found the weirdest bug - i have a scene, when i render via IR its fine. via normal its fine when its relatively ,ow res (ie 2000x1000) but when i render over 6k one of the main elements (a background house estate) - it disappears. i cannot figure it out - anyone else having this issue? im on latest daily
my uneducated guess would be your PC is running out of ram and dropping some scene assets.
Feel free to drop us a scene at https://support.chaos.com/hc/en-us/requests/new
We had single almost exactly same report some time ago, which was not reproducible on our side, IIRC.
Please send the scene over so we can progress on this.
it rendered at 4000x2250 fine. ill try later at 6k. I dont think its a ram issue as a i have 512GB ram… but who knows. If i cant get it towork by monday ill send the scene.
what was the issue with the other scene? do you have details of it?
Are you using Forest Pack by chance? I was just working in a scene and un-hid a forest pack item. All objects disappeared from IR, just showed corona sky. I have had this happen often enough that I saved the scene, because I knew it would crash once I hit ‘stop’ on IR (it did.) Not exactly your bug but FYI just in case you are using forest pack, could try it without shrug
Dan
The disappearing object was XRef-ed, rendering scene in 5k was fine, rendering in 6k made specific object disappear.
Ticket was closed some time ago, cannot get any more details.
for sake of tracking: (Report ID=CMAX-1268)
It looks like in the previous report the issue could have been related to displacement, which kind of makes sense, as displacement has some kind of subdivision limit, which you may hit when rendering in a high resolution (you should get a notification message though). If you are able to reproduce this, could you check if disabling the displacement checkbox in Render Setup > Common fixes this? This would let us know if it’s related to displacement at all.
I had this issue a while back and it was indeed a displacement issue
yep, this is it. i disabled it in settings and it worked.
so weird, this scene isnt near enough as big as other scenes ive done. there are only 2 objects in the scene with displacement modifiers (set to 1pixel) but i have 15 other materials with standard displacement within the material. I disabled some materials and now it works. Whats the tech reason behind this? PS i have 256MB ram and a TR 5995 (i previously stated i had 512, but i dont, i completely forgot how much i had)
Over 6k resolution + 1px displacement = looooots of triangles. You can try increasing displacement screen size to 4px or more. We would be still interested in looking into this as in such cases there should be an error message explaining what is going on.
Hi all - so if it isnt a RAM issue, its a software limitation - is there going to be a fix? its happening on another scene.
in the code, whats the RAM or Memory limit when it start to do this? if i could know that i can monitor things.
Also, it could benefit from a warning?
You should be getting this error message: https://support.chaos.com/hc/en-us/articles/8824357390609
If you are not, please send us a sample scene where this is happening through https://support.chaos.com/hc/en-us/requests/new
There is no RAM limit in the code (Windows 11 Pro RAM limit is 2TB 
). This is about the number of generated vertices.
My question would be: do you really need such high displacement quality in such a large resolution? Perhaps you could get away with increasing displacement size 2x or 4x in Render Setup > Performance without visible quality loss?