blender/blender-addons
19
43
Fork 96
Code Issues 628 Pull Requests 27 Projects 1 Releases Wiki Activity

Export to .ply ignores flat shading #102472

New Issue
Open
opened 2022-11-13 08:21:44 +01:00 by Василий · 7 comments
Василий commented 2022-11-13 08:21:44 +01:00
Copy Link

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 31.0.101.2111

Blender Version
Broken: version: 3.3.1, branch: master, commit date: 2022-10-04 18:35, hash: blender/blender@b292cfe5a9
Worked: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 'blender/blender@02948a2cab'

Short description of error
When exporting to Stanford format (.ply), regardless of whether the model is smooth shading or flat shading, the normal information always corresponds to smooth shading. Even for a simple cube.
On my laptop everything works correctly (Version 2.92.0)

Exact steps for others to reproduce the error

  1. open the attached "cube.blend" file cube.blend
  2. File - Export - Stanford.ply
  3. Format ASCII - set; Selection only - not set; Transform: Z forward, Y up, Scale 1.00; Geometry: Apply modifiers - not set, Normals - set, UVs - set, Vertex Colors - not set image.png
  4. Press EXPORT PLY button
  5. All normals in the cube.ply are calculated for the smooth shading model cube.ply
**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: Intel(R) UHD Graphics 630 Intel 4.5.0 - Build 31.0.101.2111 **Blender Version** Broken: version: 3.3.1, branch: master, commit date: 2022-10-04 18:35, hash: `blender/blender@b292cfe5a9` Worked: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: 'blender/blender@02948a2cab' **Short description of error** When exporting to Stanford format (.ply), regardless of whether the model is smooth shading or flat shading, the normal information always corresponds to smooth shading. Even for a simple cube. On my laptop everything works correctly (Version 2.92.0) **Exact steps for others to reproduce the error** 1. open the attached "cube.blend" file [cube.blend](https://archive.blender.org/developer/F13899514/cube.blend) 2. File - Export - Stanford.ply 3. Format ASCII - set; Selection only - not set; Transform: Z forward, Y up, Scale 1.00; Geometry: Apply modifiers - not set, Normals - set, UVs - set, Vertex Colors - not set ![image.png](https://archive.blender.org/developer/F13899523/image.png) 4. Press EXPORT PLY button 5. All normals in the cube.ply are calculated for the smooth shading model [cube.ply](https://archive.blender.org/developer/F13899520/cube.ply)
Василий commented 2022-11-13 08:21:44 +01:00
Author
Copy Link

Added subscriber: @smitch80

Added subscriber: @smitch80
Василий commented 2022-11-13 09:24:19 +01:00
Author
Copy Link

I found a quick workaround for my problem for now
I replaced files in the C:\Program Files\Blender Foundation\Blender 3.3\3.3\scripts\addons\io_mesh_ply folder with the same files but older version (2.92.0)
Those files are: init.py, export_ply.py and import_ply.py
That worked well for me

I found a quick workaround for my problem for now I replaced files in the C:\Program Files\Blender Foundation\Blender 3.3\3.3\scripts\addons\io_mesh_ply folder with the same files but older version (2.92.0) Those files are: __init__.py, export_ply.py and import_ply.py That worked well for me
Omar Emara commented 2022-11-21 13:09:50 +01:00
Member
Copy Link

Added subscriber: @OmarEmaraDev

Added subscriber: @OmarEmaraDev
Omar Emara commented 2022-11-21 13:09:50 +01:00
Member
Copy Link

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Omar Emara commented 2022-11-21 13:09:50 +01:00
Member
Copy Link

New:

1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.375000 0.000000
1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.625000 0.000000
1.000000 1.000000 1.000000 0.577350 0.577350 0.577350 0.625000 0.250000
1.000000 -1.000000 1.000000 0.577350 -0.577350 0.577350 0.375000 0.250000
-1.000000 1.000000 1.000000 -0.577350 0.577350 0.577350 0.625000 0.500000
-1.000000 -1.000000 1.000000 -0.577350 -0.577350 0.577350 0.375000 0.500000
-1.000000 1.000000 -1.000000 -0.577350 0.577350 -0.577350 0.625000 0.750000
-1.000000 -1.000000 -1.000000 -0.577350 -0.577350 -0.577350 0.375000 0.750000
1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.625000 1.000000
1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.375000 1.000000
1.000000 -1.000000 1.000000 0.577350 -0.577350 0.577350 0.125000 0.500000
1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.125000 0.750000
1.000000 1.000000 1.000000 0.577350 0.577350 0.577350 0.875000 0.500000
1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.875000 0.750000
4 0 1 2 3
4 3 2 4 5
4 5 4 6 7
4 7 6 8 9
4 10 5 7 11
4 4 12 13 6

