bedrock-samples/resource_pack/particles/balloon_gas.json

{
  "format_version": "1.10.0",
  "particle_effect": {
    "description": {
      "identifier": "minecraft:balloon_gas_particle",
      "basic_render_parameters": {
        "material": "particles_blend",
        "texture": "textures/particle/particles"
      }
    },
    "components": {
      "minecraft:emitter_rate_instant": {
        "num_particles": 1
      },        
      "minecraft:emitter_lifetime_once": {
      },
      "minecraft:emitter_shape_point": {
        "direction": [ "variable.direction.x", "variable.direction.y", "variable.direction.z" ]
      },
      "minecraft:particle_initial_speed": 0.0,
      "minecraft:particle_lifetime_expression": {
        "max_lifetime": "Math.Random(0.75, 0.9)"
      },
      "minecraft:particle_motion_dynamic": {
        "linear_acceleration": [ 0.1, 0.1, 0.1 ],
        "linear_drag_coefficient": 0.49
      },
      "minecraft:particle_appearance_billboard": {
        "size": [ "(variable.particle_random_1 * 0.5f + 0.5f) * 0.2", "(variable.particle_random_1 * 0.5f + 0.5f) * 0.2" ],
        "facing_camera_mode": "lookat_xyz",
        "uv": {
          "texture_width": 128,
          "texture_height": 128,
          "flipbook": {
            "base_UV": [ 56, 88 ],
            "size_UV": [ 8, 8 ],
            "step_UV": [ -8, 0 ],
            "frames_per_second": 8,
            "max_frame": 8,
            "stretch_to_lifetime": true,
            "loop": false
          }
        }
      },
      "minecraft:particle_appearance_tinting": {
        "color": [ "variable.particle_age > (variable.particle_lifetime / 2.0) ? 1 - (0.0153 * (1 - Math.pow(0.7, variable.particle_age)) / (1 - 0.7)) : 1.0", "variable.particle_age > (variable.particle_lifetime / 2.0) ? 1 - (0.0387 * (1 - Math.pow(0.7, variable.particle_age)) / (1 - 0.7)) : 1.0", "variable.particle_age > (variable.particle_lifetime / 2.0) ? 1 - (0.0636 * (1 - Math.pow(0.7, variable.particle_age)) / (1 - 0.7)) : 1.0", "variable.particle_age > (variable.particle_lifetime / 2.0) ? 1 - 0.60 * ((variable.particle_age - (variable.particle_lifetime / 2.0)) / (variable.particle_lifetime / 2.0)) : 1.0" ]
      },
      "minecraft:particle_appearance_lighting": {}
    }
  }
}