Adding empty mesh cache modifier to a mesh degrades playback performance significantly even if modifier display disabled #66667

New Issue

Ludvik Koutny · 2019-07-10T15:37:49+02:00

Ludvik Koutny commented

2019-07-10 15:37:49 +02:00

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.64

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-08 23:33, hash: ac8c795429
Worked: (optional)

Short description of error
When empty mesh cache modifier without any mesh cache is applied onto a high poly mesh (Around 400k triangles) the playback and timeline scrubbing performance is significantly affected despite no file even being loaded yet. On top of that, performance is not recovered even when modifier display is disabled.

Exact steps for others to reproduce the error

In an empty new blender file, subdivide the default cube a few times so it has over 400k triangles
In the modifier list, apply the Mesh Cache modifier
Notice the slow animation playback and laggy timeline scrubbing
Disable the viewport display of the Mesh Cache modifier by clicking the display icon in modifier list
Notice the performace loss still persists

Result: Mesh Cache modifier slows down playback performance even without any file loaded, and disabling the modifier display does not help to recover performance
Expected: Mesh Cache modifier does not affect playback performance until mesh cache is loaded and displayed. When Mesh Cache modifier display is disabled, the modifier no longer impacts performance.

**System Information** Operating system: Windows-10-10.0.17763 64 Bits Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 430.64 **Blender Version** Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-08 23:33, hash: `ac8c795429` Worked: (optional) **Short description of error** When empty mesh cache modifier without any mesh cache is applied onto a high poly mesh (Around 400k triangles) the playback and timeline scrubbing performance is significantly affected despite no file even being loaded yet. On top of that, performance is not recovered even when modifier display is disabled. **Exact steps for others to reproduce the error** 1. In an empty new blender file, subdivide the default cube a few times so it has over 400k triangles 2. In the modifier list, apply the Mesh Cache modifier 3. Notice the slow animation playback and laggy timeline scrubbing 4. Disable the viewport display of the Mesh Cache modifier by clicking the display icon in modifier list 5. Notice the performace loss still persists Result: Mesh Cache modifier slows down playback performance even without any file loaded, and disabling the modifier display does not help to recover performance Expected: Mesh Cache modifier does not affect playback performance until mesh cache is loaded and displayed. When Mesh Cache modifier display is disabled, the modifier no longer impacts performance.

Ludvik Koutny commented

2019-07-10 15:37:49 +02:00

Added subscriber: @Rawalanche

Sybren A. Stüvel self-assigned this 2019-07-11 12:23:47 +02:00

Sybren A. Stüvel commented

2019-08-02 12:40:06 +02:00

Please see the discussion at D5228. Currently we see this as a specific corner case that's unlikely to happen (not many people will have an enabled but empty Mesh Cache modifier) and has a workaround (disable the modifier).

Please see the discussion at [D5228](https://archive.blender.org/developer/D5228). Currently we see this as a specific corner case that's unlikely to happen (not many people will have an enabled but empty Mesh Cache modifier) and has a workaround (disable the modifier).

Ludvik Koutny commented

2019-08-02 13:57:50 +02:00

In #66667#743306, @dr.sybren wrote:
Please see the discussion at D5228. Currently we see this as a specific corner case that's unlikely to happen (not many people will have an enabled but empty Mesh Cache modifier) and has a workaround (disable the modifier).

No it does not. It's specifically written in the report, one line above the last one. Disabling the modifier does not recover the performance.

> In #66667#743306, @dr.sybren wrote: > Please see the discussion at [D5228](https://archive.blender.org/developer/D5228). Currently we see this as a specific corner case that's unlikely to happen (not many people will have an enabled but empty Mesh Cache modifier) and has a workaround (disable the modifier). No it does not. It's specifically written in the report, one line above the last one. Disabling the modifier does not recover the performance.

Sybren A. Stüvel commented

2019-08-09 11:28:04 +02:00

I misread, sorry. Still, from D5228 it seems that this is currently by design (even when a bit cumbersome).

I misread, sorry. Still, from [D5228](https://archive.blender.org/developer/D5228) it seems that this is currently by design (even when a bit cumbersome).

Sybren A. Stüvel commented

2019-09-19 17:41:38 +02:00

Changed status from 'Open' to: 'Archived'

Sybren A. Stüvel closed this issue

2019-09-19 17:41:38 +02:00

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Adding empty mesh cache modifier to a mesh degrades playback performance significantly even if modifier display disabled #66667