When using SceneSerializer.Serialize to serialize the current scene,the OpenPBRMaterial was not serialized properly,so many properties were not serialized,it‘s that in case or just forgot 
We are still in the process of building the material. We will do an overall pass at the end to be sure we are not missing serialization data
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I am particularly looking forward to the official launch of this material, as its performance looks better than ordinary PBRM material. I wish you a smooth development progress 