• iClone and Omniverse are different renderers and interpret lights and shadows differently, as shown in the following tables:
  
  
  Besides the above table, a more detailed comparison table is provided below:
  
  * Click HBAO+ and Omniverse RT AO to get more information.
  
  
• Omniverse Render Overview:
• Omniverse Create Rendering Overview
• The Omniverse RTX Renderer (RTX Renderer introduction starts at the 8:56 minute mark)

• Case 1 - Interior setting: Omniverse point lights always create shadows and can be occluded.
  
• Case 2 - Interior setting: Omniverse IBL always create shadows and can be occluded.
• Case 3 - Embedded loft scene: Adjustment tips for Omniverse real-time mode.
• Case 4 - Interior setting: Using render settings to adjust scene brightness.
• Case 5 - Embedded SSS demo project: different rectangular lights.

The following images are the simple tests performed in the aforementioned comparison table. Omniverse point lights will always create shadows, therefore they can be occluded by the objects in the scene.
iClone point lights do not create shadows, therefore they can't be occluded, You can verify the light occlusion by inspecting the ground plane beneath the ball.



Embedded Project - Loft Scene rendered in iClone. The lighting in the scene is moderately bright.


Influence from the blue point light disappears when rendering the same iClone scene in Omniverse.


Since the blue point light is positioned under the floor, the light is occluded in Omniverse because it can cast shadows. The same blue point light in iClone works just fine because it does not cast shadows, and therefore, can not be occluded by geometry. When the point light is moved above the floorboard in Omniverse, it regains the ability to light the scene.

Take a look at iClone and Omniverse light positions in the following video:


Point light above and under the floorboard in Omniverse, before and after:

The following images are the simple tests performed in the aforementioned comparison table. Omniverse IBL will always emit lighting based on the image used, which can be occluded by the objects in the scene.
You can verify the light occlusion by inspecting the ground plane beneath the ball.


Embedded Project - Loft Scene rendered in iClone. The lighting in the scene is moderately bright.


When the entire scene is exported and rendered with Omniverse in Path-Traced mode, the final image turns out very dark.


If you take a look at the scene configuration, you'll notice that the scene is encased within four walls a ceiling, and a floor which results in a complete occlusion of the IBL contribution in Omniverse.


Tips: Turn off Cast Shadows for the wall mesh for the IBL to illuminate the room. Of course, you can also create a new light in Omniverse or use the Render Settings > Exposure adjustments mentioned in Case 4.


Toggling the wall cast shadow in Omniverse RTX Path-Traced mode, before and after:

Let's take a look at the same scene from Case 2 using iClone and OV real-time mode.

Rendered from iClone:


The following image rendered in Omniverse RTX Realtime mode is closer in brightness to the iClone render (above), when compared to Path-Traced mode, however, since the IBL is occluded by the walls, the lighting is slightly darker compared to iClone.


Besides the light coming from IBL, iClone also provides Ambient Light Color and real-time Global Illumination which can increase brightness for the entire scene.




Omniverse RTX Realtime mode also has ambient lighting and global illumination, therefore it can render brighter scenes compared to RTX Path-Traced mode which is missing these two options.
iClone can send both of these settings to Omniverse for more consistent lighting between the two software.

Ambient Light Color to Omniverse (RTX Realtime Mode)
Global illumination to Omniverse (RTX Realtime Mode


The following video shows you how to adjust the Ambient Light Color and Indirect Diffuse GI attributes in Omniverse under RTX Realtime mode:

If the scene imported into Omniverse is too dark or too bright, then one can adjust the exposure settings.
Fixed setting means that exposure does not automatically adjust to compensate for camera distance. This setting resides in Post Processing > Tone Mapping > CM2Factor. Greater values equate to increased brightness.


Exposure auto-compensation according to the camera's distance is the other method. It is accessible via Post Processing > Auto Exposure > White Point Scale. Greater values equate to decreased brightness.


Using a simple scene to observe Auto Exposure based on the camera's distance to the object ahead.


You can find out more about the render settings in the Omniverse Online Manual.