle.velocity.addLocal(temp);
}
@Override
public ParticleInfluencer clone() {
NewtonianParticleInfluencer result = new NewtonianParticleInfluencer();
result.normalVelocity = normalVelocity;
result.initialVelocity = initialVelocity;
result.velocityVariation = velocityVariation;
result.surfaceTangentFactor = surfaceTangentFactor;
result.surfaceTangentRotation = surfaceTangentRotation;
return result;
}
@Override
public void write(JmeExporter ex) throws IOException {
super.write(ex);
OutputCapsule oc = ex.getCapsule(this);
oc.write(normalVelocity, "normalVelocity", 0.0f);
oc.write(surfaceTangentFactor, "surfaceTangentFactor", 0.0f);
oc.write(surfaceTangentRotation, "surfaceTangentRotation", 0.0f);
}
@Override
public void read(JmeImporter im) throws IOException {
super.read(im);
InputCapsule ic = im.getCapsule(this);
normalVelocity = ic.readFloat("normalVelocity", 0.0f);
surfaceTangentFactor = ic.readFloat("surfaceTangentFactor", 0.0f);
surfaceTangentRotation = ic.readFloat("surfaceTangentRotation", 0.0f);
}
}