How to remove defaultLight from Omniverse Replicator?

Omniverse Synthetic Data Generation (SDG)
1

Hello,

I am new to Nvidia Omniverse, trying to generate synthetic data. I want to add my own sphere light, so I do not need the default LIGHT. How can I remove the default light entirely?

Screenshot from 2023-04-24 12-58-30
Screenshot from 2023-04-24 12-58-301922×1082 402 KB

These are the codes I used:

import omni.replicator.core as rep

with rep.new_layer():

    # Path for gears, work table, and the environment
    GEARS = 'omniverse://localhost/Projects/GearGenerator/Assets/Gears'
    TABLE = 'omniverse://localhost/Projects/GearGenerator/Assets/Surfaces/KIRoPro_Arbeitstisch.usd'
    ENVS = 'omniverse://localhost/NVIDIA/Assets/Scenes/Templates/Interior/ZetCG_ExhibitionHall.usd'
    
    # OmniPBR materials used for the gears. More info: https://docs.omniverse.nvidia.com/prod_materials-and-rendering/prod_materials-and-rendering/materials.html
    mats = rep.create.material_omnipbr(diffuse=rep.distribution.uniform((0,0,0), (1,1,1)),
                                       metallic=rep.distribution.choice([0, 0.5, 0.75, 1]),
                                       count=50
                                       )

    # Define camera
    camera = rep.create.camera(position=(0, 1300, 500), rotation=(-45, 0, 0))
    render_product = rep.create.render_product(camera, (1024, 1024))

    # Define randomizer function for gears
    def get_gears(size=3):
        instances = rep.randomizer.instantiate(rep.utils.get_usd_files(GEARS, recursive=True), size=size, mode='scene_instance')
        with instances:
            rep.modify.semantics([("class", "gear")])
            rep.modify.pose(
                position=rep.distribution.uniform((-200, 800, -200), (200, 900, 200)),
                rotation=rep.distribution.uniform((-180, -180, -180), (180, 180, 180)),
                scale=1.5
            )
            rep.randomizer.materials(mats)
        return instances.node
    
    # Adding and randomizing light source
    def sphere_lights():
        lights = rep.create.light(
            light_type="Sphere",
            color=rep.distribution.uniform((0, 0, 0), (255, 255, 255)),
            intensity=rep.distribution.uniform(1000, 35000),
            position=rep.distribution.uniform((-500, 800, -500), (500, 1600, 500)),
            scale=rep.distribution.uniform(50, 100)
        )
        return lights.node

    # Register randomization
    rep.randomizer.register(get_gears)
    rep.randomizer.register(sphere_lights)

    # Create environment and work table
    env = rep.create.from_usd(ENVS)
    surface = rep.create.from_usd(TABLE)
    with surface:
        rep.modify.pose(
            position = (0, 435, 0),
            rotation = (-90, 0, 0),
            scale = 1000
        )

    # Generate frames
    with rep.trigger.on_frame(num_frames=10):
        rep.randomizer.get_gears()
        rep.randomizer.sphere_lights()
 
    # Initialize and attach writer
    writer = rep.WriterRegistry.get("BasicWriter")
    writer.initialize(
        output_dir="~/Documents/GearProject/gearproject/datasets/rand_light",
        rgb=True,
        bounding_box_2d_tight=True
    )

    writer.attach([render_product])

    # Simulate in Omniverse Code
    rep.orchestrator.run()
2

Hello,

Here are two different ways to remove the default/ambient light

# Remove the default light
default_light = rep.get.prims(path_pattern="/Environment/defaultLight")
with default_light:
    rep.modify.visibility(False)

You can also use

rep.settings.carb_settings("/rtx/sceneDb/ambientLightIntensity", 0.0)
rep.settings.carb_settings("/rtx/sceneDb/ambientLightColor", (0.0, 0.0, 0.0))