Asymmetric position vertices in circles primitives. Non-symmetrical edges in circles #87779

New Issue

Vladimir · 2021-04-24T12:42:47+02:00

Vladimir commented

2021-04-24 12:42:47 +02:00

System Information
Operating system: Linux-5.11.16-2-MANJARO-x86_64-with-glibc2.33 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.0.3

Blender Version
Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-23 20:24, hash: aa95f8019e
Worked: (newest version of Blender that worked as expected)

Short description of error
Operation which creation of circles such as Add->Mesh->Circle, Add->Mesh->Cylinder after applying have asymmetric position of vertices, which can give unexpected results such as Boolean operation with the selected Exact method.

I created two circles - A and B. Circle A was created from menu Add->Mesh->Circle with radius equals 50 mm. You can see on image that parallel vertices top and bottom has asymmetric position. Also, the asymmetric arrangement of the vertices gives different lengths between the parallel vertices, which indicates that the circle has non-symmetrical edges. It shown on next image.

Additionally, for comparison I created second circle B from one quarter of circle and mirrored by X and Y axes for symmetric. Circle B has symmetric position of vertices and also symmetric edges and correct radius.

precission.blend

This issue can affect in boolean operations with Exact option and give unexpected result when parts of meshes arrange symmetric, for example:

exact-boolean.blend

Also I added to the file object created from correct circle primitives and I got expected result of Boolean operation:

However, I noticed that the inaccuracy can see when use the millimeters system of measurement. If you switch to another system, asymmetric values you don't see but the issue will remain. What units use for calculates inside Blender?

Exact steps for others to reproduce the error

**System Information** Operating system: Linux-5.11.16-2-MANJARO-x86_64-with-glibc2.33 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 4600 (HSW GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 21.0.3 **Blender Version** Broken: version: 2.93.0 Beta, branch: master, commit date: 2021-04-23 20:24, hash: `aa95f8019e` Worked: (newest version of Blender that worked as expected) **Short description of error** Operation which creation of circles such as `Add->Mesh->Circle`, `Add->Mesh->Cylinder` after applying have asymmetric position of vertices, which can give unexpected results such as Boolean operation with the selected Exact method. I created two circles - `A` and `B`. Circle `A` was created from menu `Add->Mesh->Circle` with radius equals 50 mm. You can see on image that parallel vertices top and bottom has asymmetric position. Also, the asymmetric arrangement of the vertices gives different lengths between the parallel vertices, which indicates that the circle has non-symmetrical edges. It shown on next image. Additionally, for comparison I created second circle `B` from one quarter of circle and mirrored by `X` and `Y` axes for symmetric. Circle `B` has symmetric position of vertices and also symmetric edges and correct radius. ![Screenshot_20210424_125914.png](https://archive.blender.org/developer/F10035319/Screenshot_20210424_125914.png) [precission.blend](https://archive.blender.org/developer/F10035322/precission.blend) This issue can affect in boolean operations with Exact option and give unexpected result when parts of meshes arrange symmetric, for example: ![Screenshot_20210424_131520.png](https://archive.blender.org/developer/F10035324/Screenshot_20210424_131520.png) ![Screenshot_20210424_131612.png](https://archive.blender.org/developer/F10035326/Screenshot_20210424_131612.png) [exact-boolean.blend](https://archive.blender.org/developer/F10035491/exact-boolean.blend) Also I added to the file object created from correct circle primitives and I got expected result of Boolean operation: ![Screenshot_20210424_165645.png](https://archive.blender.org/developer/F10035494/Screenshot_20210424_165645.png) However, I noticed that the inaccuracy can see when use the millimeters system of measurement. If you switch to another system, asymmetric values you don't see but the issue will remain. What units use for calculates inside Blender? **Exact steps for others to reproduce the error**

Vladimir commented

2021-04-24 12:42:47 +02:00

Added subscriber: @Wovchick

blender-admin commented

2021-04-24 12:42:47 +02:00

#87937 was marked as duplicate of this issue

Vladimir changed title from ~~Asymmetric position vertices in circles. Non-symmetrical edges in circles~~ to Asymmetric position vertices when created primitives of circles. Non-symmetrical edges in circles

2021-04-24 13:33:05 +02:00

Vladimir changed title from ~~Asymmetric position vertices when created primitives of circles. Non-symmetrical edges in circles~~ to Asymmetric position vertices in primitives of circles. Non-symmetrical edges in circles

2021-04-24 13:35:13 +02:00

Vladimir changed title from ~~Asymmetric position vertices in primitives of circles. Non-symmetrical edges in circles~~ to Asymmetric position vertices in circles primitives. Non-symmetrical edges in circles

2021-04-24 16:04:44 +02:00

blender-admin commented

2021-04-29 16:22:02 +02:00

This issue was referenced by 5946352ae2

This issue was referenced by 5946352ae2cd3ef14d8af07f8d4bd047954b9fd1

Campbell Barton commented

2021-04-29 16:25:55 +02:00

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

Campbell Barton closed this issue

2021-04-29 16:25:55 +02:00

Campbell Barton self-assigned this 2021-04-29 16:25:55 +02:00

Vladimir commented

2021-04-30 07:41:15 +02:00

Hello!

I checked resolve of issue and now this issue very well resolved with horizontal symmetric vertices of circle, they have now symmetric position of vertices but... sides of vertical vertices, left and right sides remained have difference. Edges left and right have different length because vertices don't is symmetric. See the third circle in the picture.

precision-circle.blend

It can be fixed? Thank You!

Hello! I checked resolve of issue and now this issue very well resolved with horizontal symmetric vertices of circle, they have now symmetric position of vertices but... sides of vertical vertices, left and right sides remained have difference. Edges left and right have different length because vertices don't is symmetric. See the third circle in the picture. ![Screenshot_20210430_082632.png](https://archive.blender.org/developer/F10046462/Screenshot_20210430_082632.png) [precision-circle.blend](https://archive.blender.org/developer/F10046464/precision-circle.blend) It can be fixed? Thank You!

Hans Goudey commented

2021-04-30 18:41:59 +02:00

Changed status from 'Resolved' to: 'Confirmed'

Hans Goudey reopened this issue

2021-04-30 18:41:59 +02:00

Hans Goudey commented

2021-04-30 18:42:30 +02:00

Added subscriber: @HooglyBoogly

Vladimir commented

2021-05-13 21:03:29 +02:00

While this issue resolving developers, I created add-on which creating symmetric circle. If anybody interested it than you can download and install its from https://github.com/microcoder/SymmetricPrimitives

blender-admin commented

2022-07-22 05:57:04 +02:00

This issue was referenced by 087f27a52f

This issue was referenced by 087f27a52f7857887e90754d87a7a73715ebc3fb

Campbell Barton commented

2022-07-22 06:00:38 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2022-07-22 06:00:38 +02:00

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Asymmetric position vertices in circles primitives. Non-symmetrical edges in circles #87779