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一个模型如何使用多个纹理?我有一个 obj 模型包含房子和草,我如何 setTexture 为这个 obj 模型使用房子纹理和草纹理?

TextureManager tm = TextureManager.getInstance();
Texture houseTexture = new Texture(LoadAssets.bitmap1);
Texture grassTexture = new Texture(LoadAssets.bitmap2);
tm.addTexture("houseTexture", houseTexture);
tm.addTexture("grassTexture",grassTexture);
house=Object3D.mergeAll(Loader.loadOBJ(LoadAssets.loadf("houseMultiMaterial.obj"),LoadAssets.loadf("houseMultiMaterial.mtl"),2));
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