Two-sided geometry cannot be enabled for re-imported models when converting from previous versions

When converting files from previous versions of Twinmotion to Twinmotion 2025.1, re-importing any existing imported geometry will cause the geometry to be re-imported with two-sided geometry disabled. There is no way to adjust this, causing some geometry to appear broken on re-import.

The workaround is to delete the existing import and start a new import, or manually adjust materials to be two-sided. This can present workflow problems for backwards compatible projects.

1. Create a file in Twinmotion 2024.1.2 or older and import geometry, such as an SKP file.
2. Open the file in Twinmotion 2025.1
3. Re-import the imported model

Result: The imported model will be re-imported with two-sided geometry disabled. There is no way to change this behavior.

Error code R-1618

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