/* Copyright (c) 2014 Jesper Öqvist <jesper@llbit.se>
*
* This file is part of Chunky.
*
* Chunky is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Chunky 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Chunky. If not, see <http://www.gnu.org/licenses/>.
*/
package se.llbit.chunky.renderer.projection;
import java.util.Random;
import org.apache.commons.math3.util.FastMath;
import se.llbit.math.QuickMath;
import se.llbit.math.Vector3;
public class FisheyeProjector implements Projector {
protected final double fov;
public FisheyeProjector(double fov) {
this.fov = fov;
}
@Override public void apply(double x, double y, Random random, Vector3 o, Vector3 d) {
apply(x, y, o, d);
}
@Override public void apply(double x, double y, Vector3 o, Vector3 d) {
double ay = QuickMath.degToRad(y * fov);
double ax = QuickMath.degToRad(x * fov);
double avSquared = ay * ay + ax * ax;
double angleFromCenter = FastMath.sqrt(avSquared);
double dz = FastMath.cos(angleFromCenter);
double dv = FastMath.sin(angleFromCenter);
double dy, dx;
if (angleFromCenter == 0) {
dx = dy = 0;
} else {
dx = dv * (ax / angleFromCenter);
dy = dv * (ay / angleFromCenter);
}
o.set(0, 0, 0);
d.set(dx, dy, dz);
}
@Override public double getMinRecommendedFoV() {
return 1;
}
@Override public double getMaxRecommendedFoV() {
return 180;
}
@Override public double getDefaultFoV() {
return 120;
}
}