Accurate alpha texture opacity issue #105700

New Issue

Anoca · 2023-03-12T19:48:48+01:00

Anoca commented

2023-03-12 19:48:48 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GT 1030/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 527.56

Blender Version
3.4.1

Short description of error
Blender seems to have an issue when it comes to painting alpha texture layer maps. When you first paint it on the mesh it comes out fine and accurate. But the moment you save the image texture, you loose all that progress.

Attempting to save the image texture first and then paint won't do much either, it will still come out broken the next time you open blender.

I do not remember if this has happened in the previous versions which I have texture painted some models.

I also tried dragging all the stuff from the current blend file to a new one, results are still the same.

I'm completely out of ideas of what else it could make this happen.

Here's how it comes out before saving:

And here is after saving:

I sincerely can't work with texture painting like this.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GT 1030/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 527.56 **Blender Version** 3.4.1 **Short description of error** Blender seems to have an issue when it comes to painting alpha texture layer maps. When you first paint it on the mesh it comes out fine and accurate. But the moment you save the image texture, you loose all that progress. Attempting to save the image texture first and then paint won't do much either, it will still come out broken the next time you open blender. I do not remember if this has happened in the previous versions which I have texture painted some models. I also tried dragging all the stuff from the current blend file to a new one, results are still the same. I'm completely out of ideas of what else it could make this happen. Here's how it comes out before saving: ![Screenshot_4.png](/attachments/65e0a23a-d386-4b1e-98b6-30554f5efa72) And here is after saving: ![Screenshot_5.png](/attachments/6690bb09-5bbc-44aa-8fc1-a7e6c49d7358) I sincerely can't work with texture painting like this.

Screenshot_5.png

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Screenshot_4.png

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Anoca added the

labels 2023-03-12 19:48:48 +01:00

Pratik Borhade commented

2023-03-13 06:21:32 +01:00

Hi, thanks for the report. Please share .blend file with steps to redo the issue.

Pratik Borhade added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-03-13 06:21:44 +01:00

Anoca commented

2023-03-13 08:50:11 +01:00

Hi, thanks for the report. Please share .blend file with steps to redo the issue.

I tried doing one more thing I haven't tried last night before I was gonna send the blend file.
It seems like there is something wrong with the mix node.

Using the alpha texture map with the mix node actually breaks the alpha opacity, completely keeping the alpha value on the mesh on an integer strength. Not sure why that happens.

Using the alpha texture map alone gives what you want.

Same situation with the MixRGB node from 3.3

> Hi, thanks for the report. Please share .blend file with steps to redo the issue. I tried doing one more thing I haven't tried last night before I was gonna send the blend file. It seems like there is something wrong with the mix node. Using the alpha texture map with the mix node actually breaks the alpha opacity, completely keeping the alpha value on the mesh on an integer strength. Not sure why that happens. Using the alpha texture map alone gives what you want. Same situation with the MixRGB node from 3.3 ![Screenshot_1.png](/attachments/b2ab9beb-49bb-47ac-80db-44bee00995bf) ![Screenshot_3.png](/attachments/34595366-2c06-449e-aba1-0b4074115ae1) ![Screenshot_2.png](/attachments/dbe3eeb5-38c4-45bc-b48b-c9596d416ecc)

Screenshot_2.png

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Screenshot_1.png

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Screenshot_3.png

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Anoca commented

2023-03-13 13:23:27 +01:00

alright, I think I have actually found a solution to the problem.

Instead of using the mix node, you can get good results using the Mix Shader.

looks like I'll be working like this until the mix node will get fixed.

Lemme know if there's a better solution.

alright, I think I have actually found a solution to the problem. Instead of using the mix node, you can get good results using the Mix Shader. ![Screenshot_2.png](/attachments/9f956994-77e9-4af5-a3e9-146edcadda14) looks like I'll be working like this until the mix node will get fixed. Lemme know if there's a better solution.

Screenshot_2.png

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Anoca commented

2023-03-14 10:19:09 +01:00

Ok, this is final. Its not the mix node, never it was.
its actually the alpha channel not giving proper results.
So instead of using the alpha channel, it would be best to use the Color channel instead.

Ok, this is final. Its not the mix node, never it was. its actually the alpha channel not giving proper results. So instead of using the alpha channel, it would be best to use the Color channel instead.

Pratik Borhade added

Status

Needs Triage

and removed

Status

Needs Information from User

labels 2023-03-14 16:45:39 +01:00

Germano Cavalcante commented

2023-03-14 19:54:43 +01:00

Thanks for the report, but the description and comments are still not clear on what the are exact steps for others to reproduce the bug.

Note that the codec (jpeg, png, exr) may be involved in the quality change, and this is not necessarily a bug.

This report does not contain all the requested information, which is required for us to investigate the issue.

Please submit a new report and carefully follow the instructions. Be sure to provide a .blend file with exact steps to reproduce the problem.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Thanks for the report, but the description and comments are still not clear on what the are **exact steps for others to reproduce the bug**. Note that the codec (jpeg, png, exr) may be involved in the quality change, and this is not necessarily a bug. --- This report does not contain all the requested information, which is required for us to investigate the issue. Please submit a new report and carefully follow the instructions. Be sure to provide a .blend file with exact steps to reproduce the problem. A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Germano Cavalcante closed this issue

2023-03-14 19:54:44 +01:00

Blender Bot added

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labels 2023-03-14 19:54:46 +01:00

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