Solidify "Thickness" value snaps when scene Units set to "Imperial" at Scale of thousandths (0.001) or less #81552

New Issue

KiJeon · 2020-10-08T20:29:08+02:00

KiJeon commented

2020-10-08 20:29:08 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-30 18:50, hash: 2c317457cb
Seems to be an issue even before the 2.8x+ series.

Short description of error
For some reason, the default Blender units seem to be 1000 times smaller than what it should be, leading to tiny models when exporting .stl files for 3D printing and opening in other programs (e.g. Cura).
So to compensate, I set the "Scene Scale" to 0.001.

An issue arises when I'm working in the "Imperial" Unity System and I try to change the Solidify Thickness value on an object.
Instead of smoothly changing values, it snaps between only two values (e.g. -0.393701" and 0.393701")

This issue goes away when simply changing the Unit System to "Metric", but this isn't ideal because I tend to work with measurements in inches for my models.

Exact steps for others to reproduce the error

Change Unit System to "Imperial".
Change Unit Scale to "0.001" or lower.
Create an object and add a Solidify Modifier.
Try changing the Thickness value.

Test file: ImperialScaleIssue.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00 **Blender Version** Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-30 18:50, hash: `2c317457cb` Seems to be an issue even before the 2.8x+ series. **Short description of error** For some reason, the default Blender units seem to be 1000 times smaller than what it should be, leading to tiny models when exporting .stl files for 3D printing and opening in other programs (e.g. Cura). So to compensate, I set the "Scene Scale" to 0.001. An issue arises when I'm working in the "Imperial" Unity System and I try to change the Solidify Thickness value on an object. Instead of smoothly changing values, it snaps between only two values (e.g. -0.393701" and 0.393701") This issue goes away when simply changing the Unit System to "Metric", but this isn't ideal because I tend to work with measurements in inches for my models. **Exact steps for others to reproduce the error** 1. Change Unit System to "Imperial". 2. Change Unit Scale to "0.001" or lower. 3. Create an object and add a Solidify Modifier. 4. Try changing the Thickness value. Test file: [ImperialScaleIssue.blend](https://archive.blender.org/developer/F8968679/ImperialScaleIssue.blend)

KiJeon commented

2020-10-08 20:29:08 +02:00

Added subscriber: @0o00o0oo

Germano Cavalcante commented

2020-10-11 23:08:02 +02:00

Added subscribers: @HDMaster84, @mano-wii

Germano Cavalcante commented

2020-10-11 23:08:02 +02:00

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

Germano Cavalcante commented

2020-10-11 23:08:02 +02:00

Thanks for the report, I can confirm the bug.

@HDMaster84, Is this something for you?

Thanks for the report, I can confirm the bug. @HDMaster84, Is this something for you?

Henrik D. commented

2020-10-12 10:15:40 +02:00

This is not specific to solidify. It also occurs with other sliders that are using the length unit like the merge threshold in mirror modifier and in weld modifier.
It occurs in imperial when the unit scale is smaller than 0.001.
For metric it happens with a scale of 0.00001.

Note: the weird stepsizes occur exactly when there is a length smaller than 1 thou/µm. Lengths smaller than 1 thou/µm are strangely enough displayed in the base unit (feet/m by default).
Also Note: for metric it is even weirder because at a scale of 0.00001 it shows actual wrong values.

The issue is somewhere in the execution of ui_get_but_step_unit in interface.c but probably deeper in the unit system.

This is not specific to solidify. It also occurs with other sliders that are using the length unit like the merge threshold in mirror modifier and in weld modifier. It occurs in imperial when the unit scale is smaller than 0.001. For metric it happens with a scale of 0.00001. Note: the weird stepsizes occur exactly when there is a length smaller than 1 thou/µm. Lengths smaller than 1 thou/µm are strangely enough displayed in the base unit (feet/m by default). Also Note: for metric it is even weirder because at a scale of 0.00001 it shows actual wrong values. The issue is somewhere in the execution of `ui_get_but_step_unit` in `interface.c` but probably deeper in the unit system.

Germano Cavalcante commented

2020-10-12 15:29:21 +02:00

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

Germano Cavalcante commented

2020-10-12 15:29:21 +02:00

So this is a problem with all sliders that use the unit system?
In this case, the report must be edited and directed to the #user_interface team.

So this is a problem with all sliders that use the unit system? In this case, the report must be edited and directed to the #user_interface team.

Henrik D. commented

2020-10-12 23:10:16 +02:00

new bug report with this issue with the correct project: #81664.
related #81663.

new bug report with this issue with the correct project: #81664. related #81663.

Germano Cavalcante commented

2020-10-12 23:16:55 +02:00

Thanks for the reports @HDMaster84 :)
I will merge this one into the #81664 then.

Thanks for the reports @HDMaster84 :) I will merge this one into the #81664 then.

Germano Cavalcante commented

2020-10-12 23:17:10 +02:00

Closed as duplicate of #81664

Germano Cavalcante closed this issue

2020-10-12 23:17:10 +02:00

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Solidify "Thickness" value snaps when scene Units set to "Imperial" at Scale of thousandths (0.001) or less #81552