Prusaslicer: Preview panel render corruption

[TimWilde]

Version

Version: 2.2.0+win64
Build: PrusaSlicer-2.2.0+win64-202003211145

Operating system type + version

Windows 10 Pro Version 2004, Build 19041.264

Operating System:    Windows
System Architecture: 64 bit
Windows Version:     Windows 10 (build 19041), 64-bit edition
Total RAM size [MB]: 17,067MB
OpenGL installation
GL version:   4.5.0 - Build 23.20.16.4849
Vendor:       Intel
Renderer:     Intel(R) UHD Graphics 620
GLSL version: 4.50 - Build 23.20.16.4849
Installed extensions:
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3D printer brand / version + firmware version (if known)

Original Prusa i3 Mk2, kit, stock.
Firmware v3.2.3

Behavior

Render bug.

Occasionally the print preview panel display is corrupted. Though this doesn't happen every time the slicer is used. May be related to repeated deleting then loading models, but this doesn't always reproduce so inconclusive, I'm afraid.

Moving the mouse cursor in or out of the preview pane toggles between corrupted or clear. Moving the layer up or down (mouse scrollwheel, or keyboard arrow keys) also toggles between a corrupted or clear view of the preview.

Project File (.3MF) where problem occurs

Not relevant to any particular project or model - happens on anything from complex projects produced with Fusion 360 to simple calibration cubes from Thingiverse.

[lukasmatena]

This is similar to #2629. Please, make sure you have enough GPU memory and up-to-date drivers. @enricoturri1966 might see and suggest more.

[enricoturri1966]

As @lukasmatena already pointed out, the first I would try is to update the graphic card driver, see: https://downloadcenter.intel.com/product/126789/Intel-UHD-Graphics-620

[TimWilde]

Thanks for the replies :)

I've checked in both Windows' Device Manager and the (daftly named) Intel "Graphics Command Center" and both report the drivers are up to date. As it's an integrated GPU I checked the BIOS for an option to adjust the amount of memory it uses but couldn't find anything.

I was wondering whether it's actually a result of the way I tend to use PrusaSlicer (PS), perhaps?

When prototyping, especially for part fitment etc., I will slice and print a few layers to check alignment and measurements. Then I'll edit the model, click the delete icon in PS, re-import, reslice, and print the same few layers again - so PS will be running continuously all day, loading, slicing, and deleting models over and over.

It never happens straight away - just after prolonged use, so I was wondering whether perhaps it is a memory leak which I'm (eventually) tripping over?

I'll use it over the coming weekend and see if I can be a bit more specific, derive a reproducible set of steps, etc. I'll also do the same on my gaming PC, with a discrete GPU, where I can't remember whether I've seen the same symptoms, or not.

[foreachthing]

Try this: https://github.com/prusa3d/PrusaSlicer/issues/3845
at the bottom of the issue: How to enable software renderer.

[lukasmatena]

It never happens straight away - just after prolonged use, so I was wondering whether perhaps it is a memory leak which I'm (eventually) tripping over?

If it happens after longer usage, this is also possible. Try monitoring GPU memory usage and you should be able to tell for certain. We may also try to reproduce it. Just out of curiosity, what does "prolonged use" mean (time, number and size of models loaded, etc)?

[TimWilde]

Prolonged use would be many hours, sometimes all day. I would load and reload models maybe dozens of times as I work; though usually the same one over and over for revisions. The model in the screenshot above has around 160,000 polygons and is about 8 megabytes, on disk - probably one of the largest I've worked on recently.

I don't use Reload from disk (not available after using Cut, it seems) or File > New Project because I assumed that would reset settings (which, I just checked, it does't).

My workflow is a cycle of:

1. Design model in Fusion 360, then export to STL
2. Delete any existing models from PrusaSlicer (Delete All)
3. Import new model to PrusaSlicer (Add...)
4. Use Place on face, Rotate, and Cut to trim the model down to a piece of the model I want to test so I can avoid massive prints before discovering problems
5. Slice this sub-part of the model and send to the printer, using Octoprint
6. Go and watch the print, because even after _years_, it's still mesmerizing! 😁
7. Check printed model and if there are problems, go back to step 1
8. Reload the full, untrimmed version of the model (Delete All, Add...) and send it to the printer via Octoprint
9. Babysit the first few layers to make sure the print looks like it will be OK.

[TimWilde]

I'll keep an eye on GPU memory (I just realized it's available in Task Manager > Performance > GPU which says it is sharing 8GB - 50% of the system memory)

[enricoturri1966]

I've checked in both Windows' Device Manager and the (daftly named) Intel "Graphics Command Center" and both report the drivers are up to date.

That's strange because, according to the log you attached here, you are using version 23.20.16.4849 of the driver, while from the link I posted you could get version 27.20.100.8280, just a few days old (29/05/2020).
In any case, you are using an integrated GPU, so the memory should be shared by CPU and GPU and if there is a memory leak, which is possible, then the memory for your GPU is getting lesser and lesser at each iteration.
Could you please share the model you are using so that we can try to repro ?

[TimWilde]

... according to the log you attached here, you are using version 23.20.16.4849 ...

Yes, I installed Intel's driver; sorry, I should have said is that all drivers are _now_ up to date 😊

Here's the model from the screenshot:
SphericalSpeaker_v2.zip

[enricoturri1966]

Thanks.
It turns out that I have the same graphic card on one of the PCs I am using.
I'll try to repro your issue.

[TimWilde]

Good news, everyone!

I've spent about 3 hours this morning specifically attempting to reproduce this and haven't been able to! 😃

The only change I made to the system is the updated Intel graphics drivers.

I kept an eye on GPU memory usage and, even with all sorts of other apps running at the same time to stress resource usage, it's been very frugal.

I'm going to close this as there's no point having it hanging around _just in case_. I'll revisit this if I experience the problem again.

Thanks for the help @enricoturri1966 and @lukasmatena 👍

[lukasmatena]

@TimWilde Thanks for letting us know.