bedrock-samples/resource_pack/render_controllers/happy_ghast.render_controllers.json

{
  "format_version": "1.10.0",
  "render_controllers": {
    "controller.render.happy_ghast": {
      "geometry": "Geometry.default",
      "materials": [ { "*": "Material.default" } ],
      "textures": [ "query.is_baby ? Texture.ghastling : Texture.happy_ghast" ]
    },
    "controller.render.happy_ghast_ropes": {
      "geometry": "Geometry.ropes",
      "materials": [ { "*": "Material.default" } ],
      "textures": [ "Texture.ropes" ],
      "part_visibility": [
        { "*": "variable.render_ropes" }
      ]
    }
  }
}