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Limitation & Known Issues (CC v3.41)

Posted By Miranda (RL) 6 Months Ago
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Miranda (RL)
Miranda (RL)
Posted 6 Months Ago
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Last Active: 6 hours ago
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Hi Character Creator Users,

Character Creator and Omniverse Create are developed in progress, there are some limitations and known issues you shall know before start experiencing the solution of Character Creator and Omniverse Create. 

System Requirements

NVIDIA Omniverse™ is an open platform built for virtual collaboration and real-time photorealistic simulation, which requires higher specifications of GPU to run system smoothly. Please check full list of system requirements from the link below.
https://www.reallusion.com/character-creator/nvidia-omniverse/
*If an incompatible driver is detected the Omniverse RTX Renderer will not be enabled. 


Visual Differences
  • Light & IBL
  • Material & Texture

Visuals - Known Issues & Tips
  • SSS shader tends to create abnormal highlights and line segments.
  • Opacity map defects in Omniverse Create with certain hair content.
  • Mesh intersection among eye components (Tearline, Eye Occlusion, etc.) caused by the lack of suitable Omniverse shader.
  • Do not support export CC character USD from Unreal Engine to Omniverse Create due to lack of complex MDL support in Omniverse. Please always export character from Character Creator.  

Animation - Known Issues & Limitations
  • Morph/blend-shape animations (facial Animations can not be transferred due to lack of support morph/blend-shape animations.)
  • The character should be exported with the animation for the best possible result
  • Physics soft-cloth and collision shapes not exportable to Omniverse
  • Spring simulation not exportable to Omniverse
  • Physics rigid-bodies and constraints not exportable to Omniverse
  • Accessory animation not exportable to Omniverse

Edited
6 Months Ago by Miranda (RL)
Miranda (RL)
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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.

https://forum.reallusion.com/uploads/images/dab13113-60c9-4b1a-ae7b-6e5b.png

[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).
https://forum.reallusion.com/uploads/images/ee95eba2-44f9-4ec0-863e-8856.gif

In order to keep the lighting from the Dome Light without the accompanying background, one can disableDome Light > Visible Primary Ray.
https://forum.reallusion.com/uploads/images/953214fc-98f0-4872-b2fb-2e9b.gif

Miranda (RL)
Miranda (RL)
Posted 6 Months Ago
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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.
    https://forum.reallusion.com/uploads/images/c849766d-ad74-4825-a088-0f27.png

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.
    https://forum.reallusion.com/uploads/images/28f58a5e-0f54-4378-a337-3d8a.png

  • Case 2 - Glow Textures behave different between the two software.
    https://forum.reallusion.com/uploads/images/425fcc8a-21cb-40d4-9965-9110.jpg

Edited
6 Months Ago by Miranda (RL)
Miranda (RL)
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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.
https://forum.reallusion.com/uploads/images/7d0b453d-cee4-4256-88c0-9050.png

2. Appearance of line segments with the SSS shader, especially on the nose and jawline with the presence of an HDR enabled light dome.
https://forum.reallusion.com/uploads/images/2f577bab-dbb5-4142-9f05-d7af.png

Miranda (RL)
Miranda (RL)
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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
https://forum.reallusion.com/uploads/images/8d342fe7-9fe4-4e10-978b-f8a4.png

Tip: You can increase the transparency of the scalp by increasing the Opacity Threshold value.
https://forum.reallusion.com/uploads/images/17b8462b-d4f6-4193-ac7c-72d3.gif

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


You will get the following results when exporting Caleb in USD format via Material > Render Mode > RTX Path-Traced:
  • Picture left: the original look in CC.
  • Picture right: the rendered result of the exported USD in Omniverse.
    https://forum.reallusion.com/uploads/images/fe651645-1d76-4223-85b2-4be0.png
Tip: Disable the Enable Opacity Cutoff parameter.
https://forum.reallusion.com/uploads/images/dda664c9-69c1-4a1c-affe-0d57.gif

Watch the following video on how to disable the Enable Opacity Cutout option in Omniverse Create.


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.

Edited
6 Months Ago by Miranda (RL)
Miranda (RL)
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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.
https://forum.reallusion.com/uploads/images/9a3fdb14-8e0e-45aa-8526-4951.png

Edited
6 Months Ago by Miranda (RL)
Miranda (RL)
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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.
https://forum.reallusion.com/uploads/images/3ba0f278-b240-4372-84e3-4918.png
Miranda (RL)
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Animation - Known Issues & Limitations (2)

Physics soft-cloth and collision shapes not exportable to Omniverse 
  • Left side of the video: the physics soft-cloth simulation in iClone.
  • Right side of the video: lose of soft-cloth simulation when exported to Omniverse.


Edited
6 Months Ago by Miranda (RL)
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Animation - Known Issues & Limitations (3)

Spring Simulation not exportable to Omniverse 
  • Left side of the video: The spring simulation in iClone.
  • Right side of the video: Loss of spring effects when exported to Omniverse.

Edited
6 Months Ago by Miranda (RL)
Miranda (RL)
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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. 
  • Left side of the video: Physics rigid-body and constraint effects in iClone.
  • Right side of the video: Lose of physic rigid-body and constraint effect when exported to Omniverse.


Edited
6 Months Ago by Miranda (RL)



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