Activating Adaptive Subdivision should automatically default to a Render subdivision setting of 0 to speed up render times and reduce memory usage #102451

New Issue

Joe Williamsen · 2022-11-12T03:00:01+01:00

Joe Williamsen commented

2022-11-12 03:00:01 +01:00

System Information
Operating system: Windows-10-10.0.19044-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 522.30

Blender Version
Broken: version: 3.3.2 Release Candidate, branch: master, commit date: 2022-11-09 08:41, hash: 19202736d5
Worked:?

Short description of error
Render times and memory skyrocket when using Adaptive Subdivision if "Render" levels set higher than "0" beforeturning on Adaptive Subdivision

Exact steps for others to reproduce the error
This may be a workflow issue more than a bug, however, I think the default should be that switching on Adaptive Subdivision should set the "Render" levels to "0" automatically. Basically, I was helping a friend troubleshoot long Adaptive Subdivision tessellation times and crazy memory use - and realized that having a value other than 0 in the Render levels slot before turning on Adaptive Subdivision was what was killing those render (tessellation) times.

To reproduce:
Open the attached .blend
Select the Sphere and activate Cycles viewport rendering
Go to the modifier stack and set the "Render" subdivisions to 0
Activate Adaptive Subdivision
Hit F12 to render
In the Render Results note the time and memory usage
Go back to the modifier stack and un-check Adaptive Subdivision
Change the Render levels in the Subdivision modifier to something like 5
Turn Adaptive Subdivision back on
Hit F12 to render
Note the longer tessellation time and memory use (with no visual quality difference)

Adaptive Bug.zip

**System Information** Operating system: Windows-10-10.0.19044-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 522.30 **Blender Version** Broken: version: 3.3.2 Release Candidate, branch: master, commit date: 2022-11-09 08:41, hash: `19202736d5` Worked:? **Short description of error** Render times and memory skyrocket when using Adaptive Subdivision if "Render" levels set higher than "0" *before*turning on Adaptive Subdivision **Exact steps for others to reproduce the error** This may be a workflow issue more than a bug, however, I think the default should be that switching on Adaptive Subdivision should set the "Render" levels to "0" automatically. Basically, I was helping a friend troubleshoot long Adaptive Subdivision tessellation times and crazy memory use - and realized that having a value other than 0 in the Render levels slot *before* turning on Adaptive Subdivision was what was killing those render (tessellation) times. To reproduce: Open the attached .blend Select the Sphere and activate Cycles viewport rendering Go to the modifier stack and set the "Render" subdivisions to 0 Activate Adaptive Subdivision Hit F12 to render In the Render Results note the time and memory usage Go back to the modifier stack and un-check Adaptive Subdivision Change the Render levels in the Subdivision modifier to something like 5 Turn Adaptive Subdivision back on Hit F12 to render Note the longer tessellation time and memory use (with no visual quality difference) [Adaptive Bug.zip](https://archive.blender.org/developer/F13893675/Adaptive_Bug.zip)

Joe Williamsen commented

2022-11-12 03:00:01 +01:00

Added subscriber: @Joe_W