Bug:FBX failed during ImportScene

[slacker-jake]

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)
  

[slacker-jake]

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

[kimkulling]

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.