Only one instance shown if object being instanced consists only of verts and edges #89417

New Issue

Miro Horváth · 2021-06-24T20:20:16+02:00

Miro Horváth commented

2021-06-24 20:20:16 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-06-20 22:39, hash: 6afafc46f6
Worked: 2.79

Exact steps for others to reproduce the error

open .blend file
see that there's just one instance in the bottom left corner
unmute Point Distribute node -> result's the same(one instance)
select Cube object and switch to Edit mode -> instances look correct
from the spreadsheet editor it's clear that instances were created
Funnily enough there seems to be a similar issue with particle system https://developer.blender.org/T84710

Test File:
bug.blend

taken from: #92176 (Instanced mesh geometry with no faces are not visible in viewport.)

3.0.0	2.79
3_0a.mp4	2_79.mp4
3_0.blend	2_79.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09 **Blender Version** Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-06-20 22:39, hash: `6afafc46f6` Worked: 2.79 **Exact steps for others to reproduce the error** - open .blend file - see that there's just one instance in the bottom left corner - unmute Point Distribute node -> result's the same(one instance) - select Cube object and switch to Edit mode -> instances look correct - from the spreadsheet editor it's clear that instances were created Funnily enough there seems to be a similar issue with particle system https://developer.blender.org/T84710 Test File: [bug.blend](https://archive.blender.org/developer/F10194861/bug.blend) --- taken from: #92176 (Instanced mesh geometry with no faces are not visible in viewport.) | 3.0.0 | 2.79 | | -- | -- | | [3_0a.mp4](https://archive.blender.org/developer/F11045383/3_0a.mp4) | [2_79.mp4](https://archive.blender.org/developer/F11045419/2_79.mp4) | | [3_0.blend](https://archive.blender.org/developer/F11045389/3_0.blend) | [2_79.blend](https://archive.blender.org/developer/F11045428/2_79.blend) |

Miro Horváth commented

2021-06-24 20:20:16 +02:00

Added subscriber: @MiroHorvath

blender-admin commented

2021-06-24 20:20:16 +02:00

#92885 was marked as duplicate of this issue

blender-admin commented

2021-06-24 20:20:16 +02:00

#92176 was marked as duplicate of this issue

blender-admin commented

2021-06-24 20:20:16 +02:00

#89728 was marked as duplicate of this issue

Miro Horváth changed title from ~~Only one instance placed if object being instanced consists of only vertices~~ to Only one instance shown if object being instanced consists only of vertices

2021-06-24 20:27:07 +02:00

Pratik Borhade commented

2021-06-25 03:51:28 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2021-06-25 03:51:28 +02:00

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

Pratik Borhade commented

2021-06-25 03:51:29 +02:00

I can confirm with present instance object (Cube) but could not replicate the issue from scratch.

Confirming for now.

I can confirm with present instance object (Cube) but could not replicate the issue from scratch. Confirming for now.

Pratik Borhade commented

2021-06-25 04:07:26 +02:00

Found that the problem is only replicable when instance object has all isolated vertices.

Miro Horváth commented

2021-06-25 09:06:41 +02:00

Also, if I add any node from the Attribute category after the Point Instance node, all instances appear again.

Also, if I add any node from the Attribute category after the Point Instance node, all instances appear again. ![image.png](https://archive.blender.org/developer/F10201809/image.png)

Miro Horváth commented

2021-07-08 12:39:16 +02:00

Similar issue with mesh that consists only of edges(no faces) here https://developer.blender.org/T89728

Pratik Borhade commented

2021-07-08 12:58:16 +02:00

Added subscribers: @LuckyChris, @rjg

Pratik Borhade changed title from ~~Only one instance shown if object being instanced consists only of vertices~~ to Only one instance shown if object being instanced consists only of verts and edges

2021-07-08 13:06:37 +02:00

Pratik Borhade commented

2021-10-13 12:06:09 +02:00

Added subscriber: @DenisBelov

Hans Goudey commented

2021-11-06 19:37:36 +01:00

Added subscribers: @Erindale, @HooglyBoogly

Hans Goudey commented

2021-11-10 22:57:14 +01:00

Added subscriber: @fclem

Hans Goudey commented

2021-11-10 22:57:14 +01:00

Hey @fclem, do you have an initial guess of a place to check for this problem? I'm happy to look, but I'm not sure I have a great idea of where to start.

Clément Foucault commented

2021-11-11 15:50:36 +01:00

@HooglyBoogly That is fairly strange. But the issue is likely to be in OVERLAY_wireframe_cache_populate and related to the fast dupli path using OVERLAY_DupliData *dupli. You could check that by bypassing the fast path.

Anyway that's where I would start looking.

@HooglyBoogly That is fairly strange. But the issue is likely to be in `OVERLAY_wireframe_cache_populate` and related to the fast dupli path using `OVERLAY_DupliData *dupli`. You could check that by bypassing the fast path. Anyway that's where I would start looking.

Hans Goudey commented

2021-11-11 16:29:00 +01:00

Thank you!

Hans Goudey commented

2021-11-11 19:21:33 +01:00

Just looking at the bug mentioned in the original report, this appears to be a duplicate of that other bug, so I'll merge this into there. (The "fix" appears to work for both too)

Hans Goudey commented

2021-11-11 19:27:37 +01:00

Closed as duplicate of #84710

Hans Goudey closed this issue

2021-11-11 19:27:37 +01:00

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Only one instance shown if object being instanced consists only of verts and edges #89417