Unhiding a Forest object while on IR causes 3ds Max to crash

[hurrycat]

So as the title says, if you open a 3ds max scene that has a hidden Forest object, then go into IR and then unhide it while on IR, 3ds Max will probably crash.

Happening on 3ds Max 2024.2, Corona 11. I remember it happening also on 3ds Max 2023 and Corona 9.

[TomG]

Do you have the minidump from such a crash? Those are always handy in the event of crashes :)

[Avi]

Hey,

I just tried to repro it using the latest version of Forest Pack, Corona 11 HF 1 and 3ds Max 2024.2. It's not happening to me. If the issue persists with you and you are using all the latest version of software then feel free to send us a scene along with some repro steps by starting a ticket here: https://support.chaos.com/hc/en-us/requests/new

Ps: don't forget to include the minidump of the crash.

[hurrycat]

I tried it also right now, after updating to Corona 11 HF 1 and the problem is still there, but I couldn't also reproduce it at first. Here is what I did:

1. Open empty scene. Make a plane. Create a Forest Pro object on the plane (Forest001). Choose a preset (eg. Layered Lawns). Create a Corona Sun. Hide said Forest object, save and exit.
2. Open the same scene. Go into IR, unhide the Forest object. No crash happens, it renders fine.
3. Create a second Forest object (eg. Meadows) on the same plane (Forest002). Hide both, save and exit.
4. Open the scene, go into IR. Unhide Forest002, no crash occurs. Unhide Forest001, 3ds max crashes.

So maybe you have to add complexity to the scene and then it may lead to a crash. Let me know if you can reproduce it now.

[Avi]

Can you let me know which version of Forest Pack you are using?

I tried the repro steps and went even further with adding more forest pack objects, but it still does not crash but if I keep going and reach my resource limit then OfCourse it may crash.

Can you perhaps share a scene file by starting a ticket so we can investigate it further?

https://support.chaos.com/hc/en-us/requests/new

[hurrycat]

I am using the latest Forest Pack Ver 8.25. CPU 3970x, 128gb RAM, GPU GTX 1650. I wll start the ticket and upload the mini dump and the scene as soon as possible!

[Avi]

Hi, have you started a ticket yet? Feel free to do it when you have time. Just sending a reminder. :)

[maru]

Reproduced with Corona 12 U1 HF1 using the scene from https://forum.corona-renderer.com/index.php?topic=43962.0 and reported.

(Report ID=CMAX-1473)