UHD cache - animation preset strange black render result ??

[tmsfischer]

Hi guys,

I have a biiig problem. I'm working on an animation project, and just rendered 200 frames out of it with UHD cache, animtaion (flicker free ) preset ( 'cause i have trees, naps, lights moving in the scene ) and i have got totally randomly thirteen frames ( of the 200 ) which came out black, or almost black - see attached...
I have tried to render one frame with HD cache, and got no problem(but cannot re-render all with HD cache, cause flickering...)

Have you ever seen this? What can be the problem?
Thanks in advance!

[romullus]

Looks like bug to me. Let's move it to bug reporting board and see what happens.

[atelieryork]

Did you pre-render the HDCache on its own and set to Load From File, or are you rendering and appending the UHD file for each frame along with the main render pass?

[tmsfischer]

No, i didn't pre-render HDCache, and didn't set to load from file, it's on "calculate from scratch", UHD, animation preset , so for each frame...
any idea?

[Nekrobul]

I had exactly the same problem lately. But i cant remember how i solved it.

Only thing i remember that this was apearing when i was using DR and only specific cameras were afected. I can look for this scene and try to to remember how i solved it.

Actualy it kind a looks like Displacement+messed up boolean mesh. So most probably that is bad geomety what is causing it.

[maru]

We have a similar report in support right now, but it happens when rendering with Corona+Deadline. And it probably is not uhd-cache related.

-are you using Complex Fresnel plugin by Siger or any Siger materials?
-are you using displacement?

-can you try rendering with no UHD Cache (pt+pt) - this scene should not profit much from using UHD so it should be fine to render it with pt only, and we would check if it's UHD-related

[tmsfischer]

And yes, i was using DR (on rebusfarm...) but no boolean mesh in the scene, and not even displacement ( only on soil in the small vases.... )
but bad geometry, what can it be? i think everything is proper, box, cylinder or line based models most of them, some trees and plants from evermotion but nothing too complicated...

[tmsfischer]

Hi Maru,

-no complex fresnel plugin, no siger materials.
-displacement just on small planes (there are 3 of them... )

I already tried with PT + HD cache, but not yet PT+PT...
BUT
the problem is that its completely random, i mean,
-i rendered on rebus farm all 200 frames first( yesterday )
-came home, checked the results and frame n°14 , 19, 20, 22 etc...fourteen frames bugged
-so than i re-render only the bugged frames  on my computer yesterday night
-this morning, checked the results, still 2 frames bugged ( but the others are OKAY! )
- so than rerendered these 2 again with HD cache, and everithing is okay ( except for every ex-bugged frame are flickering now....)

[maru]

Important question which it looks like hasn't been asked yet: which version of Corona are you using?

-displacement just on small planes (there are 3 of them... )

The question was if there is displacement at all. So there is. Can you check what happens if you disable displacement completely? ("displacement" checkbox in common render settings)

I already tried with PT + HD cache, but not yet PT+PT...

Please try with pt+pt.

[tmsfischer]

My corona version is 1.2.1

I disable displacement and try PT+ PT now ( is pt+pt flicker-free in active animation?...)
I let you know,

Thank you !

[maru]

My corona version is 1.2.1

Why not 1.3?

( is pt+pt flicker-free in active animation?...)

Could be noisy, but not flicking.

[tmsfischer]

Why not 1.3? Because i just ask rebusfarm last week if they support 1.3 and they said just from this week so as i was afraid i didn't want to take risk .. :)

pt+pt is rendering now with no displacement, but for the moment seems everything ok....
i send the view in a  few minutes...

[Ondra]

My best guess is that is is a NaN problem caused by faulty texture or incorrect mesh + displacement. Such problems should be fixed in 1.3. If you provide us the scene, I can check if I can reproduce the problem in 1.3, but I would not count on it

[tmsfischer]

Here is the image attached, with pt+pt with no diplace...

[tmsfischer]

And what if i have my scene (so made in 1.2.1) , and i upgrade to 1.3 by myself. By upgrading, does it change anything in the render result?
Should i change something ( like when i upgraded to 1.2.1 and opened an old file,  i had problems with the old version sun, so i had to change it ... )  ?
'cause if not, i am up to upgrade of course  (even rebusfarm, i checked they support now! ) :)
Thanks!