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

源代码

```
package jmetest.TutorialGuide;
```
```
import java.net.URL;
```
```
import com.jme.app.SimpleGame;
```
```
import com.jme.bounding.BoundingBox;
```

import com.jme.bounding.BoundingSphere;

```
import com.jme.image.Texture;
```
```
import com.jme.light.PointLight;
```
```
import com.jme.math.Vector3f;
```
```
import com.jme.renderer.ColorRGBA;
```
```
import com.jme.scene.Node;
```
```
import com.jme.scene.shape.Box;
```
```
import com.jme.scene.shape.Sphere;
```
```
import com.jme.scene.state.LightState;
```

import com.jme.scene.state.MaterialState;

import com.jme.scene.state.TextureState;

```
import com.jme.util.TextureManager;
```
```
/**
```
```
 * Started Date: Jul 20, 2004
```
```
 *
```

 * Demonstrates using RenderStates with jME.

```
 * 
```
```
 * @author Jack Lindamood
```
```
 */
```

public class HelloStates extends SimpleGame {

    public static void main(String[] args) {

        HelloStates app = new HelloStates();

        app.setConfigShowMode(ConfigShowMode.AlwaysShow);

```
        app.start();
```
```
    }
```
```
    protected void simpleInitGame() {
```

        // Create our objects.  Nothing new here.

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

        b.setModelBound(new BoundingBox());

```
        b.updateModelBound();
```

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

        s.setModelBound(new BoundingSphere());

```
        s.updateModelBound();
```

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

        // 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");

```
        // 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);
```
```
        // Get a MaterialState
```

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

        // Give the MaterialState an emissive tint

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

```
        // 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);
```

        // Signal that b should use renderstate ts

```
        b.setRenderState(ts);
```

        // Signal that n should use renderstate ms

```
        n.setRenderState(ms);
```

        // Detach all the default lights made by SimpleGame

```
        lightState.detachAll();
```

        // Make my light effect everything below node n

```
        n.setRenderState(ls);
```

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

```
        n.attachChild(b);
```
```
        n.attachChild(s);
```
```
        rootNode.attachChild(n);
```
```
    }
```
```
}
```

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);

posted on 2009-09-25 12:26 飞飞狐阅读(221) 评论(0) 编辑收藏举报

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