Knife tool renders future points incorrectly once again #83391

New Issue

Stanislav Blinov · 2020-12-04T10:13:19+01:00

Stanislav Blinov commented

2020-12-04 10:13:19 +01:00

System Information
Operating system: Linux 5.9.10-arch1-1
Graphics card: NVIDIA GTX 980Ti (455.45.01)

Blender Version
Broken: 2.91, 2.92
Worked: 2.90.1
Caused by b902edae75

Short description of error

Knife tool, depending on pointer position (possibly in relation to geometry) sometimes renders future cuts and points at incorrect locations (mid edges, origin...). An issue similar in appearance has already been fixed some time ago: #71578. This happens in both ortho and perspective view, but does not seem to occur if X-Ray is turned on.

Video .

Exact steps for others to reproduce the error

Attempt to use knife tool on the default cube or a plane located at world origin, starting a cut and moving the pointer carefully over various edges and vertices.

**System Information** Operating system: Linux 5.9.10-arch1-1 Graphics card: NVIDIA GTX 980Ti (455.45.01) **Blender Version** Broken: 2.91, 2.92 Worked: 2.90.1 Caused by b902edae75 **Short description of error** Knife tool, depending on pointer position (possibly in relation to geometry) sometimes renders future cuts and points at incorrect locations (mid edges, origin...). An issue similar in appearance has already been fixed some time ago: #71578. This happens in both ortho and perspective view, but does not seem to occur if X-Ray is turned on. [Video ](https://youtu.be/DNsYPZQtyGo). **Exact steps for others to reproduce the error** Attempt to use knife tool on the default cube or a plane located at world origin, starting a cut and moving the pointer carefully over various edges and vertices.

Stanislav Blinov commented

2020-12-04 10:13:19 +01:00

Added subscriber: @Stan_Pancakes

Robert Guetzkow commented

2020-12-04 10:37:18 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2020-12-04 10:37:18 +01:00

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

Robert Guetzkow commented

2020-12-04 10:37:18 +01:00

I can reproduce the jumping when placing the first point on a corner and then moving along one of the edges. This does indeed not happen in 2.90.1.

Hans Goudey commented

2020-12-04 17:58:15 +01:00

Added subscriber: @HooglyBoogly

Hans Goudey commented

2020-12-04 17:58:15 +01:00

I bisected, this is caused by b902edae75

I bisected, this is caused by b902edae75

Janusch Patas commented

2020-12-25 01:18:45 +01:00

Added subscriber: @patjan

Janusch Patas commented

2020-12-25 14:00:41 +01:00

Initially, I provided a small patch in D9509 that fixes #83831 and does not produce the bug described in this task. I just applied it again and tested it successfully. However, it was abandoned and I don't understand exactly why. In D9509 you can find a short discussion where I made a concern about zeroing the coordinates. Maybe, I was not completely wrong.

Initially, I provided a small patch in [D9509](https://archive.blender.org/developer/D9509) that fixes #83831 and does not produce the bug described in this task. I just applied it again and tested it successfully. However, it was abandoned and I don't understand exactly why. In [D9509](https://archive.blender.org/developer/D9509) you can find a short discussion where I made a concern about zeroing the coordinates. Maybe, I was not completely wrong.

Janusch Patas self-assigned this 2020-12-25 14:13:08 +01:00

Janusch Patas commented

2020-12-25 14:13:08 +01:00

I have updated the patch in D9931. Maybe, it helps to resolve this issue.

I have updated the patch in [D9931](https://archive.blender.org/developer/D9931). Maybe, it helps to resolve this issue.

Evan Wilson commented

2021-03-29 01:18:59 +02:00

Added subscriber: @EAW