sorry, i had found that this way alse had some problems.
engine default material has a special flag named bUsedAsSpecialEngineMaterial,
ctrl cv copy a special material will be not effective.
so when i changed default grid material to copy, scene become bad.
i finally found that bUsedAsSpecialEngineMaterial material will use skeleton shaders which lead the error of my project, so i changed the engine code to remove skeleton shaders in default grid material.
finnally, i succeeded , and removed errors.
wish helpful.
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