SignPostModel.java example

Explorer
chunky-master
/* 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.Vector3;
import se.llbit.math.Vector4;

/**
 * A generic block.
 *
 * @author Jesper Öqvist <jesper@llbit.se>
 */
public class SignPostModel {
  // facing south
  protected static Quad[] sides = {
      // front
      new Quad(new Vector3(0, .5, 9 / 16.), new Vector3(1, .5, 9 / 16.),
          new Vector3(0, 1, 9 / 16.), new Vector4(2 / 64., 26 / 64., 18 / 32., 30 / 32.)),

      // back
      new Quad(new Vector3(1, .5, 7 / 16.), new Vector3(0, .5, 7 / 16.),
          new Vector3(1, 1, 7 / 16.), new Vector4(28 / 64., 52 / 64., 18 / 32., 30 / 32.)),

      // left
      new Quad(new Vector3(0, .5, 7 / 16.), new Vector3(0, .5, 9 / 16.),
          new Vector3(0, 1, 7 / 16.), new Vector4(0, 2 / 64., 18 / 32., 30 / 32.)),

      // right
      new Quad(new Vector3(1, .5, 9 / 16.), new Vector3(1, .5, 7 / 16.),
          new Vector3(1, 1, 9 / 16.), new Vector4(26 / 64., 28 / 64., 18 / 32., 30 / 32.)),

      // top
      new Quad(new Vector3(1, 1, 7 / 16.), new Vector3(0, 1, 7 / 16.),
          new Vector3(1, 1, 9 / 16.), new Vector4(2 / 64., 26 / 64., 1, 30 / 32.)),

      // bottom
      new Quad(new Vector3(0, .5, 7 / 16.), new Vector3(1, .5, 7 / 16.),
          new Vector3(0, .5, 9 / 16.), new Vector4(26 / 64., 50 / 64., 1, 30 / 32.)),

      // post front
      new Quad(new Vector3(7 / 16., 0, 9 / 16.), new Vector3(9 / 16., 0, 9 / 16.),
          new Vector3(7 / 16., .5, 9 / 16.), new Vector4(2 / 64., 4 / 64., 2 / 32., 16 / 32.)),

      // post back
      new Quad(new Vector3(9 / 16., 0, 7 / 16.), new Vector3(7 / 16., 0, 7 / 16.),
          new Vector3(9 / 16., .5, 7 / 16.), new Vector4(4 / 64., 6 / 64., 2 / 32., 16 / 32.)),

      // post left
      new Quad(new Vector3(7 / 16., 0, 7 / 16.), new Vector3(7 / 16., 0, 9 / 16.),
          new Vector3(7 / 16., .5, 7 / 16.), new Vector4(0, 2 / 64., 2 / 32., 16 / 32.)),

      // post right
      new Quad(new Vector3(9 / 16., 0, 9 / 16.), new Vector3(9 / 16., 0, 7 / 16.),
          new Vector3(9 / 16., .5, 9 / 16.), new Vector4(6 / 64., 8 / 64., 2 / 32., 16 / 32.)),

      // post bottom
      new Quad(new Vector3(7 / 16., 0, 7 / 16.), new Vector3(9 / 16., 0, 7 / 16.),
          new Vector3(7 / 16., 0, 9 / 16.), new Vector4(4 / 64., 6 / 64., 16 / 32., 18 / 32.)),

  };

  private static final Quad[][] rot = new Quad[16][];

  static {
    // Rotate the sign post to face the correct direction.
    rot[0] = sides;
    for (int i = 1; i < 16; ++i) {
      rot[i] = Model.rotateY(sides, -i * Math.PI / 8);
    }
  }

  public static boolean intersect(Ray ray) {
    boolean hit = false;
    int angle = ray.getBlockData() & 0xF;
    ray.t = Double.POSITIVE_INFINITY;
    for (int i = 0; i < sides.length; ++i) {
      Quad side = rot[angle][i];
      if (side.intersect(ray)) {
        Texture.signPost.getColor(ray);
        ray.n.set(side.n);
        ray.t = ray.tNext;
        hit = true;
      }
    }
    if (hit) {
      ray.color.w = 1;
      ray.distance += ray.t;
      ray.o.scaleAdd(ray.t, ray.d);
    }
    return hit;
  }
}