Render looks differently in preview and render #73163
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
5 Participants
Notifications
Due Date
No due date set.
Dependencies
No dependencies set.
Reference: blender/blender#73163
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: Linux-4.15.0-72-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 435.21
Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-01-14 23:08, hash:
3edd8d5b07Short description of error
Render looks differently in preview and render, that makes unpredictable results on render
Exact steps for others to reproduce the error
triangulation issue.blend
Note, that tiny line appears on surface of the model. So render has unpredictable artifacts, that are not shown in preview.
Notes
If model was triangulated manually (X -> Limited dissolve, then Ctrl+T), artifacts do not appear.
Model generated by converting curve to mesh.
Added subscriber: @crantisz
Added subscribers: @brecht, @EAW
I can confirm.
Rendering out a normal pass, the value of the Blue Channel changes from 0.00000 to -0.00000 on that line.
Here is the result of separating the channels in the compositor and running the normal layer's blue channel through a math node set to
Less Than0.00@brecht So I am guessing this is a precision issue where
F12render uses a different precision thanViewport Shading: Rendered?I am not sure if this is a known limitation or a bug so I will leave it up to a developer with more knowledge in this area.
Triaging Note: When using the
Map Rangenode, the defaultFrom MinandTo Minvalues are 0.00. Using the right then left arrow keys with the the values are as follows: 0.00 -> 0.100 -> -3.72529e-09It doesn't go back to 0.00 as I expected it to do. Included in case this is helpful information for possibly solving this issue.
I then took a closer look at the model and saw that there are 4 faces that make up that line.
I had missed this before as the
wireframeoverlay setting was 0.5Merging those faces
Fixes the issue of the line appearing in the render
It does so by setting the normal layer B channel to -0.00000
triangulation issue1.blend
System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 470/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.13
Blender Version
Broken: version: 2.83 (sub 0), branch: master, commit date: 2020-01-15 06:16, hash:
6c0eeb1569Triangulation works differently in preview and renderto Render looks differently in preview and renderAdded subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Can also confirm, thise very thin triangle(s) somewhat behave differently.
This is likely a raytracing precision issue, maybe a difference between the dynamic viewport BVH and static BVH for final render. In general long thin triangles can be problematic.
There is some work underway to improve issues like this, see D6250: Fix #43835, #54284: Cycles with no ray offsetting. More a known issue than a bug.
Added subscriber: @ThomasDinges
Changed status from 'Confirmed' to: 'Resolved'
Cannot confirm this anymore with Blender 3.4, but was likely fixed in 3.2 already, see https://wiki.blender.org/wiki/Reference/Release_Notes/3.1/Cycles#Ray_Tracing_Precision