Crash on export 3ds Max 2018.4 tested on Max2Babylon 1.0.5

[Gil-1]

Hello,

The following scene is causing a crash everytime we export it. The "Retina" mesh is causing the crash because of some settings / links in the Morpher Modifier I suppose.

Doing an export selected by selecting another mesh is also causing a crash. The fact that the mesh is in the scene make it crash.

Morpher_Crash.zip

I enclosed a simple scene to help debug it. Let me know if I can help further.

[noalak]

Hi Gil-1,

Bug not reproduced with 2018.0 I get Update 4 and go back to you soon

Some questions:

1. Are you exporting to babylon or glTF format ?
2. The crash occurs while exporting or when loading the output scene inside an engine ?

[Gil-1]

I'm exporting in babylon format and the crash occurs while exporting. I have the green bar moving to something like 10% then Max crashes.

Thanks for testing :)

[Jaskar]

We got the updates today, @noalak will test it next week.

[rlouvat]

Hi Gil-1, I was able to reproduce the crash with your scene on 3DS Max 2018 update 0 and 4. Unfortunately it's a 3DS Max API failure (in the IGame.dll). That's why all 3DS Max crashes... And in the Babylon export I wasn't able to prevent nor detect when this failure can happen.

With @noalak we try to find more information on the bug. Here are what we found:

• as you said, it is linked to the Morpher Modifier of the "Retina" mesh
• after removing your morph targets and creating new ones from a retina clone, we don't get the crash

Thus the issue comes from your morph targets. Can you confirm that targets have as much polygons and vertices as the "Retina" mesh ? Can you provide us the full file with targets ? Are you creating meshes (including targets) in 3ds Max ? Or do you import data from obj / fbx ?

Workaround: export the scene in fbx, then import it into a new scene. Targets are now green and the Babylon export should be successful.

[Gil-1]

Thank you for the investigation !

• Can you confirm that targets have as much polygons and vertices as the "Retina" mesh ? Yes otherwise they wouldn't work in 3ds max.

• Can you provide us the full file with targets ? You can download the scene here http://cynaptek.com/files/Morpher_Crash_002.zip

• Are you creating meshes (including targets) in 3ds Max ? Or do you import data from obj / fbx ? Everything is created inside 3ds max.

Finding a workaround isn't that difficult. The issue is to know where it comes from. Here I gave a simple scene but there are lots of meshes in the original one. So it took some time to know which mesh was causing it :).

I hope the issue is not present in Max 2019 for when we go that road.

[noalak]

Using the complete scene, I found that:

• by creating copies of the targets and assigning those copies as targets instead of the original ones, then the export is fine.
• when creating a copy of the 'Glaucoma_halfeye_morph_retina' mesh, the number of vertices of the cloned mesh displayed is 3 and the Vertex Selection Tool is not active.

My guess is that file corrupted in some way. As said, there is nothing we can do to prevent or warn that from the exporter side. Maybe the Autodesk staff can help you.