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/**
* Link.java
*
* Copyright (c) 2013-2016, F(X)yz
* 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 F(X)yz, any associated website, 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 F(X)yz 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 org.fxyz3d.shapes.complex.cloth;
import java.util.logging.Logger;
import org.fxyz3d.geometry.Point3D;
/**
*
* @author Jason Pollastrini aka jdub1581
*/
public class Link implements Constraint {
private static final Logger log = Logger.getLogger(Link.class.getName());
private final double distance, stiffness, damping = 0.75;
private final WeightedPoint p1, p2;
public Link(WeightedPoint p1, WeightedPoint p2, double distance, double stiffness) {
this.p1 = p1;
this.p2 = p2;
this.distance = distance;
this.stiffness = stiffness;
}
/* Option 2
// Pseudo-code to satisfy (C2)
delta = x2-x1;
deltalength = sqrt(delta*delta);
diff = (deltalength-restlength)
/(deltalength*(invmass1+invmass2));
x1 -= invmass1*delta*diff;
x2 += invmass2*delta*diff;
*/
@Override
public void solve() {
//calculate the distance between the two PointMasss
Point3D diff = new Point3D(
p1.getPosition().x - p2.getPosition().x,
p1.getPosition().y - p2.getPosition().y,
p1.getPosition().z - p2.getPosition().z
);
double d = diff.magnitude();
double difference =(distance - d) / d;
double im1 = 1 / p1.getMass();
double im2 = 1 / p2.getMass();
double scalarP1 = (im1 / (im1 + im2)) * stiffness;
double scalarP2 = stiffness - scalarP1;
synchronized (this) {
p1.position.x += ((float)(diff.x * scalarP1 * difference));
p1.position.y += ((float)(diff.y * scalarP1 * difference));
p1.position.z += ((float)(diff.z * scalarP1 * difference));
p2.position.x -= ((float)(diff.x * scalarP2 * difference));
p2.position.y -= ((float)(diff.y * scalarP2 * difference));
p2.position.z -= ((float)(diff.z * scalarP2 * difference));
}
}
public WeightedPoint getAnchorPoint() {
return p1;
}
public WeightedPoint getAttachedPoint() {
return p2;
}
@Override
public String toString() {
return "PointLink{" + "distance=" + distance + ", stiffness=" + stiffness + ", p1=" + p1 + ", p2=" + p2 + '}';
}
}
