Sculpt Brush Cursor SHRINKS or GROWS during resize when Object Origin is NOT at World Origin #121404

New Issue

Adam Janz · 2024-05-03T18:58:45+02:00

Adam Janz commented

2024-05-03 18:58:45 +02:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.23

Blender Version
Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: e1743a0317bc
Also broken: version: 3.6.8, branch: blender-v3.6-release, commit date: 2024-01-15 12:55, hash: f6ae60f3eeda
Worked: Unknown

Short description of error
When an object's origin is not at 0,0,0, and the brush radius unit is set to "Scene", the cursor either shrinks or grows when attempting to resize the brush with "F". If the object's origin is POSITIVE units away from the World Origin (0,0,0), the cursor will GROW, and if the object's origin is NEGATIVE units away from the World Origin the cursor will SHRINK. The further away, the more pronounced the effect. This bug makes it very difficult to guess what the final brush size will be during a resize.

Exact steps for others to reproduce the error

Open a new .blend file.
Select the default cube, ensure its location is 0,0,0 and enter Sculpt Mode.
Under Brush Settings, set your Radius Unit to "Scene".
Resize your brush a few times with "F", and observe the cursor's starting scale is equal to the existing brush size.
Enter Object Mode.
Press G, Y, 5 to move the default cube positive 5 meters in the Y-Axis.
Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes enormous, instead of showing the correct diameter of your current brush.
Enter Object Mode again.
Clear the default cube's location with Alt+G, and then press G,Y, -5 to move it negative 5 meters in the Y-Axis.
Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes smaller, instead of showing the correct diameter of your current brush.
Now, observe your current cursor's scale when pressing "F", but do not actually resize the brush, just right-click to cancel.
Enter Object Mode again and this time move the default cube an additional -10 meters in the Y-Axis (its location will read 0, -15, 0).
Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes exceedingly tiny, demonstrating that the further the object's origin is away from the World Origin, the more exaggerated the effect becomes.

Thank you very much for looking into this.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 536.23 **Blender Version** Broken: version: 4.1.1, branch: blender-v4.1-release, commit date: 2024-04-15 15:11, hash: `e1743a0317bc` Also broken: version: 3.6.8, branch: blender-v3.6-release, commit date: 2024-01-15 12:55, hash: `f6ae60f3eeda` Worked: Unknown **Short description of error** When an object's origin is not at 0,0,0, and the brush radius unit is set to "Scene", the cursor either **shrinks or grows** when attempting to resize the brush with "F". If the object's origin is **POSITIVE** units away from the World Origin (0,0,0), the cursor will **GROW**, and if the object's origin is **NEGATIVE** units away from the World Origin the cursor will **SHRINK**. **The further away, the more pronounced the effect.** This bug makes it **very difficult to guess** what the final brush size will be during a resize. **Exact steps for others to reproduce the error** 1. Open a new .blend file. 2. Select the default cube, ensure its location is 0,0,0 and enter Sculpt Mode. 3. Under Brush Settings, set your Radius Unit to "Scene". 4. Resize your brush a few times with "F", and observe the cursor's starting scale is **equal** to the existing brush size. 5. Enter Object Mode. 6. Press G, Y, 5 to move the default cube **positive** 5 meters in the Y-Axis. 7. Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes **enormous**, instead of showing the correct diameter of your current brush. 8. Enter Object Mode again. 9. Clear the default cube's location with Alt+G, and then press G,Y, -5 to move it **negative** 5 meters in the Y-Axis. 10. Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes **smaller**, instead of showing the correct diameter of your current brush. 11. Now, observe your current cursor's scale when pressing "F", but do not actually resize the brush, just right-click to cancel. 12. Enter Object Mode again and this time move the default cube an additional -10 meters in the Y-Axis (its location will read 0, -15, 0). 13. Re-enter Sculpt Mode, and attempt to resize your brush with F. Observe that the cursor now becomes exceedingly **tiny**, demonstrating that the further the object's origin is away from the World Origin, the more exaggerated the effect becomes. Thank you very much for looking into this.

Adam Janz added the

labels 2024-05-03 18:58:46 +02:00

Adam Janz referenced this issue

2024-05-03 21:12:32 +02:00

Sculpting Brush size becomes too big or too small outside the object when the radius unit is in scene #111647

Pratik Borhade commented

2024-05-04 09:11:07 +02:00

Hi, thanks for the report. Not sure where the issue is. In every case, starting scale is always same as the diameter.
Could you maybe attach small screen recording to demonstrate the issue?

Hi, thanks for the report. Not sure where the issue is. In every case, starting scale is always same as the diameter. Could you maybe attach small screen recording to demonstrate the issue?

Pratik Borhade added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2024-05-04 09:11:28 +02:00

Adam Janz commented

2024-05-05 00:09:16 +02:00

@PratikPB2123 No problem, Pratik! Make sure your Brush Settings have the Radius Unit set to "Scene", otherwise you will not see the effect. It's worth noting that you can actually see both the grow AND shrink effect depending on what side of the default cube you are attempting to change your brush size on. On any object sides which are parallel to the axis you moved the object in (as described in Step 6), the effect may be less noticeable, but on perpendicular sides, the effect will be very obvious. If you're still not able to reproduce the bug on your end, I can send a screen recording probably on Monday.

@PratikPB2123 No problem, Pratik! Make sure your Brush Settings have the Radius Unit set to "Scene", otherwise you will not see the effect. It's worth noting that you can actually see both the grow AND shrink effect depending on what side of the default cube you are attempting to change your brush size on. On any object sides which are **parallel** to the axis you moved the object in (as described in Step 6), the effect may be less noticeable, but on perpendicular sides, the effect will be very obvious. If you're still not able to reproduce the bug on your end, I can send a screen recording probably on Monday.

Adam Janz commented

2024-05-08 20:09:08 +02:00

@PratikPB2123 Hi Pratik, just checking in if you were able to recreate the bug after following the notes in my last reply (ensure brush radius unit set to "Scene")? On my end, I'm consistently able to reproduce it in a new blank project. Thanks