Workbench Transparent Film Alpha Bug #65914

New Issue

Atomic · 2019-06-18T22:30:28+02:00

Atomic commented

2019-06-18 22:30:28 +02:00

System Information
Operating system: Window 7 SP1
Graphics card: nVidia 660 GTX

Blender Version
version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-09 21:43, hash: 030c7df19d, type: Release
build date: 09/06/2019, 17:18

Short description of error
Alpha of rendered transparent workbench image is wrong.

Exact steps for others to reproduce the error
Open the default scene and look through the camera. Change the render engine to "Workbench" and activate the Transparent flag under the Film rollout.
Render the scene, inspect the pixels and you will discover that the alpha of the pixels of the cube are not entirely solid, as they should be.

**System Information** Operating system: Window 7 SP1 Graphics card: nVidia 660 GTX **Blender Version** version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-09 21:43, hash: 030c7df19da9, type: Release build date: 09/06/2019, 17:18 **Short description of error** Alpha of rendered transparent workbench image is wrong. **Exact steps for others to reproduce the error** Open the default scene and look through the camera. Change the render engine to "Workbench" and activate the Transparent flag under the Film rollout. Render the scene, inspect the pixels and you will discover that the alpha of the pixels of the cube are not entirely solid, as they should be.

Atomic commented

2019-06-18 22:30:28 +02:00

Added subscriber: @AtomP

Jeroen Bakker self-assigned this 2019-06-19 09:39:10 +02:00

Jeroen Bakker commented

2019-06-19 09:55:50 +02:00

Ok, during rendering the AA-buffers are incorrect. Changing AA quality will change the Alpha value to use. Note that Single pass AA and No AA will make the Alpha completely 0.0

Edu Garcia commented

2019-06-19 11:14:05 +02:00

Added subscriber: @arcnor

Edu Garcia commented

2019-06-19 11:19:39 +02:00

@Jeroen-Bakker Thanks for looking into this (I was the person that posted about it on Blender Artists).

Unfortunately, with your suggested workaround (and with a more complex scene) I get either a completely transparent scene, or only the outlines if I enable them. (Using Blender 2.8 from yesterday on MacOS).

@Jeroen-Bakker Thanks for looking into this (I was the person that posted about it on Blender Artists). Unfortunately, with your suggested workaround (and with a more complex scene) I get either a completely transparent scene, or only the outlines if I enable them. (Using Blender 2.8 from yesterday on MacOS).

Edu Garcia commented

2019-06-19 11:29:18 +02:00

After some testing, the only "workaround" I can find is bumping AA samples to 32, which makes the Alpha 96.5% instead of 87.5% when using 8 samples. Still not really usable, but I'll work like this for now.

Jeroen Bakker commented

2019-06-19 16:08:57 +02:00

The work around is to use viewport rendering. This does not have these artifacts. Only final rendering is not working.

I bisecting the issue are found that ede4f31969 initiated the error. Will investigate to find out what works for both cases (hair rendering + transparency)

The work around is to use viewport rendering. This does not have these artifacts. Only final rendering is not working. I bisecting the issue are found that ede4f31969 initiated the error. Will investigate to find out what works for both cases (hair rendering + transparency)

blender-admin commented

2019-06-19 16:20:02 +02:00

This issue was referenced by ab60fe2a12

This issue was referenced by ab60fe2a12ae5d6a53abf754855be6d63bf1a08c

Jeroen Bakker commented

2019-06-19 16:24:16 +02:00

Changed status from 'Open' to: 'Resolved'

Jeroen Bakker closed this issue

2019-06-19 16:24:16 +02:00

Edu Garcia commented

2019-06-19 16:54:46 +02:00

Thanks @Jeroen-Bakker !