Ant.yaml

# used to create the object
name: Ant

physics_engine: ${..physics_engine}

# if given, will override the device setting in gym.
env:
  numEnvs: ${resolve_default:4096,${...num_envs}}
  envSpacing: 5
  episodeLength: 1000
  enableDebugVis: False

  clipActions: 1.0

  powerScale: 1.0
  controlFrequencyInv: 1 # 60 Hz

  # reward parameters
  headingWeight: 0.5
  upWeight: 0.1

  # cost parameters
  actionsCost: 0.005
  energyCost: 0.05
  dofVelocityScale: 0.2
  contactForceScale: 0.1
  jointsAtLimitCost: 0.1
  deathCost: -2.0
  terminationHeight: 0.31

  plane:
    staticFriction: 1.0
    dynamicFriction: 1.0
    restitution: 0.0

  asset:
    assetFileName: "mjcf/nv_ant.xml"

  # set to True if you use camera sensors in the environment
  enableCameraSensors: False

sim:
  dt: 0.0166 # 1/60 s
  substeps: 2
  up_axis: "z"
  use_gpu_pipeline: ${eq:${...pipeline},"gpu"}
  gravity: [0.0, 0.0, -9.81]
  physx:
    num_threads: ${....num_threads}
    solver_type: ${....solver_type}
    use_gpu: ${contains:"cuda",${....sim_device}} # set to False to run on CPU
    num_position_iterations: 4
    num_velocity_iterations: 0
    contact_offset: 0.02
    rest_offset: 0.0
    bounce_threshold_velocity: 0.2
    max_depenetration_velocity: 10.0
    default_buffer_size_multiplier: 5.0
    max_gpu_contact_pairs: 8388608 # 8*1024*1024
    num_subscenes: ${....num_subscenes}
    contact_collection: 0 # 0: CC_NEVER (don't collect contact info), 1: CC_LAST_SUBSTEP (collect only contacts on last substep), 2: CC_ALL_SUBSTEPS (broken - do not use!)

task:
  randomize: False
  randomization_params:
    # specify which attributes to randomize for each actor type and property
    frequency: 600   # Define how many environment steps between generating new randomizations
    observations:
      range: [0, .002] # range for the white noise
      operation: "additive"
      distribution: "gaussian"
    actions:
      range: [0., .02]
      operation: "additive"
      distribution: "gaussian"
    actor_params:
      ant:
        color: True
        rigid_body_properties:
          mass: 
            range: [0.5, 1.5]
            operation: "scaling"
            distribution: "uniform"
            setup_only: True # Property will only be randomized once before simulation is started. See Domain Randomization Documentation for more info.
        dof_properties:
          damping: 
            range: [0.5, 1.5]
            operation: "scaling"
            distribution: "uniform"
          stiffness: 
            range: [0.5, 1.5]
            operation: "scaling"
            distribution: "uniform"
          lower:
            range: [0, 0.01]
            operation: "additive"
            distribution: "gaussian"
          upper:
            range: [0, 0.01]
            operation: "additive"
            distribution: "gaussian"