Random Point Distribution method create obvious distribution pattern relative to emitter mesh #86012

New Issue

DorianB · 2021-02-26T11:45:42+01:00

DorianB commented

2021-02-26 11:45:42 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-25 05:34, hash: 0e1c6a29cb

Short description of error
Check this image/File below
My distribution is all bad, it's a simple subdivided plane and we can clearly see pattern near edges/tris

baddistribution.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-25 05:34, hash: `0e1c6a29cb` **Short description of error** Check this image/File below My distribution is all bad, it's a simple subdivided plane and we can clearly see pattern near edges/tris ![Capture d’écran 2021-02-26 105510.png](https://archive.blender.org/developer/F9841605/Capture_d_écran_2021-02-26_105510.png) [baddistribution.blend](https://archive.blender.org/developer/F9841607/baddistribution.blend)

DorianB commented

2021-02-26 11:45:42 +01:00

Added subscriber: @dodododorian

DorianB commented

2021-02-26 11:48:38 +01:00

![ddd.gif](https://archive.blender.org/developer/F9841617/ddd.gif)

DorianB changed title from ~~Random Point Distribution method create obvious distribution pattern due to emitter mesh~~ to Random Point Distribution method create obvious distribution pattern relative to emitter mesh

2021-02-26 11:49:08 +01:00

DorianB commented

2021-02-26 11:51:17 +01:00

![ddd.gif](https://archive.blender.org/developer/F9841634/ddd.gif)

Philipp Oeser commented

2021-02-26 12:25:55 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-02-26 12:25:55 +01:00

First notes:

points distribution is actually fine
pattern results from the following:
- the instanced object origin is not at the center of geometry
- the points have opposing orientation
  - this means some of the instances are shifted in one direction, some are shifted in the opposite direction (this results in the pattern)

solutions:

put the origin in the center of geometry
align all points rotations to be the same (trying this atm, does not seem to be straight forward?)

First notes: - points distribution is actually fine - pattern results from the following: - the instanced object origin is not at the center of geometry - the points have opposing orientation - this means some of the instances are shifted in one direction, some are shifted in the opposite direction (this results in the pattern) ![image.png](https://archive.blender.org/developer/F9841704/image.png) solutions: - put the origin in the center of geometry - align all points rotations to be the same (trying this atm, does not seem to be straight forward?)

Jacques Lucke commented

2021-02-26 12:33:05 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-02-26 12:33:05 +01:00

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

Jacques Lucke closed this issue

2021-02-26 12:33:05 +01:00

Jacques Lucke commented

2021-02-26 12:33:05 +01:00

The distribution is actually working fine here. What you see is a combination of two issues:

Points have different rotations. In fact, there are exactly two different rotations. This might be solved by using tangents at some point, but I wouldn't bet on it.
Your Suzanne instance is not centered at the origin. Therefore half of the instances will be moved in one direction, and half will move in another direction, resulting in the visible artifacts.

There are two possible solutions for you:

Put an Align Rotation to Vector node after the Point Distribute node and use it to align the X axis to the (1, 0, 0) vector.
Set the origin of the instance to the center of the geometry.

The distribution is actually working fine here. What you see is a combination of two issues: * Points have different rotations. In fact, there are exactly two different rotations. This might be solved by using tangents at some point, but I wouldn't bet on it. * Your Suzanne instance is not centered at the origin. Therefore half of the instances will be moved in one direction, and half will move in another direction, resulting in the visible artifacts. There are two possible solutions for you: * Put an Align Rotation to Vector node after the Point Distribute node and use it to align the X axis to the (1, 0, 0) vector. * Set the origin of the instance to the center of the geometry.

Jacques Lucke commented

2021-02-26 12:33:52 +01:00

Haha nice work @lichtwerk, funny how similar our responses are :D

Leon Schittek commented

2021-02-26 12:36:36 +01:00

Added subscriber: @lone_noel

Leon Schittek commented

2021-02-26 12:36:36 +01:00

This comment was removed by @lone_noel

*This comment was removed by @lone_noel*

Philipp Oeser commented

2021-02-26 12:48:37 +01:00

Changed status from 'Archived' to: 'Needs User Info'

Philipp Oeser reopened this issue

2021-02-26 12:48:37 +01:00

Philipp Oeser commented

2021-02-26 12:48:37 +01:00

OK, so here are those points / instances oriented equally:
baddistribution_oriented_equally.blend

Distribution seems fine.
Is this working for you?

OK, so here are those points / instances oriented equally: [baddistribution_oriented_equally.blend](https://archive.blender.org/developer/F9841780/baddistribution_oriented_equally.blend) Distribution seems fine. Is this working for you?

Philipp Oeser commented

2021-02-26 13:02:00 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Philipp Oeser closed this issue

2021-02-26 13:02:00 +01:00

Philipp Oeser commented

2021-02-26 13:02:00 +01:00

Ha, refreshing the thread now, we have a matching view of the issue indeed @JacquesLucke .

So yeah, we can actually close this (but feel free to comment again if issues persist, @dodododorian)

Ha, refreshing the thread now, we have a matching view of the issue indeed @JacquesLucke . So yeah, we can actually close this (but feel free to comment again if issues persist, @dodododorian)

DorianB commented

2021-02-26 15:03:33 +01:00

Indeed the normal rotation and far away origin are not a good mix!
It indeed makes a lot of sense, once we reset the rotation there's no more patterns

Sorry for the false alarm
TBH I would not find this out without your help!

Indeed the normal rotation and far away origin are not a good mix! It indeed makes a lot of sense, once we reset the rotation there's no more patterns Sorry for the false alarm TBH I would not find this out without your help!

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Random Point Distribution method create obvious distribution pattern relative to emitter mesh #86012