libgdx学习记录22——3d物体创建

libgdx是一个强大的游戏框架，不仅支持2d部分，同时还支持3d部分。

libgdx的3d部分投影主要通过PerspectiveCamera实现。

物体的显示过程：

1. 创建远景相机，角度一般设为67，并设置其位置、观看点、近距离和远距离。

2. 创建模型创建器，并创建出一个物体模型。之后通过模型创建出对应的实例。

3. 创建环境和相机控制器。

4. render函数中进行渲染绘制。

具体实例：

 package com.fxb.newtest;

 import com.badlogic.gdx.ApplicationAdapter;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.GL10;
 import com.badlogic.gdx.graphics.PerspectiveCamera;
 import com.badlogic.gdx.graphics.VertexAttributes.Usage;
 import com.badlogic.gdx.graphics.g3d.Environment;
 import com.badlogic.gdx.graphics.g3d.Material;
 import com.badlogic.gdx.graphics.g3d.Model;
 import com.badlogic.gdx.graphics.g3d.ModelBatch;
 import com.badlogic.gdx.graphics.g3d.ModelInstance;
 import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute;
 import com.badlogic.gdx.graphics.g3d.environment.DirectionalLight;
 import com.badlogic.gdx.graphics.g3d.utils.CameraInputController;
 import com.badlogic.gdx.graphics.g3d.utils.ModelBuilder;

 public class Lib022_3dTest extends ApplicationAdapter{

     PerspectiveCamera camera;
     Model model;
     ModelInstance instance;
     ModelBatch modelBatch;
     Environment environment;

     CameraInputController cameraController;

     @Override
     public void create() {
         // TODO Auto-generated method stub
         super.create();

         camera = new PerspectiveCamera( 67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight() );
         camera.position.set( 10, 10, 10 );
         camera.lookAt( 0, 0, 0 );
         camera.near = 1f;
         camera.far = 300f;
         camera.update();

         ModelBuilder modelBuilder = new ModelBuilder();
         model = modelBuilder.createBox( 5f, 5f, 5f, new Material( ColorAttribute.createDiffuse(Color.GREEN) ), Usage.Position | Usage.Normal );
         instance = new ModelInstance( model );
         modelBatch = new ModelBatch();

         environment = new Environment();
         environment.set( new ColorAttribute( ColorAttribute.AmbientLight, 0.4f, 0.4f, 0.4f, 1f ) );
         environment.add( new DirectionalLight().set( 0.8f, 0.8f, 0.8f, -1f, -0.8f, -0.2f ) );

         cameraController = new CameraInputController( camera );
         Gdx.input.setInputProcessor( cameraController );
     }

     @Override
     public void render() {
         // TODO Auto-generated method stub
         super.render();
         Gdx.gl.glViewport( 0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight() );
         Gdx.gl.glClear( GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT );

         cameraController.update();
         modelBatch.begin( camera );
         //modelBatch.render( instance );
         modelBatch.render( instance, environment );
         modelBatch.end();

     }

     @Override
     public void dispose() {
         // TODO Auto-generated method stub
         modelBatch.dispose();
         model.dispose();
         super.dispose();
     }

 }

运行结果：

拖拽物体可以变换角度和方向