"T-spline surface is not extractable"

[jona.nolakers]

Hello!

I´m stuck again with error messages I don´t understand. I was adding a seam on a car model, and the error message "T-spline surface is not extractable" appeared. Never seen it before, and can´t find what it means anywhere. 

Error is likely to be somewhere aroun the ducktail.

There are also some bad surfaces around the taillight and side skirts that i´d like to fix, but can´t figure out.

Kind regards

Jona

[TrippyLighting]

My usual response:

1. Avoid triangles at all costs.

2. Avoid N-gons with mor than 5 vertices!

3. N-gons with 5 vertices are Ok if used (very) sparingly.

The error messages unfortunately are not very useful in tracking down the problem, so trying to stick to tried and proven modeling techniques - stich to all-quad geometry for complex models - is your best bet for a successful T-Spline model.

@adam.helps do you have any internal tools that can help quickly the specific problem area ? 

[jona.nolakers]

Its good advice, but might be difficult for me as a beginner to figure out how to solve everything. I´ll try my best.

Still no progress after removing all 6 sided n-gons

[jona.nolakers]

Removed all triangles in the area where I believe the issue is, and tried to minimize 5 sided n-gons. Still same error code.

according to this: https://forums.autodesk.com/t5/fusion-360-support/i-m-stuck-on-t-spline-surface-is-not-extractable/m...

there could be problems with T-points being too close to star points. I checked this around where I believe the problem is, and found a spot at the corner of the ducktail. This fixed the "T-spline surface is not extractable", but caused a "Floating pint overflow" not fixable by just doing a repair body.

I will continue working to try to fix my new issue.

[TrippyLighting]

I did a bit more cleanup work by eliminate more triangles and removing some edge loops to reduce n-gons. It converts now but still is likely prone to fail unless things are cleaned up.

This is quite an advanced model and if this is amongst your first models, my hat is off to you.