libgdx 3D 从资源文件加载模型

1. 资源下载：https://github.com/xoppa/blog/tree/master/tutorials/assets/loadmodels/data

把资源文件放到android/assets/data下

别忘了将Run Config的working directory指向assets

2. 代码

 1 package com.mygdx.game;

 2 

 3 import com.badlogic.gdx.ApplicationAdapter;

 4 import com.badlogic.gdx.Gdx;

 5 import com.badlogic.gdx.assets.AssetManager;

 6 import com.badlogic.gdx.graphics.GL20;

 7 import com.badlogic.gdx.graphics.PerspectiveCamera;

 8 import com.badlogic.gdx.graphics.g3d.*;

 9 import com.badlogic.gdx.graphics.g3d.attributes.ColorAttribute;

10 import com.badlogic.gdx.graphics.g3d.environment.DirectionalLight;

11 import com.badlogic.gdx.graphics.g3d.utils.CameraInputController;

12 import com.badlogic.gdx.utils.Array;

13 

14 public class MyGdxGame2 extends ApplicationAdapter {

15     public Environment environment;//可以包含点光源集合和线光源集合

16     public PerspectiveCamera cam;//3D视角

17     public CameraInputController camController;//视角控制器

18 

19     public AssetManager assets;

20     public Array<ModelInstance> instances = new Array<ModelInstance>();

21     public ModelBatch modelBatch;

22 

23     public boolean loading;

24 

25     @Override

26     public void create () {

27         environment = new Environment();

28         environment.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.4f, 0.4f, 0.4f, 1f));//环境光

29         environment.add(new DirectionalLight().set(0.8f, 0.8f, 0.8f, -1f, -0.8f, -0.2f));//直线光源

30 

31         modelBatch = new ModelBatch();

32         cam = new PerspectiveCamera(67, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());//67可以理解成一个定值，视角宽度（67度）

33         cam.position.set(10f, 10f, 10f);

34         cam.lookAt(0,0,0);

35         cam.near = 1f;

36         cam.far = 300f;

37         cam.update();

38 

39         camController = new CameraInputController(cam);

40         Gdx.input.setInputProcessor(camController);

41 

42         assets = new AssetManager();

43         assets.load("data/ship.obj", Model.class); 44         loading = true;

45 

46     }

47 

48     private void doneLoading() {

49         Model ship = assets.get("data/ship.obj", Model.class);

50         ModelInstance shipInstance = new ModelInstance(ship);

51         instances.add(shipInstance);

52         loading = false;

53     }

54 

55     @Override

56     public void render () {

57         if (loading && assets.update()){

58             doneLoading();

59         }

60 

61         camController.update();

62         Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());

63         Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);

64 

65         modelBatch.begin(cam);

66         modelBatch.render(instances,environment);

67         modelBatch.end();

68     }

69 

70     @Override

71     public void dispose() {

72         modelBatch.dispose();

73         instances.clear();

74  assets.dispose(); 75         super.dispose();

76     }

77 }

3. 截图

 

4. 多个实例

 1 private void doneLoading() {

 2         Model ship = assets.get("data/ship.obj", Model.class);

 3         for (float x = -5f; x <= 5f; x += 2f) {

 4             for (float z = -5f; z <= 5f; z += 2f) {

 5                 ModelInstance shipInstance = new ModelInstance(ship);

 6                 shipInstance.transform.setToTranslation(x, 0, z);//设置位置

 7                 instances.add(shipInstance);

 8             }

 9         }

10         loading = false;

11     }

 

 5. obj文件对于目前测试用是没有问题的，但是实际应用中，模型要复杂得多，obj貌似支持不了。

libgdx支持两种文件格式，g3db(二进制)和g3dj(json)。

可以使用 fbx-conv工具进行格式转换，支持的格式FBX/Collada/Obj。FBX是大多数3d建模软件都支持的。

工具主页：https://github.com/libgdx/fbx-conv