Skin modifier crashes Blender #54342

New Issue

BlenderSpot · 2018-03-16T21:59:05+01:00

BlenderSpot commented

2018-03-16 21:59:05 +01:00

Windows 10

Blender 2.79a 8928d99270

Adding the skin modifier to the stack, after boolean modifier with Union and the BMesh solver, crashes blender. (if the solver is Carve, blender doesn't crash)

Have a cube, then have another cube. Unite these cubes with the boolean modifier (the operation has to be Union) the solver has to be BMesh then add the skin modifier to the stack; and then blender will crash.

Windows 10 Blender 2.79a 8928d99270f Adding the skin modifier to the stack, after boolean modifier with Union and the BMesh solver, crashes blender. (if the solver is Carve, blender doesn't crash) Have a cube, then have another cube. Unite these cubes with the boolean modifier (the operation has to be Union) the solver has to be BMesh then add the skin modifier to the stack; and then blender will crash.

BlenderSpot commented

2018-03-16 21:59:05 +01:00

Added subscriber: @unimbox

Ray molenkamp commented

2018-03-16 22:05:46 +01:00

Added subscribers: @ideasman42, @LazyDodo

Ray molenkamp commented

2018-03-16 22:05:46 +01:00

can confirm the issue on latest master.

cubes.blend

to make repro easier, open file, add skin modifier.

@ideasman42 do i need to add this to #47030 ?

can confirm the issue on latest master. [cubes.blend](https://archive.blender.org/developer/F2446879/cubes.blend) to make repro easier, open file, add skin modifier. @ideasman42 do i need to add this to #47030 ?

Rob Dodd commented

2018-03-24 13:54:40 +01:00

Added subscriber: @rob_dodd6

Rob Dodd commented

2018-03-24 13:54:40 +01:00

(Disclaimer: I'm completely new to Blender dev, and I randomly picked this bug to have a look at to try to figure out the code. I've think I've tracked it to a certain point, described below, but please use caution when trusting what I say...)

This seems to be caused by the boolean modifier creating a DerivedMesh with a vertData layer of type CD_MVERT_SKIN, but with the radius set to 0 (or actually just never filled in). I've so far failed to find out where that should actually get filled in.

This causes a whole bunch of NAN's to be spat out into the vertex data of the convex hulls of the Skin modifier.

Hope that's helpful! Apologies if it's wrong/obvious.

(Disclaimer: I'm completely new to Blender dev, and I randomly picked this bug to have a look at to try to figure out the code. I've *think* I've tracked it to a certain point, described below, but please use caution when trusting what I say...) This seems to be caused by the boolean modifier creating a DerivedMesh with a vertData layer of type CD_MVERT_SKIN, but with the radius set to 0 (or actually just never filled in). I've so far failed to find out where that should actually get filled in. This causes a whole bunch of NAN's to be spat out into the vertex data of the convex hulls of the Skin modifier. Hope that's helpful! Apologies if it's wrong/obvious.

Paweł Żukowski commented

2018-03-28 19:20:41 +02:00

Added subscriber: @idlecode

Germano Cavalcante commented

2020-01-20 19:45:03 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-01-20 19:45:03 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Germano Cavalcante closed this issue

2020-01-20 19:45:03 +01:00

Germano Cavalcante self-assigned this 2020-01-20 19:45:03 +01:00

Germano Cavalcante commented

2020-01-20 19:45:03 +01:00

I cannot reproduce this with either blender 2.79b or current development versions of Blender.

I believe the problem has already been solved.

I cannot reproduce this with either blender 2.79b or [current development versions ](https://builder.blender.org/download/) of Blender. I believe the problem has already been solved.

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Skin modifier crashes Blender #54342