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EEVEE: Mixed SSS shader's visual effect is getting less and less.
Closed, InvalidPublic

Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1050 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 417.35

Blender Version
Broken: version: 2.80 (sub 60), branch: master, commit date: 2019-05-09 10:46, hash: rBf877022956df
Worked: version: 2.80 (sub 59), branch: blender2.7, commit date: 2019-04-24 22:25, hash: rBd966c2f0c2ad

Short description of error
With EEVEE, if SSS shaders mixed, subsurface scattering visual effect is getting less and less.

Exact steps for others to reproduce the error
T64158 : "Mixed EEVEE SSS shader becomes brighter and brighter." is fixed. Thank you.
https://developer.blender.org/T64158
https://developer.blender.org/rB1a99b6fc7e8e2d670bc5ceed23ecc84020a10555

But now, if SSS shaders are mixed, subsurface scattering visual effect is getting less and less.

Please try attatched .blend file.

And change 3D view display "Renderd". (Display "LookDev", It is difficult to discern the difference)

With version: 2.80 (sub 60), commit date: 2019-05-09 10:46, hash: rBf877022956df,
Mixed SSS shader looks different from original.

With old build version: 2.80 (sub 59), commit date: 2019-04-24 22:25, hash: rBd966c2f0c2ad,
Mixed SSS looks the same as original. This is the expected result.

For your reference, version: 2.80 (sub 60), commit date: 2019-05-07 19:17, hash: rB3dc9da3a74ee
looks like this.

Details

Type
Bug

Event Timeline

Yes. And mix two SSS node and set "Factor = 0", then result is invalid.

Blender 2.80 Beta 2019-05-09 17:55
Windows 7 SP1 64-bit
Geforce GTX 670

I added two same SSS node and mix them.

Mix Fac = 0

Mix Fac = 1

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.

Only one Subsurface BSSDF node per material can produce ScreenSpace SubSuface. Pretty much like screen space reflections. Chosen SSS node is arbitrarily determined for now.

This is a limitation but I just saw that it is not listed as such in the manual.