Multiscatter GGX artefacts for rough glass #85259
Labels
No Label
Interest
Alembic
Interest
Animation & Rigging
Interest
Asset Browser
Interest
Asset Browser Project Overview
Interest
Audio
Interest
Automated Testing
Interest
Blender Asset Bundle
Interest
BlendFile
Interest
Collada
Interest
Compatibility
Interest
Compositing
Interest
Core
Interest
Cycles
Interest
Dependency Graph
Interest
Development Management
Interest
EEVEE
Interest
EEVEE & Viewport
Interest
Freestyle
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
ID Management
Interest
Images & Movies
Interest
Import Export
Interest
Line Art
Interest
Masking
Interest
Metal
Interest
Modeling
Interest
Modifiers
Interest
Motion Tracking
Interest
Nodes & Physics
Interest
OpenGL
Interest
Overlay
Interest
Overrides
Interest
Performance
Interest
Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds & Tests
Interest
Python API
Interest
Render & Cycles
Interest
Render Pipeline
Interest
Sculpt, Paint & Texture
Interest
Text Editor
Interest
Translations
Interest
Triaging
Interest
Undo
Interest
USD
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Interest
Video Sequencer
Interest
Virtual Reality
Interest
Vulkan
Interest
Wayland
Interest
Workbench
Interest: X11
Legacy
Blender 2.8 Project
Legacy
Milestone 1: Basic, Local Asset Browser
Legacy
OpenGL Error
Meta
Good First Issue
Meta
Papercut
Meta
Retrospective
Meta
Security
Module
Animation & Rigging
Module
Core
Module
Development Management
Module
EEVEE & Viewport
Module
Grease Pencil
Module
Modeling
Module
Nodes & Physics
Module
Pipeline, Assets & IO
Module
Platforms, Builds & Tests
Module
Python API
Module
Render & Cycles
Module
Sculpt, Paint & Texture
Module
Triaging
Module
User Interface
Module
VFX & Video
Platform
FreeBSD
Platform
Linux
Platform
macOS
Platform
Windows
Priority
High
Priority
Low
Priority
Normal
Priority
Unbreak Now!
Status
Archived
Status
Confirmed
Status
Duplicate
Status
Needs Info from Developers
Status
Needs Information from User
Status
Needs Triage
Status
Resolved
Type
Bug
Type
Design
Type
Known Issue
Type
Patch
Type
Report
Type
To Do
No Milestone
No project
No Assignees
4 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#85259
Loading…
Reference in New Issue
No description provided.
Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.30
Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-01-29 16:35, hash:
d0f59d3842
Worked: (newest version of Blender that worked as expected)
It's been a long time this artefact hasn't been solved.
When you set a Glass BSDF or Principled BSDF distribution type to Multiscatter GGX, and roughness value higher than 0.2, you will get the artefact from almost every camera angle. It's easiest to see this glitch to observe the model in orthographic view.
And with roughness set to not 0, the whole reflection and refraction seems to have a anistropic-like affect.
This is a preview screenshot.
Here is a render result of 2000 samples without any noise reduction.
I have to use multiscatter ggx cause other distribution function just break energy preservation when shading forested glasses and make the glass itself dark.
test blend file here test.blend
Added subscriber: @baoyu
For comparison, this is the result with distribution function been set to GGX and other parameters remain the same.
Added subscriber: @brecht
@brecht please show some love ; )
Added subscribers: @LukasStockner, @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
This looks indeed off.
Not familiar enough with that code to classify though, maybe @LukasStockner would know?
Thanks @lichtwerk
Added subscriber: @BeirayZHA
This comment was removed by @BeirayZHA
Is there a chance that we have this issue solved in the Cycles X project?
Added subscriber: @Fernando-Alcala
Here's another MGGX roughness related bug #92520
I can confirm this is solved, as the old mggx shading model code had been removed and replaced with a new approximated method.