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MDLMaterial 具有属性“scatteringFunction”(MDLScatteringFunction)，它只有子类 MDLPhysicallyPlausibleScatteringFunction，并且这些类相应地仅描述 Lambertian/Blinn-Phong 或 PBR。如果 submesh 材质具有 Oren-Nayar 模型或自定义片段功能怎么办？如何确定将哪个着色模型应用于子网格？