Brush settings > Texture > Mapping mode Area Plane creates a smaller mapping, cause tiling effect. #109992

New Issue

Apraxas · 2023-07-12T03:27:44+02:00

Apraxas commented

2023-07-12 03:27:44 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 526.47

Blender Version
Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: c7fc78b81ecb
Broken also: version: 3.6.1 Release Candidate, branch: blender-v3.6-release, commit date: 2023-07-11 13:57, hash: 0a13a7841c27
Broken also: version: 4.0.0 Alpha, branch: main, commit date: 2023-07-11 20:50, hash: c728fa0663b6

Worked: version: 3.3.8, branch: master, commit date: 2023-06-21 15:18, hash: 9b3a508cd511

Problem:

Brush settings > Texture > Mapping mode Area Plane creates a smaller mapping cause tiling effect.

Previously, Area Plane and View Plane will create the same dab size.

Exact steps for others to reproduce the error

Load This File in 3.5, draw, feature appears to be normal.
do the same thing in 3.6, feature appears to be a bit smaller and getting tiled.

Original description:

There appears to be a bug in the falloff when using Alpha brushes, as it causes a tiling effect at the edges, most noticeable when it is set to constant.

However, this issue does not occur in older versions of blender (It is unclear when this bug was introduced)
Tested on 3.3.8 by opening the exact same blender file, with identical brush settings.

3.6/4.0	3.5 and previous

A work around I found was to edit the falloff like below, but since this issue doesn't happen in older versions, I can only assume it is a bug. (There is the chance the issue has nothing to do with the falloff and instead it is about how blender is reading the texture, but I've got no clue)

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 526.47 **Blender Version** Broken: version: 3.6.0, branch: blender-v3.6-release, commit date: 2023-06-27 08:08, hash: `c7fc78b81ecb` Broken also: version: 3.6.1 Release Candidate, branch: blender-v3.6-release, commit date: 2023-07-11 13:57, hash: `0a13a7841c27` Broken also: version: 4.0.0 Alpha, branch: main, commit date: 2023-07-11 20:50, hash: `c728fa0663b6` Worked: version: 3.3.8, branch: master, commit date: 2023-06-21 15:18, hash: `9b3a508cd511` Problem: `Brush settings > Texture > Mapping` mode `Area Plane` creates a smaller mapping cause tiling effect. Previously, `Area Plane` and `View Plane` will create the same dab size. **Exact steps for others to reproduce the error** - Load [This File](https://projects.blender.org/attachments/25339554-897a-4926-9d4c-506f8370676d) in 3.5, draw, feature appears to be normal. - do the same thing in 3.6, feature appears to be a bit smaller and getting tiled. -------- **Original description:** There appears to be a bug in the falloff when using Alpha brushes, as it causes a tiling effect at the edges, most noticeable when it is set to constant. However, this issue does not occur in older versions of blender (It is unclear when this bug was introduced) Tested on 3.3.8 by opening the exact same blender file, with identical brush settings. | 3.6/4.0 | 3.5 and previous | |--|--| | ![image](/attachments/fda02627-bb0b-4422-a5c1-6b8509bbf2d5) | ![image](/attachments/50398eb4-8c38-434b-934b-08fa5b309f76) | A work around I found was to edit the falloff like below, but since this issue doesn't happen in older versions, I can only assume it is a bug. (There is the chance the issue has nothing to do with the falloff and instead it is about how blender is reading the texture, but I've got no clue) ![image](/attachments/ffd6acb4-5fe9-417a-b768-f28f14696037)

Bugged Falloff.blend

6.2 MiB

image.png

358 KiB

image.png

674 KiB

image.png

714 KiB

Apraxas added the

labels 2023-07-12 03:27:45 +02:00

YimingWu commented

2023-07-12 05:01:39 +02:00

I believe you are using an older brush set/texture configuration. There's a "Vector Displacement" option added inside "Texture"drop-down menu but it's not enabled by default, it has caused confusion before. Very likely the same cause as #106814

Apraxas commented

2023-07-12 05:15:15 +02:00

Hi. Thank you for checking, but I don't believe the issue has to do with the VDM setting being On or Off.

This issue is happening with brushes using normal alpha textures, not Vector Displacement Maps.
In fact, turning on the VDM checkbox would only make the brush act incorrectly.

Extra info: The same issue happens even if I remake the brush from scratch by opening the alpha texture and setting everything manually, so it has nothing to do with appending issues either.

