bedrock-samples/resource_pack/entity/magma_cube.entity.json

{
  "format_version": "1.8.0",
  "minecraft:client_entity": {
    "description": {
      "identifier": "minecraft:magma_cube",
      "materials": {
        "default": "magma_cube"
      },
      "textures": {
        "default": "textures/entity/slime/magmacube"
      },
      "geometry": {
        "default": "geometry.lavaslime"
      },
      "scripts": {
        "pre_animation": [
          "variable.slime_squish_factor = (query.previous_squish_value + (query.current_squish_value - query.previous_squish_value) * query.frame_alpha);",
          "variable.bounce = 1 / ((variable.slime_squish_factor / (query.variant * 0.5 + 1)) + 1);",
          "variable.horizontal_scale_amount = variable.bounce * query.variant;",
          "variable.vertical_scale_amount = (1 / variable.bounce) * query.variant;"
        ],
        "scaleX": "variable.horizontal_scale_amount",
        "scaleY": "variable.vertical_scale_amount",
        "scaleZ": "variable.horizontal_scale_amount"
      },
      "animations": {
        "move": "animation.magma_cube.move"
      },
      "animation_controllers": [
        {
          "general": "controller.animation.magma_cube.general"
        }
      ],
      "render_controllers": [
        "controller.render.magma_cube"
      ],
      "spawn_egg": {
        "texture": "spawn_egg",
        "texture_index": 20
      }
    }
  }
}