Generating Blockstates and Models Without JSON Files

Emitting Models from Code

ARRP can produce blockstate and model JSON at runtime, so you never hand-write model files. You build the model definition in code and let ARRP serialize it into the generated pack.

1. Decide the model type: a simple cube-all model, a cube with per-face textures, or a parent model that inherits from a vanilla template.

2. In your generator, create the model using ARRP's model builder — set the parent (for example a vanilla cube template) and assign textures by slot name (all, side, top, etc.).

3. Write the model to the models/block or models/item path using an identifier that matches your block or item.

4. Build the blockstate separately: map each block state (or the default variant) to the model identifier you just created.

5. Output both into the pack.

Keeping Textures Valid

ARRP generates JSON, not images — your textures must already exist as real files in your mod's assets or in a resource pack. Reference them by their normal texture identifier. If a texture is missing, the model will render with the missing-texture placeholder.

Reload and Check

Run a resource reload and place the block or hold the item. If it shows the purple/black missing model, verify the blockstate's model id exactly matches the model file path you wrote, and that the parent template exists.