/* Copyright (c) 2012 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.model;
import se.llbit.chunky.resources.Texture;
import se.llbit.math.Quad;
import se.llbit.math.Ray;
import se.llbit.math.Vector3d;
import se.llbit.math.Vector4d;
@SuppressWarnings("javadoc")
public class TripwireModel {
private static final Quad[] wire = {
// north-south
new Quad(new Vector3d(8.25/16, 1/16., 1), new Vector3d(8.25/16, 1/16., 0),
new Vector3d(7.75/16, 1/16., 1), new Vector4d(0, 1, 14/16., 1)),
// east-west
new Quad(new Vector3d(1, 1/16., 7.75/16), new Vector3d(0, 1/16., 7.75/16),
new Vector3d(1, 1/16., 8.25/16), new Vector4d(0, 1, 14/16., 1)),
};
public static boolean intersection(Ray ray) {
int direction = (ray.currentMaterial >> 12) & 1;
ray.t = Double.POSITIVE_INFINITY;
Quad quad = wire[direction];
if (quad.intersect(ray)) {
ray.u *= 4;
ray.u -= (int) ray.u;
float[] color = Texture.tripwire.getColor(ray.u, ray.v);
if (color[3] > Ray.EPSILON) {
ray.color.set(color);
ray.n.set(quad.n);
ray.distance += ray.tNear;
ray.x.scaleAdd(ray.tNear, ray.d, ray.x);
return true;
}
}
return false;
}
}