Generative modifiers (solidify, mirror) draw face normals from original face (wrong direction) #77090
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
7 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#77090
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
@Baszczer information
Operating system: Ubuntu 20.04
Graphics card: Radeon Pro WX 7100
@Alaska information
Operating system: Linux-5.4.0-7629-generic-x86_64-with-debian-bullseye
Graphics card: GTX 1050Ti 440.82
Blender Version
Broken: 2.83 (2020-05-26 22:42)
f772a4b8fa
, 2.90 (2020-05-26 20:02)eb5422828a
Worked: 2.82a
Short description of error:
The viewpoint overlay for displaying faces normals in edit mode for faces that are part of a solidify modifier will always point in the direction of the face normal being solidified with Blender 2.83 and 2.90.
2.82a
2.83/2.90
Exact steps for others to reproduce the error:
#77090 - Solidify Normals.blend
In 2.82a, this will be have as expected. The normal lines will be perpendicular to the faces of the solidifies plane. In 2.83, all the normal lines align with the normal line of the face being solidified.
Video because I feel like I'm having a hard time explaining this in words:
2020-05-27 22-55-31.mp4
Added subscriber: @Baszczer
#94826 was marked as duplicate of this issue
Added subscriber: @Alaska
Changed status from 'Needs Triage' to: 'Confirmed'
I will update the description of the task with details on how to reproduce the issue.
Added subscriber: @fclem
Ok this was a design choice to avoid this bug present in 2.82:
Put simply we use the original face normal to avoid conflicting normals for multiple faces sharing the same original face (since there will only be 1 face dot/normal displayed).
So I would reconsider this as known issue.
Added subscriber: @ideasman42
Changed status from 'Confirmed' to: 'Archived'
If current behavior is intended, there is no reason to keep this open. Closing.
Added subscriber: @lichtwerk
Just noting that this also breaks the mirror modifier as noted in #94826 (Face Normals display as NOT mirrored when Mirror Modifier is used)
For the subd modifier, this might make sense, but solidify and mirror really suffer from this.
Which commit was that, {a2d19c1f78}?
Different face normals behaviour with solidify modifierto Generative modifiers (solidify, mirror) draw face normals from original face (wrong direction)Cant we be more distinct and only do this if we know they will be drawn in the same place?
Added subscriber: @AdamJanz
Changed status from 'Archived' to: 'Needs Developer To Reproduce'
@lichtwerk Thanks Philipp! Glad the devs are aware of this issue. I admit it's quite confusing to see inverted normals when modelling with the mirror modifier. A temporary workaround is to either turn off the "Cage" display on the modifier or enable "Face Orientation" in the Viewport Overlays so one can tell what normals are truly flipped.
A possible solution: would it be feasible to have the face normals draw on generated faces when "Cage" is enabled and only draw on original faces when "Cage" is disabled? This should also solve the original issue when a subsurf modifier is applied, with the added benefit of making more visual sense to the user (see images below):