Old:

-1.000000 -1.000000 -1.000000 -1.000000 -0.000000 0.000000 0.375000 0.000000
-1.000000 -1.000000 1.000000 -1.000000 -0.000000 0.000000 0.625000 0.000000
-1.000000 1.000000 1.000000 -1.000000 -0.000000 0.000000 0.625000 0.250000
-1.000000 1.000000 -1.000000 -1.000000 -0.000000 0.000000 0.375000 0.250000
-1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.375000 0.250000
-1.000000 1.000000 1.000000 0.000000 1.000000 0.000000 0.625000 0.250000
1.000000 1.000000 1.000000 0.000000 1.000000 0.000000 0.625000 0.500000
1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.375000 0.500000
1.000000 1.000000 -1.000000 1.000000 -0.000000 0.000000 0.375000 0.500000
1.000000 1.000000 1.000000 1.000000 -0.000000 0.000000 0.625000 0.500000
1.000000 -1.000000 1.000000 1.000000 -0.000000 0.000000 0.625000 0.750000
1.000000 -1.000000 -1.000000 1.000000 -0.000000 0.000000 0.375000 0.750000
1.000000 -1.000000 -1.000000 0.000000 -1.000000 0.000000 0.375000 0.750000
1.000000 -1.000000 1.000000 0.000000 -1.000000 0.000000 0.625000 0.750000
-1.000000 -1.000000 1.000000 0.000000 -1.000000 0.000000 0.625000 1.000000
-1.000000 -1.000000 -1.000000 0.000000 -1.000000 0.000000 0.375000 1.000000
-1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.125000 0.500000
1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.375000 0.500000
1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.375000 0.750000
-1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.125000 0.750000
1.000000 1.000000 1.000000 0.000000 -0.000000 1.000000 0.625000 0.500000
-1.000000 1.000000 1.000000 0.000000 -0.000000 1.000000 0.875000 0.500000
-1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000 0.875000 0.750000
1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000 0.625000 0.750000
4 0 1 2 3
4 4 5 6 7
4 8 9 10 11
4 12 13 14 15
4 16 17 18 19
4 20 21 22 23

It seems the new behavior produces less number of vertices and thus interpolates normals or something. Not sure if this is expected.

New: ``` 1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.375000 0.000000 1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.625000 0.000000 1.000000 1.000000 1.000000 0.577350 0.577350 0.577350 0.625000 0.250000 1.000000 -1.000000 1.000000 0.577350 -0.577350 0.577350 0.375000 0.250000 -1.000000 1.000000 1.000000 -0.577350 0.577350 0.577350 0.625000 0.500000 -1.000000 -1.000000 1.000000 -0.577350 -0.577350 0.577350 0.375000 0.500000 -1.000000 1.000000 -1.000000 -0.577350 0.577350 -0.577350 0.625000 0.750000 -1.000000 -1.000000 -1.000000 -0.577350 -0.577350 -0.577350 0.375000 0.750000 1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.625000 1.000000 1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.375000 1.000000 1.000000 -1.000000 1.000000 0.577350 -0.577350 0.577350 0.125000 0.500000 1.000000 -1.000000 -1.000000 0.577350 -0.577350 -0.577350 0.125000 0.750000 1.000000 1.000000 1.000000 0.577350 0.577350 0.577350 0.875000 0.500000 1.000000 1.000000 -1.000000 0.577350 0.577350 -0.577350 0.875000 0.750000 4 0 1 2 3 4 3 2 4 5 4 5 4 6 7 4 7 6 8 9 4 10 5 7 11 4 4 12 13 6 ``` Old: ``` -1.000000 -1.000000 -1.000000 -1.000000 -0.000000 0.000000 0.375000 0.000000 -1.000000 -1.000000 1.000000 -1.000000 -0.000000 0.000000 0.625000 0.000000 -1.000000 1.000000 1.000000 -1.000000 -0.000000 0.000000 0.625000 0.250000 -1.000000 1.000000 -1.000000 -1.000000 -0.000000 0.000000 0.375000 0.250000 -1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.375000 0.250000 -1.000000 1.000000 1.000000 0.000000 1.000000 0.000000 0.625000 0.250000 1.000000 1.000000 1.000000 0.000000 1.000000 0.000000 0.625000 0.500000 1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.375000 0.500000 1.000000 1.000000 -1.000000 1.000000 -0.000000 0.000000 0.375000 0.500000 1.000000 1.000000 1.000000 1.000000 -0.000000 0.000000 0.625000 0.500000 1.000000 -1.000000 1.000000 1.000000 -0.000000 0.000000 0.625000 0.750000 1.000000 -1.000000 -1.000000 1.000000 -0.000000 0.000000 0.375000 0.750000 1.000000 -1.000000 -1.000000 0.000000 -1.000000 0.000000 0.375000 0.750000 1.000000 -1.000000 1.000000 0.000000 -1.000000 0.000000 0.625000 0.750000 -1.000000 -1.000000 1.000000 0.000000 -1.000000 0.000000 0.625000 1.000000 -1.000000 -1.000000 -1.000000 0.000000 -1.000000 0.000000 0.375000 1.000000 -1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.125000 0.500000 1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.375000 0.500000 1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.375000 0.750000 -1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.125000 0.750000 1.000000 1.000000 1.000000 0.000000 -0.000000 1.000000 0.625000 0.500000 -1.000000 1.000000 1.000000 0.000000 -0.000000 1.000000 0.875000 0.500000 -1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000 0.875000 0.750000 1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000 0.625000 0.750000 4 0 1 2 3 4 4 5 6 7 4 8 9 10 11 4 12 13 14 15 4 16 17 18 19 4 20 21 22 23 ``` It seems the new behavior produces less number of vertices and thus interpolates normals or something. Not sure if this is expected.
Gary H commented 2023-01-29 18:52:25 +01:00
Copy Link

