Improve performance of "Smart UV Project" #76532

New Issue

Campbell Barton · 2020-05-08T05:20:47+02:00

Campbell Barton commented

2020-05-08 05:20:47 +02:00

Currently smart uv projection is written in Python which has poor performance for multi-million polygon meshes (see #76527 (Smart UV Project)).

Note that a direct port of this to C may still have performance issues, it may be necessary to re-consider the exact method used, however that doesn't have to be part of the initial version.

Currently smart uv projection is written in Python which has poor performance for multi-million polygon meshes (see #76527 (Smart UV Project)). Note that a direct port of this to C may still have performance issues, it may be necessary to re-consider the exact method used, however that doesn't have to be part of the initial version.

Campbell Barton commented

2020-05-08 05:20:47 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Campbell Barton commented

2020-05-08 05:20:47 +02:00

Added subscriber: @ideasman42

Campbell Barton changed title from ~~Rewrite "Smart UV Project" in C~~ to Improve performance of "Smart UV Project"

2020-05-08 05:23:16 +02:00

Kevin Tan commented

2020-05-08 19:23:03 +02:00

Added subscriber: @Jmantastic

Kevin Tan commented

2020-05-08 19:23:03 +02:00

Do you recommend other ways to handle large uv mapping tasks with little manual work? In cases like lidar scans I definitely wouldn't be going for best quality, but just something to get the task done in a decent amount of time.

Chris Kohl commented

2020-05-09 09:53:32 +02:00

Added subscriber: @ckohl_art

Habib Gahbiche commented

2020-05-09 11:50:44 +02:00

Added subscriber: @zazizizou

Andreas Terrius commented

2020-07-05 15:54:55 +02:00

Added subscriber: @alether

Andreas Terrius commented

2020-07-05 15:54:55 +02:00

I will try doing this as my first issue, seems like a good way to familiarize myself with blender's C codebase. My plan is to port it straight to C and use the appropriate data structure to try and speed the process up.

I'll give an update in a couple of days on the progress.

I will try doing this as my first issue, seems like a good way to familiarize myself with blender's C codebase. My plan is to port it straight to C and use the appropriate data structure to try and speed the process up. I'll give an update in a couple of days on the progress.

Andreas Terrius commented

2020-07-07 13:58:57 +02:00

Do we have any example of using 2d dynamic arrays using blender's BLI data structure libraries ?

I need it in order to port getUvIslands and packIslands

Do we have any example of using 2d dynamic arrays using blender's BLI data structure libraries ? I need it in order to port getUvIslands and packIslands

Daniel Calderón commented

2020-07-10 18:27:51 +02:00

Added subscriber: @xdanic

Daniel Calderón commented

2020-07-10 18:27:51 +02:00

Meshroom uses different algorithms for UVing and it's open source. Maybe we could port those methods.

Andreas Terrius commented

2020-07-13 14:56:03 +02:00

I think I managed to port most of the existing python algorithm to C. Just need to find a way to use existing functions to pack the UV islands and try out some edge cases.

I'll open up a diff once it's done

I think I managed to port most of the existing python algorithm to C. Just need to find a way to use existing functions to pack the UV islands and try out some edge cases. I'll open up a diff once it's done

Andreas Terrius commented

2020-07-16 15:27:37 +02:00

Here is the diff,
https://developer.blender.org/D8311

I'm still retaining the old operator in case someone wants to do an arc patch and compare. If you find any bugs or edge cases feel free to notify me

Here is the diff, https://developer.blender.org/D8311 I'm still retaining the old operator in case someone wants to do an arc patch and compare. If you find any bugs or edge cases feel free to notify me

Campbell Barton commented

2020-07-26 13:41:46 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-07-26 13:41:46 +02:00

Campbell Barton self-assigned this 2020-07-26 13:41:46 +02:00

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Improve performance of "Smart UV Project" #76532