Visual Differences: Light & IBL

Light 

• Rudimentary light settings such as rotations, translations, multiplier, and light textures can be brought into Omniverse Create.
• Discrepancies in the light intensity can happen as a result of translating the Multiplier value.

IBL 

• The IBL map will carry over to Omniverse, basic matching will be applied to the IBL dome's rotation and image strength.
• Mismatch between the IBL dome position and brightness can still occur.

As mentioned before, parameters value are transferred, however, visual discrepancies still exist.
For example, applying embedded lights and IBL in Character Creator and performing Omniverse Create > Render Mode: Path-Traced (picture right) gives a different visual result.



[Tips]
Users will need manually enable Dome Light after exporting USD format to Omniverse, with included lights and IBL (Omniverse Create > Path-Traced Render Mode).


In order to keep the lighting from the Dome Light without the accompanying background, one can disableDome Light > Visible Primary Ray.

Visual Differences: Material & Texture 

1. Displacement map and Blend map do not carry from Character Creator to Omniverse. 

• Left picture: A Blend map is applied to the armor.
• Right picture: Once the CC character is sent to Omniverse, the Blend map disappears.
  

2. Material settings, with the exception of Opacity Strength parameter, do not carry from Character Creator to Omniverse.

• Case 1 - Diffuse Color value, Texture Strength does not carry into Omniverse.
  
  
  
• Case 2 - Glow Textures behave different between the two software.
  
  

Visuals - Known Issues & Tips (1) 

SSS shader tends to create abnormal highlights and line segments

CC Omniverse Connector was developed for Omniverse Create 2021.1. There are some known issues with this version that will be subsequently addressed and resolved with the release of Omniverse Create 2021.2:

1. Appearance of excessively bright highlights with the SSS shader, e.g. oily lips.


2. Appearance of line segments with the SSS shader, especially on the nose and jawline with the presence of an HDR enabled light dome.

Visuals - Known Issues & Tips (2) 

Opacity map defects in Omniverse Create with certain hair content

You will get the following results when exporting Caleb in USD format viaMaterial > Render Mode > RTX Real-Time:

• Picture left: the original look in Character Creator.
• Picture right: the rendered result of the exported USD in Omniverse

Tip: You can increase the transparency of the scalp by increasing the Opacity Threshold value.


Watch the following video on how to adjust the Opacity Threshold value:


Note: Setting the default Enable Opacity Cutout value to OFF for the PBR hair shader as a work-around will reduce hair density by 90% in Omniverse Create. Therefore, it's recommended to counter each defect by manually adjusting the Cutout value.

Visuals - Known Issues & Tips (3) 

Mesh intersection among eye components (Tearline, Eye Occlusion, etc.) caused by the lack of suitable Omniverse shader

• Bottom left picture: A character in Character Creator.
• Bottom right picture: The same character brought over to Omniverse Create.

If you look carefully, you'll notice that parts of the Eye Occlusion mesh has intersected into the eyeball geometry.

Animation - Known Issues & Limitations (1)

The character should be exported with the animation for the best possible result 

For example, animation applied from a standard proportion to a smaller character will give unexpected/erroneous results.

By exporting the character with the accompanying motion, the correct results can be had:


When a smaller character like "Slacker" is given a motion that was created for a standard sized character like "Caleb", we get the following abnormalities:


Cross-generational application of motion files will cause the eyes and teeth to offset.
A CC3 Plus motion is applied to a CC3 Plus character (on the left) and a CC3 cartoon character (on the right). Notice the teeth and eyes of the cartoon character have all displaced from their original positions.

Animation - Known Issues & Limitations (2)

Physics soft-cloth and collision shapes not exportable to Omniverse 

Animation - Known Issues & Limitations (3)

Spring Simulation not exportable to Omniverse 

Animation - Known Issues & Limitations (4)

Physics rigid-bodies and constraints not exportable to Omniverse

Example: earring props from the G6 HAIR & ACCESSORY - HOTTEST HAIRSTYLES content pack.