Bug:FBX failed during ImportScene

[Jake Slack]

Describe the bug
Loading this specific FBX will fail to import the scene: https://drive.google.com/file/d/17FOvYxWD113xmOTk-te6s3Ad0nQoyLp5/view?usp=sharing

To Reproduce
Steps to reproduce the behavior:

1. Download test FBX
2. Import using assimp
3. Will freeze importing scene

Expected behavior
The assimp scene import function should complete successfully

Platform (please complete the following information):

• OS: Windows 10, 64-bit
• Unity Trilib plugin

**Notes

• It seems the model doesn't load fully in Blender but does in Windows 3DViewer
• Faily big model at 5million polys (takes about 45 seconds to load in 3DViewer on my machine)
  

[Jake Slack]

Update:
It seems that the aiImportFileEx call does complete after around 25minutes for me.
Opening the same model in CloudCompare takes around 10secs...

[Kim Kulling]

The time is spended in calculating the tanget space. There is a search used to fine the nearest neighbours. And this search seems to be using a quadratic algorithm.
As a workaround you can disable the calculation of the tangents.

And we need to optimize / replace the algorithm.

[Jake Slack]

Hi Kim, Thanks for the update there. I will try to disable the tangent calculation and let you know if that has an effect. Thanks! Jake [image: created with MySignature.io] <https://mysig.io/Y2I0ODI> Jake Slack | Founder site: www.slackerapps.co.jp email: ***@***.*** address: Tokyo, Shibuya-Ku, Sasazuka

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On Wed, Jun 12, 2024 at 8:36 PM Kim Kulling ***@***.***> wrote: The time is spended in calculating the tanget space. There is a search used to fine the nearest neighbours. And this search seems to be using a quadratic algorithm. As a workaround you can disable the calculation of the tangents. And we need to optimize / replace the algorithm. — Reply to this email directly, view it on GitHub <#5544 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE42HHJBJCBBWHWVMFYT5GLZHAXEXAVCNFSM6AAAAABGIT735WVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNRSG44DONBRHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>