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2  * Copyright (c) 2009-2010 jMonkeyEngine
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12  * * Redistributions in binary form must reproduce the above copyright
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31  */
32 
33 package jme3test.collision;
34 
35 import com.jme3.collision.CollisionResults;
36 import com.jme3.math.Ray;
37 import com.jme3.math.Vector2f;
38 import com.jme3.math.Vector3f;
39 import com.jme3.renderer.Camera;
40 import com.jme3.scene.Spatial;
41 import java.awt.FlowLayout;
42 import java.awt.image.BufferedImage;
43 import javax.swing.ImageIcon;
44 import javax.swing.JFrame;
45 import javax.swing.JLabel;
46 
47 public class RayTrace {
48 
49     private BufferedImage image;
50     private Camera cam;
51     private Spatial scene;
52     private CollisionResults results = new CollisionResults();
53     private JFrame frame;
54     private JLabel label;
55 
RayTrace(Spatial scene, Camera cam, int width, int height)56     public RayTrace(Spatial scene, Camera cam, int width, int height){
57         image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
58         this.scene = scene;
59         this.cam = cam;
60     }
61 
show()62     public void show(){
63         frame = new JFrame("HDR View");
64         label = new JLabel(new ImageIcon(image));
65         frame.getContentPane().add(label);
66         frame.setLayout(new FlowLayout());
67         frame.pack();
68         frame.setVisible(true);
69     }
70 
update()71     public void update(){
72         int w = image.getWidth();
73         int h = image.getHeight();
74 
75         float wr = (float) cam.getWidth()  / image.getWidth();
76         float hr = (float) cam.getHeight() / image.getHeight();
77 
78         scene.updateGeometricState();
79 
80         for (int y = 0; y < h; y++){
81             for (int x = 0; x < w; x++){
82                 Vector2f v = new Vector2f(x * wr,y * hr);
83                 Vector3f pos = cam.getWorldCoordinates(v, 0.0f);
84                 Vector3f dir = cam.getWorldCoordinates(v, 0.3f);
85                 dir.subtractLocal(pos).normalizeLocal();
86 
87                 Ray r = new Ray(pos, dir);
88 
89                 results.clear();
90                 scene.collideWith(r, results);
91                 if (results.size() > 0){
92                     image.setRGB(x, h - y - 1, 0xFFFFFFFF);
93                 }else{
94                     image.setRGB(x, h - y - 1, 0xFF000000);
95                 }
96             }
97         }
98 
99         label.repaint();
100     }
101 
102 }
103