RPTweaks solves the problem of vanilla item models being static: it extends item model definitions with templates, variables, custom flags, regex and mathematical expressions, so one model can change based on item data — custom name, components, player state or game time — without custom model data. It integrates with RPF’s model pipeline, evaluating those conditions both during model resolution and rendering so the correct model, texture and transforms are selected dynamically.
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The license allows you to freely use this mod in any public builds, but I would be very happy if you told as many people as possible about the mod, because it is very useful, not many people know about it, and I worked very hard on it.