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32 
33 package jme3test.collision;
34 
35 import com.jme3.app.SimpleApplication;
36 import com.jme3.collision.CollisionResult;
37 import com.jme3.collision.CollisionResults;
38 import com.jme3.light.DirectionalLight;
39 import com.jme3.material.Material;
40 import com.jme3.math.ColorRGBA;
41 import com.jme3.math.Quaternion;
42 import com.jme3.math.Ray;
43 import com.jme3.math.Vector3f;
44 import com.jme3.scene.Geometry;
45 import com.jme3.scene.Node;
46 import com.jme3.scene.Spatial;
47 import com.jme3.scene.debug.Arrow;
48 import com.jme3.scene.shape.Box;
49 
50 public class TestMousePick extends SimpleApplication {
51 
main(String[] args)52     public static void main(String[] args) {
53         TestMousePick app = new TestMousePick();
54         app.start();
55     }
56 
57     Node shootables;
58     Geometry mark;
59 
60     @Override
simpleInitApp()61     public void simpleInitApp() {
62         flyCam.setEnabled(false);
63         initMark();       // a red sphere to mark the hit
64 
65         /** create four colored boxes and a floor to shoot at: */
66         shootables = new Node("Shootables");
67         rootNode.attachChild(shootables);
68         shootables.attachChild(makeCube("a Dragon", -2f, 0f, 1f));
69         shootables.attachChild(makeCube("a tin can", 1f, -2f, 0f));
70         shootables.attachChild(makeCube("the Sheriff", 0f, 1f, -2f));
71         shootables.attachChild(makeCube("the Deputy", 1f, 0f, -4f));
72         shootables.attachChild(makeFloor());
73         shootables.attachChild(makeCharacter());
74     }
75 
76     @Override
simpleUpdate(float tpf)77     public void simpleUpdate(float tpf){
78         Vector3f origin    = cam.getWorldCoordinates(inputManager.getCursorPosition(), 0.0f);
79         Vector3f direction = cam.getWorldCoordinates(inputManager.getCursorPosition(), 0.3f);
80         direction.subtractLocal(origin).normalizeLocal();
81 
82         Ray ray = new Ray(origin, direction);
83         CollisionResults results = new CollisionResults();
84         shootables.collideWith(ray, results);
85 //        System.out.println("----- Collisions? " + results.size() + "-----");
86 //        for (int i = 0; i < results.size(); i++) {
87 //            // For each hit, we know distance, impact point, name of geometry.
88 //            float dist = results.getCollision(i).getDistance();
89 //            Vector3f pt = results.getCollision(i).getWorldContactPoint();
90 //            String hit = results.getCollision(i).getGeometry().getName();
91 //            System.out.println("* Collision #" + i);
92 //            System.out.println("  You shot " + hit + " at " + pt + ", " + dist + " wu away.");
93 //        }
94         if (results.size() > 0) {
95             CollisionResult closest = results.getClosestCollision();
96             mark.setLocalTranslation(closest.getContactPoint());
97 
98             Quaternion q = new Quaternion();
99             q.lookAt(closest.getContactNormal(), Vector3f.UNIT_Y);
100             mark.setLocalRotation(q);
101 
102             rootNode.attachChild(mark);
103         } else {
104             rootNode.detachChild(mark);
105         }
106     }
107 
108     /** A cube object for target practice */
makeCube(String name, float x, float y, float z)109     protected Geometry makeCube(String name, float x, float y, float z) {
110         Box box = new Box(new Vector3f(x, y, z), 1, 1, 1);
111         Geometry cube = new Geometry(name, box);
112         Material mat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
113         mat1.setColor("Color", ColorRGBA.randomColor());
114         cube.setMaterial(mat1);
115         return cube;
116     }
117 
118     /** A floor to show that the "shot" can go through several objects. */
makeFloor()119     protected Geometry makeFloor() {
120         Box box = new Box(new Vector3f(0, -4, -5), 15, .2f, 15);
121         Geometry floor = new Geometry("the Floor", box);
122         Material mat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
123         mat1.setColor("Color", ColorRGBA.Gray);
124         floor.setMaterial(mat1);
125         return floor;
126     }
127 
128     /** A red ball that marks the last spot that was "hit" by the "shot". */
initMark()129     protected void initMark() {
130         Arrow arrow = new Arrow(Vector3f.UNIT_Z.mult(2f));
131         arrow.setLineWidth(3);
132 
133         //Sphere sphere = new Sphere(30, 30, 0.2f);
134         mark = new Geometry("BOOM!", arrow);
135         //mark = new Geometry("BOOM!", sphere);
136         Material mark_mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
137         mark_mat.setColor("Color", ColorRGBA.Red);
138         mark.setMaterial(mark_mat);
139     }
140 
makeCharacter()141     protected Spatial makeCharacter() {
142         // load a character from jme3test-test-data
143         Spatial golem = assetManager.loadModel("Models/Oto/Oto.mesh.xml");
144         golem.scale(0.5f);
145         golem.setLocalTranslation(-1.0f, -1.5f, -0.6f);
146 
147         // We must add a light to make the model visible
148         DirectionalLight sun = new DirectionalLight();
149         sun.setDirection(new Vector3f(-0.1f, -0.7f, -1.0f).normalizeLocal());
150         golem.addLight(sun);
151         return golem;
152     }
153 }
154