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Weird transparency bug Alpha Blend [EEVEE]
Open, Waiting for Developer to ReproducePublic

Description

System Information
Operating system: Darwin-18.6.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 560 OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.9.26

Blender Version
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-11 21:45, hash: rBd93a7290e506
Worked: (optional)

Short description of error
I have an object that is emissive, and is set to Alpha Blend, because it has a gradient that fades to transparent.
It won't show the results, neither in viewport and rendered, only if I add an unconnected Diffuse or Principled BSDF.
Sometime it works even when disconnected multiple times from the material output.

But on a fresh start it won't work when set to Alpha Blend, and an unconnected diffuse or principled bsdf needs to be added in order to update the object with the material.

Details

Type
Bug

Event Timeline

Sebastian Parborg (zeddb) lowered the priority of this task from Needs Triage by Developer to Needs Information from User.Jun 17 2019, 4:00 PM

Can you attach an example file?

Sorry for the late reply
Here is a video as well
https://www.youtube.com/watch?v=wzMoorkw_FM

It seems to work for me with that file. Does this still happen for you with the latest beta?

Yes, I switched to Windows on my mac to see if maybe the OS has anything to do with this, downloaded the latest beta, it doesn't work.
This is weird...

Are you using the latest drivers on windows?

Yes, I keep everything up to date, both on mac OS and Windows 10.
I'm on a Macbook pro

Sebastian Parborg (zeddb) raised the priority of this task from Needs Information from User to Waiting for Developer to Reproduce.Jul 1 2019, 10:53 AM

@Jeroen Bakker (jbakker) can you reproduce this with the proprietary drivers?

Just in case, I was able to reproduce this on my Windows 7 and AMD HD7700 (doesn’t work until you add Principled or Diffuse shader even if it’s not connected to anything) but on my Windows 8 and NVidia 750 everything worked right away.
EDIT - did another try on latest 4a5e046c923f from 2019-07-16 and it seems to be working even on my AMD 7700 right away as well. Earlier build still doesn't work so it looks like something was fixed in that area.