7、示例4：Hello States

1 示例4：Hello States

本例介绍了MaterialState, TextureState, LightState, and PointLight等状态的使用。

1.1 源代码

隐藏行号 复制代码 ？ 源代码

1. package jmetest.TutorialGuide;
   

3. import java.net.URL;
   

5. import com.jme.app.SimpleGame;
   

6. import com.jme.bounding.BoundingBox;
   

7. import com.jme.bounding.BoundingSphere;
   

8. import com.jme.image.Texture;
   

9. import com.jme.light.PointLight;
   

10. import com.jme.math.Vector3f;
    

11. import com.jme.renderer.ColorRGBA;
    

12. import com.jme.scene.Node;
    

13. import com.jme.scene.shape.Box;
    

14. import com.jme.scene.shape.Sphere;
    

15. import com.jme.scene.state.LightState;
    

16. import com.jme.scene.state.MaterialState;
    

17. import com.jme.scene.state.TextureState;
    

18. import com.jme.util.TextureManager;
    

21. /**
    

22.  * Started Date: Jul 20, 2004
    
    
    

23.  *
    

24.  * Demonstrates using RenderStates with jME.
    

25.  * 
    

26.  * @author Jack Lindamood
    

27.  */
    

28. public class HelloStates extends SimpleGame {
    

29.     public static void main(String[] args) {
    

30.         HelloStates app = new HelloStates();
    

31.         app.setConfigShowMode(ConfigShowMode.AlwaysShow);
    

32.         app.start();
    

33.     }
    

35.     protected void simpleInitGame() {
    

37.         // Create our objects.  Nothing new here.
    

38.         Box b=new Box("my box",new Vector3f(1,1,1),new Vector3f(2,2,2));
    

39.         b.setModelBound(new BoundingBox());
    

40.         b.updateModelBound();
    

41.         Sphere s=new Sphere("My sphere",15,15,1);
    

42.         s.setModelBound(new BoundingSphere());
    

43.         s.updateModelBound();
    

44.         Node n=new Node("My root node");
    

46.         // Get a URL that points to the texture we're going to load
    

47.         URL monkeyLoc;
    

48.         monkeyLoc=HelloStates.class.getClassLoader().getResource("jmetest/data/images/Monkey.jpg");
    

50.         // Get a TextureState
    

51.         TextureState ts=display.getRenderer().createTextureState();
    

52.         // Use the TextureManager to load a texture
    

53.         Texture t=TextureManager.loadTexture(monkeyLoc,Texture.MinificationFilter.BilinearNearestMipMap,Texture.MagnificationFilter.Bilinear);
    

54.         // Assign the texture to the TextureState
    

55.         ts.setTexture(t);
    

57.         // Get a MaterialState
    

58.         MaterialState ms=display.getRenderer().createMaterialState();
    

59.         // Give the MaterialState an emissive tint
    

60.         ms.setEmissive(new ColorRGBA(0f,.2f,0f,1));
    

62.         // Create a point light
    

63.         PointLight l=new PointLight();
    

64.         // Give it a location
    

65.         l.setLocation(new Vector3f(0,10,5));
    

66.         // Make it a red light
    

67.         l.setDiffuse(ColorRGBA.red.clone());
    

68.         // Enable it
    

69.         l.setEnabled(true);
    

71.         // Create a LightState to put my light in
    

72.         LightState ls=display.getRenderer().createLightState();
    

73.         // Attach the light
    

74.         ls.attach(l);
    

77.         // Signal that b should use renderstate ts
    

78.         b.setRenderState(ts);
    

79.         // Signal that n should use renderstate ms
    

80.         n.setRenderState(ms);
    

81.         // Detach all the default lights made by SimpleGame
    

82.         lightState.detachAll();
    

83.         // Make my light effect everything below node n
    

84.         n.setRenderState(ls);
    

86.         // Attach b and s to n, and n to rootNode.
    

87.         n.attachChild(b);
    

88.         n.attachChild(s);
    

89.         rootNode.attachChild(n);
    

90.     }
    

91. }
    

 

1.2 详细说明

// Get a URL that points to the texture we're going to load

URL monkeyLoc; monkeyLoc=HelloStates.class.getClassLoader().getResource("jmetest/data/images/Monkey.jpg");

获取图片资源的路径。

// Get a TextureState

TextureState ts=display.getRenderer().createTextureState();

// Use the TextureManager to load a texture

Texture t=TextureManager.loadTexture(monkeyLoc,Texture.MinificationFilter.BilinearNearestMipMap,Texture.MagnificationFilter.Bilinear);

// Assign the texture to the TextureState

ts.setTexture(t);

// Signal that b should use renderstate ts

b.setRenderState(ts);

把立方体的六个面加载上图片。效果如图：

// Create a point light

PointLight l=new PointLight();

// Give it a location

l.setLocation(new Vector3f(0,10,5));

// Make it a red light

l.setDiffuse(ColorRGBA.red.clone());

// Enable it

l.setEnabled(true);

// Create a LightState to put my light in

LightState ls=display.getRenderer().createLightState();

// Attach the light

ls.attach(l);

这是设置一个点光源（代码rootNode.setLightCombineMode(LightCombineMode.Off);得去掉），效果如图：

将材质设为绿色：

// Get a MaterialState

MaterialState ms=display.getRenderer().createMaterialState();

// Give the MaterialState an emissive tint

ms.setEmissive(new ColorRGBA(0f,.2f,0f,1));

b.setRenderState(ms);