Scry3DFunc.java

/*
  JWildfire - an image and animation processor written in Java 
  Copyright (C) 1995-2011 Andreas Maschke

  This is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser 
  General Public License as published by the Free Software Foundation; either version 2.1 of the 
  License, or (at your option) any later version.
 
  This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without 
  even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License along with this software; 
  if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jwildfire.create.tina.variation;

import static org.jwildfire.base.mathlib.MathLib.EPSILON;
import static org.jwildfire.base.mathlib.MathLib.atan2;
import static org.jwildfire.base.mathlib.MathLib.sqr;
import static org.jwildfire.base.mathlib.MathLib.sqrt;

import org.jwildfire.create.tina.base.XForm;
import org.jwildfire.create.tina.base.XYZPoint;

public class Scry3DFunc extends SimpleVariationFunc {
  private static final long serialVersionUID = 1L;

  @Override
  public void transform(FlameTransformationContext pContext, XForm pXForm, XYZPoint pAffineTP, XYZPoint pVarTP, double pAmount) {
    /* scry_3D by Larry Berlin, http://aporev.deviantart.com/art/New-3D-Plugins-136484533?q=gallery%3Aaporev%2F8229210&qo=22 */
    double inv = 1.0 / (pAmount + EPSILON);
    double t = sqr(pAffineTP.x) + sqr(pAffineTP.y) + sqr(pAffineTP.z);
    double r = 1.0 / (sqrt(t) * (t + inv));
    double Footzee, kikr;
    kikr = atan2(pAffineTP.y, pAffineTP.x);
    Footzee = pAffineTP.z;
    pVarTP.x += pAffineTP.x * r;
    pVarTP.y += pAffineTP.y * r;

    if (Footzee != 0.0) {
      pVarTP.z += Footzee * r;
    }
    else {
      Footzee = kikr;
      pVarTP.z += Footzee * r;
    }
  }

  @Override
  public String getName() {
    return "scry_3D";
  }

}