Package se.llbit.chunky.model

Source Code of se.llbit.chunky.model.LadderModel

/* 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 LadderModel {
  protected static Quad[] quads = {
    // west
    new Quad(new Vector3d(1, 0, 0), new Vector3d(1, 0, 1),
        new Vector3d(1, 1, 0), new Vector4d(0, 1, 0, 1)),

    // east
    new Quad(new Vector3d(0, 0, 1), new Vector3d(0, 0, 0),
        new Vector3d(0, 1, 1), new Vector4d(1, 0, 0, 1)),

    // north
    new Quad(new Vector3d(1, 0, 1), new Vector3d(0, 0, 1),
        new Vector3d(1, 1, 1), new Vector4d(1, 0, 0, 1)),

    // south
    new Quad(new Vector3d(0, 0, 0), new Vector3d(1, 0, 0),
        new Vector3d(0, 1, 0), new Vector4d(0, 1, 0, 1)),


  };

  public static boolean intersect(Ray ray) {
    Quad quad = quads[ray.getBlockData() % 4];
    ray.t = Double.POSITIVE_INFINITY;
    if (quad.intersect(ray)) {
      float[] color = Texture.ladder.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;
  }
}
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