Points instancing - crash. #82880

New Issue

Sergey · 2020-11-20T19:35:07+01:00

Sergey commented

2020-11-20 19:35:07 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.09

Blender Version
Broken: version: 2.92.0 Alpha, branch: geometry-nodes, commit date: 2020-11-20 11:06, hash: 2781e51cda

Short description of error
Probably it's too early to report but just in case I will.

{F9339301, size=full}

untitled1.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.09 **Blender Version** Broken: version: 2.92.0 Alpha, branch: geometry-nodes, commit date: 2020-11-20 11:06, hash: `2781e51cda` **Short description of error** Probably it's too early to report but just in case I will. {[F9339301](https://archive.blender.org/developer/F9339301/2020-11-20_22-30-24.png), size=full} [untitled1.blend](https://archive.blender.org/developer/F9339304/untitled1.blend)

Sergey commented

2020-11-20 19:35:07 +01:00

Added subscriber: @randum

Hans Goudey commented

2020-11-21 02:28:43 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2020-11-21 02:28:43 +01:00

Thanks for the report. I can reproduce the crash with your file, but not if I reproduce the same set of node myself.

The problem seems to be with the recursive instancing, it keeps on creating sets of points. Interestingly it eats up all 32 GB of memory I have before hitting a stack overflow though.

Thanks for the report. I can reproduce the crash with your file, but not if I reproduce the same set of node myself. The problem seems to be with the recursive instancing, it keeps on creating sets of points. Interestingly it eats up all 32 GB of memory I have before hitting a stack overflow though.

Hans Goudey commented

2020-11-21 02:48:46 +01:00

Aha, this is a trick file!
{F9342099 size=full}

The cube isn't actually a Mesh, it's the same object with more instancing on it. It's not actually an infinite loop, it's 40^8 (8 is the maximum instancing recursion) or about 6.5 billion instances that it's trying to make.

Something like this ought to solve the problem:

    if (object != ctx->object) {
      make_recursive_duplis(ctx, object, matrix, i);
    }

But the instances aren't actually showing up for me in this scene right now, not sure why. So I didn't properly test this yet.

Aha, this is a trick file! {[F9342099](https://archive.blender.org/developer/F9342099/image.png) size=full} The cube isn't actually a Mesh, it's the same object with more instancing on it. It's not actually an infinite loop, it's 40^8 (8 is the maximum instancing recursion) or about 6.5 billion instances that it's trying to make. Something like this ought to solve the problem: ``` if (object != ctx->object) { make_recursive_duplis(ctx, object, matrix, i); } ``` But the instances aren't actually showing up for me in this scene right now, not sure why. So I didn't properly test this yet.

Sergey commented

2020-11-21 13:47:54 +01:00

My operation system is closing all programs after several seconds of processing this tree.

Hans Goudey commented

2020-11-23 04:50:51 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Jacques Lucke commented

2020-12-08 17:42:16 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-12-08 17:42:16 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-12-08 17:42:16 +01:00

Jacques Lucke self-assigned this 2020-12-08 17:42:16 +01:00

Jacques Lucke commented

2020-12-08 17:42:16 +01:00

I added a simple check for recursive instancing a couple of days ago. This bug seems to be solved by that. We still don't have a recursive check, that also works with multiple levels of instancing, but that can be added later.

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Points instancing - crash. #82880