/**
* 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.example.basic;
import java.util.ArrayList;
import java.util.List;
import com.ardor3d.bounding.BoundingBox;
import com.ardor3d.example.ExampleBase;
import com.ardor3d.example.Purpose;
import com.ardor3d.image.Texture;
import com.ardor3d.math.MathUtils;
import com.ardor3d.math.Matrix3;
import com.ardor3d.math.Vector3;
import com.ardor3d.renderer.state.MaterialState;
import com.ardor3d.renderer.state.MaterialState.ColorMaterial;
import com.ardor3d.renderer.state.TextureState;
import com.ardor3d.scenegraph.Mesh;
import com.ardor3d.scenegraph.shape.Box;
import com.ardor3d.scenegraph.shape.Sphere;
import com.ardor3d.util.ReadOnlyTimer;
import com.ardor3d.util.TextureManager;
/**
* A demonstration of the MathUtils.matrixLookAt function, which constructs a rotation matrix used to orient a source
* position to a given target position.
*/
@Purpose(htmlDescriptionKey = "com.ardor3d.example.basic.MatrixLookAtExample", //
thumbnailPath = "com/ardor3d/example/media/thumbnails/basic_MatrixLookAtExample.jpg", //
maxHeapMemory = 64)
public class MatrixLookAtExample extends ExampleBase {
private Mesh targetMesh;
private final List<Mesh> boxes = new ArrayList<Mesh>();
private double time = 0.0;
private final Vector3 at = new Vector3(0.0, 5.0, 10.0);
private final Vector3 up = new Vector3(0.0, 1.0, 0.0);
private final Matrix3 rotationMatrix = new Matrix3();
public static void main(final String[] args) {
start(MatrixLookAtExample.class);
}
@Override
protected void updateExample(final ReadOnlyTimer timer) {
time += timer.getTimePerFrame();
at.set(Math.sin(time) * 20, Math.cos(time * 1.4) * 20, 0.0);
targetMesh.setTranslation(at);
for (final Mesh mesh : boxes) {
MathUtils.matrixLookAt(mesh.getWorldTranslation(), at, up, rotationMatrix);
mesh.setRotation(rotationMatrix);
}
}
@Override
protected void initExample() {
_canvas.setTitle("Matrix LookAt Test");
_canvas.getCanvasRenderer().getCamera().setLocation(new Vector3(0, 0, 140));
final Box box = new Box("Box", new Vector3(), 1, 1, 4);
box.setModelBound(new BoundingBox());
box.setRandomColors();
targetMesh = new Sphere("Target", 8, 8, 2);
// update the default bounding sphere
targetMesh.updateModelBound();
_root.attachChild(targetMesh);
targetMesh.setRandomColors();
for (int x = 0; x < 10; x++) {
for (int y = 0; y < 10; y++) {
final Mesh sm = box.makeCopy(true);
sm.setTranslation((x - 5.0) * 10.0, (y - 5.0) * 10.0, -10.0);
_root.attachChild(sm);
boxes.add(sm);
}
}
final TextureState ts = new TextureState();
ts.setEnabled(true);
ts.setTexture(TextureManager.load("images/ardor3d_white_256.jpg", Texture.MinificationFilter.Trilinear, true));
final MaterialState ms = new MaterialState();
ms.setColorMaterial(ColorMaterial.Diffuse);
_root.setRenderState(ms);
_root.setRenderState(ts);
}
}