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

package com.mygdx.game;

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.assets.AssetManager;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.PerspectiveCamera;
import com.badlogic.gdx.graphics.g3d.*;
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.utils.Array;

public class MyGdxGame2 extends ApplicationAdapter {
    public Environment environment;//可以包含点光源集合和线光源集合
    public PerspectiveCamera cam;//3D视角
    public CameraInputController camController;//视角控制器

    public AssetManager assets;
    public Array<ModelInstance> instances = new Array<ModelInstance>();
    public ModelBatch modelBatch;

    public boolean loading;

    @Override
    public void create () {
        environment = new Environment();
        environment.set(new ColorAttribute(ColorAttribute.AmbientLight, 0.4f, 0.4f, 0.4f, 1f));//环境光
        environment.add(new DirectionalLight().set(0.8f, 0.8f, 0.8f, -1f, -0.8f, -0.2f));//直线光源

        modelBatch = new ModelBatch();
        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）
        cam.position.set(10f, 10f, 10f);
        cam.lookAt(0,0,0);
        cam.near = 1f;
        cam.far = 300f;
        cam.update();

        camController = new CameraInputController(cam);
        Gdx.input.setInputProcessor(camController);

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

    }

    private void doneLoading() {
        Model ship = assets.get("data/ship.obj", Model.class);
        ModelInstance shipInstance = new ModelInstance(ship);
        instances.add(shipInstance);
        loading = false;
    }

    @Override
    public void render () {
        if (loading && assets.update()){
58             doneLoading();
59         }

        camController.update();
        Gdx.gl.glViewport(0, 0, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT | GL20.GL_DEPTH_BUFFER_BIT);

        modelBatch.begin(cam);
        modelBatch.render(instances,environment);
        modelBatch.end();
    }

    @Override
    public void dispose() {
        modelBatch.dispose();
        instances.clear();
        assets.dispose();
        super.dispose();
    }
}

3. 截图

4. 多个实例

private void doneLoading() {
        Model ship = assets.get("data/ship.obj", Model.class);
        for (float x = -5f; x <= 5f; x += 2f) {
            for (float z = -5f; z <= 5f; z += 2f) {
                ModelInstance shipInstance = new ModelInstance(ship);
                shipInstance.transform.setToTranslation(x, 0, z);//设置位置
                instances.add(shipInstance);
            }
        }
        loading = false;
    }

 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