{
  "format_version": "1.10.0",
  "particle_effect": {
    "description": {
      "identifier": "minecraft:creaking_crumble_head",
      "basic_render_parameters": {
        "material": "particles_alpha",
        "texture": "textures/blocks/creaking_heart_side_active"
      }
    },
    "components": {
      "minecraft:emitter_rate_instant": {
        "num_particles": 20
      },
      "minecraft:emitter_lifetime_once": {
      },
      "minecraft:emitter_shape_box": {
        "half_dimensions": [ 0.45, 1.35, 0.45 ],
        "direction": [ "Math.random(-1.0, 1.0)", 1.0, "Math.random(-1.0, 1.0)" ]
      },
      "minecraft:particle_initial_speed": "Math.random(0.0, 1.0)",
      "minecraft:particle_lifetime_expression": {
        "max_lifetime": "0.2f / (Math.random(0.0, 1.0) * 0.9f + 0.1f)"
      },
      "minecraft:particle_motion_dynamic": {
        "linear_acceleration": [ 0, -9.8, 0 ],
        "linear_drag_coefficient": 0.5
      },
      "minecraft:particle_motion_collision": {
        "coefficient_of_restitution": 0.1,
        "collision_drag": 5,
        "collision_radius": 0.1
      },
      "minecraft:particle_appearance_billboard": {
        "size": [ "variable.particle_random_1 * 0.0375 + 0.0375", "variable.particle_random_2 * 0.0375 + 0.0375" ],
        "facing_camera_mode": "lookat_xyz",
        "uv": {
          "texture_width": 16,
          "texture_height": 16,
          "uv": [ "Math.round(variable.particle_random_1 * 12.0)", "Math.round(variable.particle_random_2 * 12.0)" ],
          "uv_size": [ 4, 4 ]
        }
      },
      "minecraft:particle_appearance_lighting": {}
    }
  }
}