/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.scenegraph.shape;
import java.io.IOException;
import java.nio.FloatBuffer;
import com.ardor3d.math.MathUtils;
import com.ardor3d.math.Vector2;
import com.ardor3d.math.Vector3;
import com.ardor3d.scenegraph.IndexBufferData;
import com.ardor3d.scenegraph.Mesh;
import com.ardor3d.util.export.InputCapsule;
import com.ardor3d.util.export.OutputCapsule;
import com.ardor3d.util.geom.BufferUtils;
public class Dodecahedron extends Mesh {
private static final int NUM_POINTS = 20;
private static final int NUM_TRIS = 36;
private double _sideLength;
public Dodecahedron() {}
/**
* Creates an Dodecahedron (think of 12-sided dice) with center at the origin. The length of the sides will be as
* specified in sideLength.
*
* @param name
* The name of the octahedron.
* @param sideLength
* The length of each side of the octahedron.
*/
public Dodecahedron(final String name, final double sideLength) {
super(name);
_sideLength = sideLength;
// allocate vertices
_meshData.setVertexBuffer(BufferUtils.createVector3Buffer(NUM_POINTS));
_meshData.setNormalBuffer(BufferUtils.createVector3Buffer(NUM_POINTS));
_meshData.setTextureBuffer(BufferUtils.createVector2Buffer(NUM_POINTS), 0);
_meshData.setIndices(BufferUtils.createIndexBufferData(3 * NUM_TRIS, NUM_POINTS - 1));
setVertexData();
setNormalData();
setTextureData();
setIndexData();
}
private void setIndexData() {
final IndexBufferData<?> indices = _meshData.getIndices();
indices.rewind();
indices.put(0).put(8).put(9);
indices.put(0).put(9).put(4);
indices.put(0).put(4).put(16);
indices.put(0).put(12).put(13);
indices.put(0).put(13).put(1);
indices.put(0).put(1).put(8);
indices.put(0).put(16).put(17);
indices.put(0).put(17).put(2);
indices.put(0).put(2).put(12);
indices.put(8).put(1).put(18);
indices.put(8).put(18).put(5);
indices.put(8).put(5).put(9);
indices.put(12).put(2).put(10);
indices.put(12).put(10).put(3);
indices.put(12).put(3).put(13);
indices.put(16).put(4).put(14);
indices.put(16).put(14).put(6);
indices.put(16).put(6).put(17);
indices.put(9).put(5).put(15);
indices.put(9).put(15).put(14);
indices.put(9).put(14).put(4);
indices.put(6).put(11).put(10);
indices.put(6).put(10).put(2);
indices.put(6).put(2).put(17);
indices.put(3).put(19).put(18);
indices.put(3).put(18).put(1);
indices.put(3).put(1).put(13);
indices.put(7).put(15).put(5);
indices.put(7).put(5).put(18);
indices.put(7).put(18).put(19);
indices.put(7).put(11).put(6);
indices.put(7).put(6).put(14);
indices.put(7).put(14).put(15);
indices.put(7).put(19).put(3);
indices.put(7).put(3).put(10);
indices.put(7).put(10).put(11);
}
private void setTextureData() {
final Vector2 tex = new Vector2();
final Vector3 vert = new Vector3();
for (int i = 0; i < NUM_POINTS; i++) {
BufferUtils.populateFromBuffer(vert, _meshData.getVertexBuffer(), i);
if (Math.abs(vert.getZ()) < _sideLength) {
tex.setX(0.5 * (1.0 + Math.atan2(vert.getY(), vert.getX()) * MathUtils.INV_PI));
} else {
tex.setX(0.5);
}
tex.setY(Math.acos(vert.getZ() / _sideLength) * MathUtils.INV_PI);
_meshData.getTextureCoords(0).getBuffer().put((float) tex.getX()).put((float) tex.getY());
}
}
private void setNormalData() {
final Vector3 norm = new Vector3();
for (int i = 0; i < NUM_POINTS; i++) {
BufferUtils.populateFromBuffer(norm, _meshData.getVertexBuffer(), i);
norm.normalizeLocal();
BufferUtils.setInBuffer(norm, _meshData.getNormalBuffer(), i);
}
}
private void setVertexData() {
double fA = 1.0 / Math.sqrt(3.0f);
double fB = Math.sqrt((3.0 - Math.sqrt(5.0)) / 6.0);
double fC = Math.sqrt((3.0 + Math.sqrt(5.0)) / 6.0);
fA *= _sideLength;
fB *= _sideLength;
fC *= _sideLength;
final FloatBuffer vbuf = _meshData.getVertexBuffer();
vbuf.rewind();
vbuf.put((float) fA).put((float) fA).put((float) fA);
vbuf.put((float) fA).put((float) fA).put((float) -fA);
vbuf.put((float) fA).put((float) -fA).put((float) fA);
vbuf.put((float) fA).put((float) -fA).put((float) -fA);
vbuf.put((float) -fA).put((float) fA).put((float) fA);
vbuf.put((float) -fA).put((float) fA).put((float) -fA);
vbuf.put((float) -fA).put((float) -fA).put((float) fA);
vbuf.put((float) -fA).put((float) -fA).put((float) -fA);
vbuf.put((float) fB).put((float) fC).put(0.0f);
vbuf.put((float) -fB).put((float) fC).put(0.0f);
vbuf.put((float) fB).put((float) -fC).put(0.0f);
vbuf.put((float) -fB).put((float) -fC).put(0.0f);
vbuf.put((float) fC).put(0.0f).put((float) fB);
vbuf.put((float) fC).put(0.0f).put((float) -fB);
vbuf.put((float) -fC).put(0.0f).put((float) fB);
vbuf.put((float) -fC).put(0.0f).put((float) -fB);
vbuf.put(0.0f).put((float) fB).put((float) fC);
vbuf.put(0.0f).put((float) -fB).put((float) fC);
vbuf.put(0.0f).put((float) fB).put((float) -fC);
vbuf.put(0.0f).put((float) -fB).put((float) -fC);
}
@Override
public void write(final OutputCapsule capsule) throws IOException {
super.write(capsule);
capsule.write(_sideLength, "sideLength", 0);
}
@Override
public void read(final InputCapsule capsule) throws IOException {
super.read(capsule);
_sideLength = capsule.readInt("sideLength", 0);
}
}