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Surface Custom Texture Node
This node represents a 2D custom texture, that is assigned to an object's surface in the Texture field of the Custom Surface Texture group.
This texture gives you a wide range of opportunities for customization, and enables you to optimize the number of materials while extending visual diversity. For example, instead of tweaking a set of similar materials for different surfaces, you can assign a unique custom texture to each surface and use a single material with the final look depending on the custom texture.