Trimmed curve with subsurf crashes Blender #79207

New Issue

Serge Lyatin · 2020-07-23T23:13:20+02:00

Serge Lyatin commented

2020-07-23 23:13:20 +02:00

System Information
Operating system: win10

Blender Version
Broken: (2.90.2 Alpha, 2.79b)

Short description of error
Curve has 2 beveled splines, one is zero length (see it in edit mode), end is trimmed at 0.99 value with "spline" mode (see curve's data tab).
Enabling subsurf modifier in viewport crashes Blender. Other trimming modes works w/o issue.

Exact steps for others to reproduce the error

In an empty scene, add the biezer curve
Go to Edit mode
Duplicate and move the spline ({key Shift D})
Set handle type of the new spline to free ({key V})
Scale this new spline to zero ({key S 0})
Exit edit mode
In Object Data Properties -> Geometry -> Bevel set:
Depth: 1.0
Bevel End: 0.99
Bevel Mapping Start: Spline
Bevel Mapping End: Spline
Add the subsurf modifier -> crash
or:
Open attached file
enable subsurf modifier in viewport -> crash

Curve_subsurf.blend

**System Information** Operating system: win10 **Blender Version** Broken: (2.90.2 Alpha, 2.79b) **Short description of error** Curve has 2 beveled splines, one is zero length (see it in edit mode), end is trimmed at 0.99 value with "spline" mode (see curve's data tab). Enabling subsurf modifier in viewport crashes Blender. Other trimming modes works w/o issue. **Exact steps for others to reproduce the error** - In an empty scene, add the biezer curve - Go to Edit mode - Duplicate and move the spline ({key Shift D}) - Set handle type of the new spline to `free` ({key V}) - Scale this new spline to zero ({key S 0}) - Exit edit mode - In `Object Data Properties` -> `Geometry` -> `Bevel` set: - `Depth`: 1.0 - `Bevel End`: 0.99 - `Bevel Mapping Start`: Spline - `Bevel Mapping End`: Spline - Add the subsurf modifier -> crash or: - Open attached file - enable subsurf modifier in viewport -> crash [Curve_subsurf.blend](https://archive.blender.org/developer/F8716817/Curve_subsurf.blend)

Serge Lyatin commented

2020-07-23 23:13:20 +02:00

Added subscriber: @SergeL

Germano Cavalcante commented

2020-07-24 21:44:11 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-07-24 21:44:11 +02:00

I can confirm. But I can't say if the problem is a corrupted data.
It would be interesting if you described the steps to achieve that curve.

I can confirm. But I can't say if the problem is a corrupted data. It would be interesting if you described the steps to achieve that curve.

Serge Lyatin commented

2020-07-24 21:57:19 +02:00

It's a result from Animation Nodes, I've fixed zero-length splines (is it considered as corrupted data?) inside it and everything is ok. But still thinking Blender should not crash that hard.