Bezier curves behavior change #83117

New Issue

Artem · 2020-11-27T17:16:10+01:00

Artem commented

2020-11-27 17:16:10 +01:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-11-26 23:29, hash: 1709bc5164
Worked: 2.91

Short description of error
Not entirely sure what's happening, but the tangency on bezier handles seems to have changed it's behavior compared to 2.91 (the 2.91 version makes more sense to me)
Look at the image attached and check the yellow line from 2.91 compared to 2.92 (the 2.91 is completely horizontal)

Exact steps for others to reproduce the error

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00 **Blender Version** Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-11-26 23:29, hash: `1709bc5164` Worked: 2.91 **Short description of error** Not entirely sure what's happening, but the tangency on bezier handles seems to have changed it's behavior compared to 2.91 (the 2.91 version makes more sense to me) Look at the image attached and check the yellow line from 2.91 compared to 2.92 (the 2.91 is completely horizontal) **Exact steps for others to reproduce the error** ![Bez.png](https://archive.blender.org/developer/F9390774/Bez.png)

Artem commented

2020-11-27 17:16:10 +01:00

Added subscriber: @Hickz

Hans Goudey commented

2020-11-27 18:16:32 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2020-11-27 18:16:32 +01:00

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

Hans Goudey commented

2020-11-27 18:16:32 +01:00

Thanks for the report. I can't reproduce the issue though:

Could you provide steps to recreate this object or provide a download? Preferably both.

Thanks for the report. I can't reproduce the issue though: ![image.png](https://archive.blender.org/developer/F9391153/image.png) Could you provide steps to recreate this object or provide a download? Preferably both.

Artem commented

2020-11-27 18:25:39 +01:00

In #83117#1063419, @HooglyBoogly wrote:
Thanks for the report. I can't reproduce the issue though:

Could you provide steps to recreate this object or provide a download? Preferably both.

You already did reproduce it. See how the end loop of the tube isn't perpendicular to the handles? in 2.91 it's perfectly perpendicular and makes it a perfect half of a torus.

The one you have is not a perfect half of a torus.

> In #83117#1063419, @HooglyBoogly wrote: > Thanks for the report. I can't reproduce the issue though: > ![image.png](https://archive.blender.org/developer/F9391153/image.png) > Could you provide steps to recreate this object or provide a download? Preferably both. You already did reproduce it. See how the end loop of the tube isn't perpendicular to the handles? in 2.91 it's perfectly perpendicular and makes it a perfect half of a torus. The one you have is not a perfect half of a torus.

Artem commented

2020-11-27 19:00:23 +01:00

One thing i haven't thought about is that you've used 2.91 for your picture. I'm using an older build of 2.91 and this change may have been implemented into the newer builds of 2.91 already.

The one i used is 2.91.0 Beta, branch: master, commit date: 2020-10-22 21:22, hash: baa24f1c91

One thing i haven't thought about is that you've used 2.91 for your picture. I'm using an older build of 2.91 and this change may have been implemented into the newer builds of 2.91 already. The one i used is 2.91.0 Beta, branch: master, commit date: 2020-10-22 21:22, hash: `baa24f1c91`

Hans Goudey commented

2020-11-27 19:12:14 +01:00

Oh, sorry! I forgot which one was old and which new! This should be easy to bisect anyway, I'll try.

Hans Goudey commented

2020-11-27 19:51:14 +01:00

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

Hans Goudey commented

2020-11-27 19:51:14 +01:00

Added subscriber: @ideasman42

Hans Goudey commented

2020-11-27 19:51:14 +01:00

Okay, it turns out this was caused by 4987b7d347, which was then later only reverted in 2.91 by 71ff935fd6

This isn't mentioned anywhere in the release notes for 2.92, and although the commit says that the new behavior is "correct", I don't understand how. I would expect the handles to always be the normal for the cross-section of the bevel.

Confirming this for now, it should either be mentioned in the release notes or changed, but that is up to @campbellbarton.

Okay, it turns out this was caused by 4987b7d347, which was then later only reverted in 2.91 by 71ff935fd6 This isn't mentioned anywhere in the release notes for 2.92, and although the commit says that the new behavior is "correct", I don't understand how. I would expect the handles to always be the normal for the cross-section of the bevel. Confirming this for now, it should either be mentioned in the release notes or changed, but that is up to @campbellbarton.

blender-admin commented

2020-12-08 02:14:27 +01:00

This issue was referenced by 5f1a155a5e

This issue was referenced by 5f1a155a5ef39a4db144b38a607c19b763f965a3

Campbell Barton commented

2020-12-08 02:28:15 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-12-08 02:28:15 +01:00

Campbell Barton self-assigned this 2020-12-08 02:28:15 +01:00

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Bezier curves behavior change #83117