Page MenuHome
Create Task
Maniphest T82500

GGX Multiscatter energy Loss at low roughness
Confirmed, NormalPublicBUG
Actions

Description

System Information
Operating system: Windows 10 64bits
Graphics card: Nvidia geforce 2080Ti FE

Blender Version
Broken:
2.90.1
2.90
2.79b (2018-03-22)
Worked: No found

Short description of error
Hello,
MutltiScatter GGX is broken for roughness values between 0 and 12.5%, GGX work fine, see the pictures:
MutltiScatterGGX

MutltiScatter GGX WaveForm

GGX


GGX WaveForm

Thanks for your patience.

Exact steps for others to reproduce the error
Load MultiScatterGGXTest

MultiScatterGGXTest.blend777 KBDownload

Render

Related Objects

Event Timeline

Rousseau (Kalrua) created this task.Nov 8 2020, 1:47 AM
Rousseau (Kalrua) added a comment.Nov 10 2020, 1:46 PM

the MultiScatter anisotropic node works without bugs, so it is specific to the glossy node.

Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Nov 10 2020, 10:16 PM
Richard Antalik (ISS) added a project: Render & Cycles.
Rousseau (Kalrua) added a comment.EditedDec 3 2020, 3:29 PM

Update: MultiScatter anisotropic is also broken.

Brecht Van Lommel (brecht) changed the subtype of this task from "Report" to "Bug".Jan 18 2021, 12:36 PM
Rousseau (Kalrua) mentioned this in T88595: GGX returns more energy than received when GGX multiscattered is present in a scene (potential massive firefly).May 26 2021, 4:15 PM
Brecht Van Lommel (brecht) merged a task: T88595: GGX returns more energy than received when GGX multiscattered is present in a scene (potential massive firefly).Jul 12 2021, 6:08 PM
Brecht Van Lommel (brecht) added subscribers: Germano Cavalcante (mano-wii), Pratik Borhade (PratikPB2123).
Rousseau (Kalrua) mentioned this in T92520: Multiscatter GGX is bugged.Dec 7 2021, 8:27 PM
baoyu (baoyu) added a subscriber: baoyu (baoyu).Dec 27 2021, 8:08 AM
Alaska (Alaska) merged a task: T96602: Multiscatter GGX Glass Shader - In a certain range of roughnesses, specular reflections darken/disappear..Mar 22 2022, 4:41 AM
Alaska (Alaska) added subscribers: tempdevnova (tempdevnova), Alaska (Alaska).
Alaska (Alaska) merged a task: T96603: Multiscatter GGX Glass Shader - Roughness has no effect until 0.05.Mar 22 2022, 4:44 AM
Alaska (Alaska) mentioned this in T96603: Multiscatter GGX Glass Shader - Roughness has no effect until 0.05.Mar 22 2022, 4:49 AM
Alaska (Alaska) mentioned this in T96602: Multiscatter GGX Glass Shader - In a certain range of roughnesses, specular reflections darken/disappear..
Alaska (Alaska) mentioned this in T96604: Multiscatter GGX Glass and Principled BSDF shows a seam in rendering that shouldn't be there.
Alaska (Alaska) mentioned this in T96606: Multiscatter GGX produces large difference in refraction brightness compared to GGX.Mar 22 2022, 5:56 AM