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Exporting curves to Alembic crashes other software when reading
Open, Needs Information from UserPublic

Description

System Information
windows 8 64bit

Blender Version
Broken: 2.77.3 1fe9d67
Worked: (optional)

The curve import to others software will be report error, even cause crash

Exact steps for others to reproduce the error
Download the test file and import to maya, or houdini, the some curve type will make report error or cause crash.

blender to blender:

Nurbs into Maya:

Poly or Bezier into Maya:

Have test with maya 16, maya 17 and houdini 15

Details

Type
Bug

Event Timeline

Kévin Dietrich (kevindietrich) triaged this task as Confirmed, Low priority.

Setting to low priority since this will be a bit hard to solve without knowing how different software expect this data to be written. Alembic uses the Renderman conventions, and I already know that curves and NURBS are not as straightforward to export as meshes because of that (NURBS import is disable in Blender for this very reason). From the Maya plugin, control points need to be duplicated, but how this is determined is not documented, therefore I am afraid that a lot of trial and error needs to happen.

Kévin Dietrich (kevindietrich) raised the priority of this task from Confirmed, Low to Confirmed, Medium.Aug 30 2016, 11:30 AM
Kévin Dietrich (kevindietrich) lowered the priority of this task from Confirmed, Medium to Confirmed, Low.Sep 5 2016, 3:51 AM
Sybren A. Stüvel (sybren) raised the priority of this task from Confirmed, Low to Needs Information from User.

I see crashing of other applications as a problem with those applications, and not something Blender can fix.

@Leroy (Leroy) Do you have a clear specification of how NURBS curves and surfaces should be written, in order to be compatible with other software? And since this report is rather old already, can you test what happens with a current version of Blender and whether this is still an issue?

Sybren A. Stüvel (sybren) renamed this task from The curve problem in Alembic to Exporting curves to Alembic crashes other software when reading.Thu, Aug 22, 4:54 PM