libgdx之加载obj(3D文件)

原文链接：http://blog.csdn.net/cng1991/article/details/7293946

今天看了下libgdx，觉得加载3d模型的功能很炫。所以分享下代码。

首先用blender(开源的3D模型工具，百度即可搜到)新建一个工程,然后导出为cube.obj。最主要的是获取obj文件。将.obj文件放在android工程的assets/data目录下。然后搭建android下的libgdx环境，即导入架包。

然后编写代码：

package com.cng;




import android.os.Bundle;

import com.badlogic.gdx.ApplicationListener; 
import com.badlogic.gdx.Gdx; 
import com.badlogic.gdx.backends.android.AndroidApplication;
import com.badlogic.gdx.graphics.Color; 
import com.badlogic.gdx.graphics.GL10; 
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.Texture; 
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.BitmapFont; 
import com.badlogic.gdx.graphics.g2d.SpriteBatch; 
import com.badlogic.gdx.graphics.g2d.TextureRegion; 
import com.badlogic.gdx.graphics.g3d.loaders.ModelLoaderOld;
import com.badlogic.gdx.utils.ScreenUtils;




public class MyGameActivity extends AndroidApplication {
	 
	class MyGameListen  implements ApplicationListener
	{
		SpriteBatch batch;
		Texture texture;
		TextureRegion fbteRegion;
		BitmapFont font;
		PerspectiveCamera camera;
		Mesh mesh;
		Color clearColor=new Color(0.2f, 0.2f, 0.2f, 1);
		float angle;
		@Override
		public void create()
		{
			mesh=ModelLoaderOld.loadObj(Gdx.files.internal("data/cube.obj").read());
			texture=new Texture(Gdx.files.internal("data/badlogic.jpg"),true);
			texture.setFilter(TextureFilter.MipMap, TextureFilter.Linear);
			
			batch=new SpriteBatch();
			font=new BitmapFont();
			
			camera=new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
			camera.position.set(3, 3, 3);
			camera.direction.set(-1, -1, -1);
		}
		@Override
		public void dispose()
		{
			
		}

		@Override
		public void pause()
		{
			
		}

		@Override
		public void render()
		{
			GL10 gl=Gdx.graphics.getGL10();
			gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
			gl.glClearColor(clearColor.r, clearColor.g, clearColor.b, clearColor.a);
			gl.glClear(GL10.GL_COLOR_BUFFER_BIT|GL10.GL_DEPTH_BUFFER_BIT);
			gl.glEnable(GL10.GL_DEPTH_TEST);
			gl.glEnable(GL10.GL_TEXTURE_2D);
			
			camera.update();
			camera.apply(gl);
			angle+=45*Gdx.graphics.getDeltaTime();
			gl.glPushMatrix();
			gl.glRotatef(angle, 1, 0, 0);
			texture.bind();
			mesh.render(GL10.GL_TRIANGLES);
			gl.glPopMatrix();
			if(fbteRegion==null||Gdx.input.justTouched())
			{
				if(fbteRegion!=null) fbteRegion.getTexture().dispose();
				fbteRegion=ScreenUtils.getFrameBufferTexture();
			}
			batch.begin();
			if(fbteRegion!=null)
			{
				batch.draw(fbteRegion, 0, 0, 100, 100);
			}
			batch.end();
		}

		@Override
		public void resize(int arg0, int arg1)
		{
			
		}

		@Override
		public void resume()
		{
		}


		

	}
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		initialize(new MyGameListen(), false);
	}
	
}

因为我是libgdx的初学者，里面有些代码不能解释，所以就先不解释了，只是提供一个例子。

效果图如下：

估计91助手的屏幕截图有点问题，这正方体看起来有点弯曲，但实际就是一个四四方方的正方体，并在旋转。