Added subscriber: @GaryH

Added subscriber: @GaryH
Gary H commented 2023-01-29 18:57:38 +01:00
Copy Link

Would love to see this fixed as well! Blender seems to completely ignore normal data when exporting a .ply file. The only way to retain a flat shading is to disable the normal option, however this hack does not allow a mixture of flat and smooth shaded faces, which is crucial to any normal usage of the exporter. Additionally, Blender seems to ignore the smooth-shaded normal too during import.

Would love to see this fixed as well! Blender seems to completely ignore normal data when exporting a `.ply` file. The only way to retain a flat shading is to disable the `normal` option, however this hack does not allow a mixture of flat and smooth shaded faces, which is crucial to any normal usage of the exporter. Additionally, Blender seems to ignore the smooth-shaded normal too during import.
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels   
Interest
Animation & Rigging

  
Interest
Blender Cloud

  
Interest
Collada

  
Interest
Core

  
Interest
Documentation

  
Interest
Eevee & Viewport

  
Interest
Geometry Nodes

  
Interest
Grease Pencil

  
Interest
Import and Export

  
Interest
Modeling

  
Interest
Modifiers

  
Interest
Nodes & Physics

  
Interest
Pipeline, Assets & IO

  
Interest
Platforms, Builds, Tests & Devices

  
Interest
Python API

  
Interest
Rendering & Cycles

  
Interest
Sculpt, Paint & Texture

  
Interest
Translations

  
Interest
User Interface

  
Interest
UV Editing

  
Interest
VFX & Video

  
Meta
Good First Issue

  
Meta
Papercut

  
Module
Add-ons (BF-Blender)

  
Module
Add-ons (Community)

  
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 Label
Interest
Animation & Rigging
Interest
Blender Cloud
Interest
Collada
Interest
Core
Interest
Documentation
Interest
Eevee & Viewport
Interest
Geometry Nodes
Interest
Grease Pencil
Interest
Import and Export
Interest
Modeling
Interest
Modifiers
Interest
Nodes & Physics
Interest
Pipeline, Assets & IO
Interest
Platforms, Builds, Tests & Devices
Interest
Python API
Interest
Rendering & Cycles
Interest
Sculpt, Paint & Texture
Interest
Translations
Interest
User Interface
Interest
UV Editing
Interest
VFX & Video
Meta
Good First Issue
Meta
Papercut
Module
Add-ons (BF-Blender)
Module
Add-ons (Community)
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
Milestone
Clear milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
No Assignees
3 Participants
Notifications
Due Date
The due date is invalid or out of range. Please use the format 'yyyy-mm-dd'.

No due date set.

Dependencies

No dependencies set.

Reference: blender/blender-addons#102472
No description provided.
Delete Branch "%!s()"

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?