Randomizer based Replicator code gets slower every frame

Omniverse Synthetic Data Generation (SDG)
15

Thank you for providing help on this topic. The issue where the rendering slows down is currently not a problem for me because I do not have to render that many images at once. However I am curious if this bug is related to the problem I mentioned in here:

Maybe there is a better way of achieving the following:

  1. Instantiate a bunch of Parts (Given by USD-Path)
  2. Modify the semantics of the parts (1 semantic class for each USD-Path)
  3. Randomize the rotation around the z-axis of the part
  4. Scatter it over a plane

Currently my implementation looks like this:

# region Randomizer methods
# Randomize Part Position and Rotatation
def random_Parts():
    # Retrieve the prims of the instances
    instances = rep.get.prims(
        semantics=[('class', 'cube'), ('class', 'capsule'), ('class', 'cone'), ('class', 'cylinder'), ('class', 'sphere'), ('class', 'torus')]
    )

    with instances:
        # Randomize the rotation of the parts
        rep.randomizer.rotation(
            min_angle=(0, 0, -180),
            max_angle=(1, 1, 180)
        )

        # Scatter it across the plane
        rep.randomizer.scatter_2d(
            surface_prims=spawnplane,
            check_for_collisions=True,
        )
    return instances.node

# Instantiate a random number of parts
def instantiate_Parts(file_path, classes, sample_size):
    # Instantiates a number of parts (size specifies the number of instances per part)
    # The distribution of the instances over all is random
    instances = rep.randomizer.instantiate(
        paths=file_path,
        size=sample_size,
        mode='reference'
    )

    with instances:
        # Label each part
        rep.modify.semantics([('class', classes)])

        # Randomize the parts material
        rep.randomizer.materials(
            materials=rep.get.material(path_pattern="/Looks/Parts/*")
        )

# Randomize the floor material
def random_Floor_Material():
    floor_material = rep.randomizer.materials(
        materials=rep.get.material(path_pattern="/Looks/Floor/*"),
        input_prims=floor
    )
    return floor_material.node

# Randomize Dome Light
def dome_Light():
    lights = rep.create.light(
        light_type="Dome",
        position=(0, 0, 0),
        rotation=rep.distribution.uniform((0, 0, -180), (0, 0, 180)),
        scale=(1, 1, 1),
        name='HDRI',
        texture=rep.distribution.choice([
            'https://omniverse-content-production.s3.us-west-2.amazonaws.com/Assets/Skies/2022_1/Skies/Indoor/autoshop_01.hdr',
            'https://omniverse-content-production.s3.us-west-2.amazonaws.com/Assets/Skies/2022_1/Skies/Indoor/small_hangar_01.hdr',
            'http://omniverse-content-production.s3-us-west-2.amazonaws.com/Assets/Skies/Indoor/ZetoCGcom_ExhibitionHall_Interior1.hdr',
            'https://omniverse-content-production.s3.us-west-2.amazonaws.com/Assets/Skies/2022_1/Skies/Indoor/adams_place_bridge.hdr'
            ])
        )
    return lights.node

# Randomize the Focus Distance of the camera
def random_Focus_Distance(camera, MinFocusDistance, MaxFocusDistance):
    with camera:
        rep.modify.attribute(
            name='focusDistance',
            value=rep.distribution.uniform(MinFocusDistance, MaxFocusDistance)
        )
    return camera.node

# Register Randomizers
rep.randomizer.register(random_Parts)
rep.randomizer.register(instantiate_Parts)
rep.randomizer.register(random_Floor_Material)
rep.randomizer.register(dome_Light)
rep.randomizer.register(random_Focus_Distance)
# endregion

  # Instatiate all the parts
  for classes, path in PARTS.items():
      rep.randomizer.instantiate_Parts(path, classes, 3)
  
  # Trigger the randomizer at each frame
  with rep.trigger.on_frame(num_frames=num):
      rep.randomizer.random_Parts()
      rep.randomizer.random_Floor_Material()
      rep.randomizer.dome_Light()
      rep.randomizer.random_Focus_Distance(topview, 1200, 1600)

Thank you for your efforts!
Julian