Hi. Thank you for checking, but I don't believe the issue has to do with the VDM setting being On or Off. This issue is happening with brushes using normal alpha textures, not Vector Displacement Maps. In fact, turning on the VDM checkbox would only make the brush act incorrectly. Extra info: The same issue happens even if I remake the brush from scratch by opening the alpha texture and setting everything manually, so it has nothing to do with appending issues either. ![image](/attachments/33b316c9-8199-4ce5-93c1-de95df406050)

image.png

427 KiB

YimingWu commented

2023-07-12 05:32:59 +02:00

@Apraxas Ok I see. So the "small bump" on top of the sphere are made by a different brush right? Your blend file didn't pack the texture so we could not check. Could you upload the blend file with packed texture by using File > External Data > Pack Resources? Also you could delete the sphere so the file is smaller.

From the screenshot I feel this might be a problem with normal.

@Apraxas Ok I see. So the "small bump" on top of the sphere are made by a different brush right? Your blend file didn't pack the texture so we could not check. Could you upload the blend file with packed texture by using `File > External Data > Pack Resources`? Also you could delete the sphere so the file is smaller. From the screenshot I feel this might be a problem with normal.

Apraxas commented

2023-07-12 05:41:08 +02:00

@ChengduLittleA
Heya! Thank you. I appreciate your taking the time to check this issue.

I have done as indicated and uploaded a new file. (You'll have to subdivide the bare bones sphere yourself, though)

@ChengduLittleA Heya! Thank you. I appreciate your taking the time to check this issue. I have done as indicated and uploaded a new file. (You'll have to subdivide the bare bones sphere yourself, though)

Bugged Falloff.blend

6.2 MiB

YimingWu commented

2023-07-12 05:51:45 +02:00

Ok I see. Now I understood you meant that the small bumps are wrongly tiled and should not be visible. Yes can confirm that under 3.6.0

Compared to 3.5, the broken brush seems to be "smaller" (can be verified from looking at the distance from the tip of the bump to the cursor).

Ok I see. Now I understood you meant that the small bumps are wrongly tiled and should not be visible. Yes can confirm that under 3.6.0 Compared to 3.5, the broken brush seems to be "smaller" (can be verified from looking at the distance from the tip of the bump to the cursor).

Apraxas commented

2023-07-12 05:54:10 +02:00

Thank you. I have tested several alpha textures that worked perfectly on 3.3.8, and almost all of them have some issue or other, like small holes at the edges (if the brush is supposed to carve into the mesh) or bumps like this one (if it is supposed to displace it upwards)

YimingWu added

Module

Sculpt, Paint & Texture

and removed

labels 2023-07-12 05:54:46 +02:00

YimingWu commented

2023-07-12 05:57:56 +02:00

Two ways to mitigate this issue for now under 3.6:

Change Brush settings tab > Texture > Mapping from Area Plane to View Plane (This also fixes the dab size issue, so suspect "Area Plane" mode is problematic)
Change Texture Settings tab > Image > Mapping from Repeat to Clip or Extend (This will keep the dab size a tad smaller than normal)

Two ways to mitigate this issue for now under 3.6: - Change `Brush settings tab > Texture > Mapping` from `Area Plane` to `View Plane` (This also fixes the dab size issue, so suspect "Area Plane" mode is problematic) - Change `Texture Settings tab > Image > Mapping` from `Repeat` to `Clip` or `Extend` (This will keep the dab size a tad smaller than normal)

👍 1 🎉 1

YimingWu changed title from ~~Alpha Brushes - Falloff bugged and causes tiling~~ to `Brush settings > Texture > Mapping` mode `Area Plane` creates a smaller mapping, cause tiling effect.

2023-07-12 06:03:34 +02:00

Philipp Oeser commented

2023-07-12 13:00:31 +02:00

Would assume this is related to #106895?

Philipp Oeser commented

2023-07-12 13:02:59 +02:00

@JulienKaspar : ^^

Julien Kaspar commented

2023-07-12 13:44:34 +02:00

@lichtwerk You're right. Also #109201 was made to resolve this issue.

But I see a separate bug that this report highlights. Area & View Plane should be consistent, but they are not. The report can stay open for that 👍

Since these fixes should be done for 4.0 I'll raise the priority.

@lichtwerk You're right. Also #109201 was made to resolve this issue. But I see a separate bug that this report highlights. Area & View Plane should be consistent, but they are not. The report can stay open for that 👍 Since these fixes should be done for 4.0 I'll raise the priority.

👍 1

Julien Kaspar added

and removed

labels 2023-07-12 13:45:08 +02:00