Android Open Source - jmini3d Utils

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License

The source code is released under:

Copyright 2012 Mobialia http://www.mobialia.com/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to ...

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Java Source Code

package jmini3d;
/*www .j  a va  2s  .  c o  m*/
public class Utils {
  public static float PI = (float) Math.PI;

  public static void getRay(Camera camera, int x, int y, Vector3 ray) {
    int[] viewport = {0, 0, camera.getWidth(), camera.getHeight()};

    gluUnProject(x, camera.getHeight() - y, 0.9f, camera.perspectiveMatrix, viewport, ray);

    // Ray vector
    ray.x -= camera.getPosition().x;
    ray.y -= camera.getPosition().y;
    ray.z -= camera.getPosition().z;
  }

  public static boolean gluUnProject(float winx, float winy, float winz, final float[] perspectiveMatrix,
                     final int[] viewport, Vector3 outCoord) {
    float[] finalMatrix = new float[16];
    float[] in = new float[4];
    float[] out = new float[4];

    // TODO cache
    if (!MatrixUtils.invert(perspectiveMatrix, finalMatrix)) {
      return false;
    }

    in[0] = winx;
    in[1] = winy;
    in[2] = winz;
    in[3] = 1.0f;

    // Map x and y to 0..1
    in[0] = (in[0] - viewport[0]) / viewport[2];
    in[1] = (in[1] - viewport[1]) / viewport[3];

    // Map to range -1..1
    in[0] = in[0] * 2 - 1;
    in[1] = in[1] * 2 - 1;
    in[2] = in[2] * 2 - 1;

    MatrixUtils.multiplyVector(finalMatrix, in, out);
    if (out[3] == 0) {
      return false;
    }
    out[0] /= out[3];
    out[1] /= out[3];
    out[2] /= out[3];

    outCoord.setAll(out[0], out[1], out[2]);
    return true;
  }

  public static float p(float n, float x) {
    return (2f * n - 1f) / (2f * x);
  }

  public static float p256(float n) {
    return (2f * n - 1f) / (2f * 256f);
  }

  public static float p512(float n) {
    return (2f * n - 1f) / (2f * 512f);
  }

  public static float p1024(float n) {
    return (2f * n - 1f) / (2f * 1024f);
  }

  public static float p2048(float n) {
    return (2f * n - 1f) / (2f * 2048f);
  }

  public static float p4096(float n) {
    return (2f * n - 1f) / (2f * 4096f);
  }

}

Java Source Code List