Different programs use different methods to produce their shaders and you may need to make some adjustments when opening files from other programs in Carrara. The best thing to do to avoid this is to make sure you save all of your files that you intend to open in another program with Texture maps as textures or convert all of your procedural textures to texture maps. This will save you a lot of time and require minimal adjustments when opening your files in other programs.
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