JME基础教程代码分析2

package com.hello;

import com.jme3.app.SimpleApplication;

import com.jme3.material.Material;

import com.jme3.math.Vector3f;

import com.jme3.scene.Geometry;

import com.jme3.scene.shape.Box;

import com.jme3.math.ColorRGBA;

import com.jme3.scene.Node;

/** Sample 2 - How to use nodes as handles to manipulate objects in the scene graph.

 * You can rotate, translate, and scale objects by manipulating their parent nodes.

 * The Root Node is special: Only what is attached to the Root Node appears in the scene. */

public class HelloNode extends SimpleApplication {

    public static void main(String[] args){

        HelloNode app = new HelloNode();

        app.start();

    }

    @Override

    public void simpleInitApp() {

        // create a blue box at coordinates (1,-1,1)

     //在坐标(1,-1,1)上的蓝色box

        Box box1 = new Box( new Vector3f(1,-1,1), 1,1,1);

        Geometry blue = new Geometry("Box", box1);

        Material mat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

        mat1.setColor("Color", ColorRGBA.Blue);

        blue.setMaterial(mat1);

        // create a red box straight above the blue one at (1,3,1)

        //在坐标(1,3,1)上的红色box

        Box box2 = new Box( new Vector3f(1,3,1), 1,1,1);

        Geometry red = new Geometry("Box", box2);

        Material mat2 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");

        mat2.setColor("Color", ColorRGBA.Red);

        red.setMaterial(mat2);

        // create a pivot node at (0,0,0) and attach it to root

        //在(0,0,0)上创建的一个新的节点，并附加到根节点

        Node pivot = new Node("pivot");

        rootNode.attachChild(pivot);

        // attach the two boxes to the *pivot* node!

        //两个box附加到pivot节点

        pivot.attachChild(blue);

        pivot.attachChild(red);

        // rotate pivot node: Both boxes have rotated!

        //两个box都旋转，嘿嘿，这就是父节点的作用

        pivot.rotate( 0.4f , 0.4f , 0.0f );

    }

}

注：还有关于剔除渲染的操作，也是对节点作用的说明