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* What is the issue ?
After applied LSCM UV unwrapping to a polygon mesh shape that contains "Face Group" materials, and save it to a scene file, the file will then be saved with a corrupted data. Open this file will show incorrect shading in viewport windows.
* When does it occur ?
With any scene with "Face Group" materials assigned to a polygon mesh and then when "Mark Seams" technique is used to unwrap the UV by using the LSCM method. When saving this data with "Face Group" materials together, the scene file will be corrupted.
* With what versions does it happen ?
- Shade 3D ver.15.1 Standard and Professional
- Shade 3D ver.15.1.1 Standard and Professional
* What is the solution ?
1. Before saving to scene file
After applying LSCM's UV unwrapping, go to "Selection" menu > "Selected Edges" > "Unmark Seams" option and remove the seams data. The file will be saved correctly.
2. After saving to scene file
- Saved under ver.14 / 15.0.0 / 15.0.1 versions:
Open the corrupted file in ver.14 / 15.0.0 / 15.0.1 version and go to "Selection" menu > "Selected Edges" > "Unmark Seams" option and remove the seams data.
- Saved under ver.15.1 / 15.1.1 versions:
In this case, "Face Group" data has to be removed from the scene file first.
Open the corrupted file in the 15.1 / 15.1.1 versions, go to "Aggregate : Object Info" window and remove all the "Face Group" information.
Then reset the "Face Group" data again and repeat the above "Before save to scene file" method and save the file.