Topics

1

[Max] General Discussion / OSL, max and corona

« on: 2020-09-04, 09:20:04 »

Hi there.
I would like to know if corona supports "officially" osl maps ?
I mean, ok it works when i use it, but osl are not mentionned here : https://corona-renderer.com/features/features-full-list
It would be nice if a dev could tell me if it's reaaaally safe to use it, to use hundreds of osl maps.

ppl in my team ask me :"hey i have downloaded this osl or this one because they are cool", but since it's me who solve issues when there are, i am not very confident at putting osl everywhere in our scenes. I have enough to troubleshoot, i don't need more :)

Ty ^^

2

[Max] Resolved Bugs / NaN

« on: 2019-04-03, 14:33:15 »

Hello.
I am experiencing troubles with our renderfarm and a lot of NaN. See the preview below

I can not share the scene so here some specs :

We are using corona 3 (not sp1) with max 2018 sp4 on w10 x64 1809
Railclone3.2, forest 6.1.2
Lens distortion on cam
Displacement (preview actually, still in sceen space 10px + autobump)
Using UHD, precise mode + new light solver
filter blackmann 2.5px, hilights clamp at 10, shading clamp at 15
direct sample 2, givsaa 24
environment override + linear exr
visible bg override to pure black
no tonemap, no bloomglare, no lut, no blur/sharping or anything vfb related since it's comped in nuke.
only coronamtl and corona related assets (coronabitmap, layer etc)
no irregular stuffes like rayswitchers etc.
using cessentiols, lightselect (no lightmix buffer) and some datachannels(pos, uv, velocity, z etc.)
denoising 9 renderelements (essentiels and light select) with cpu/prod denoiser
Saving exr rgba half float premult zip as scanline

As you can see on both column (different frames), lots of nan.
I think the problem is related to exr cause as you can see, the light select (either sun or environment) have no problem. But the beauty and essentials (all) have nan. Alpha, velocity, worldpos, z depth and others datas are ok.
I would like to avoid upgrading the whole agency to corona 3 sp2 this Week cause my deadline is tight. And usually we do not upgrade sofwares during production timeframe. And i can not be sure it will solve the issue...
Actually i comp-build the beauty with nuke and bust nans with a "secondary" beauty rebuilt from the 3 lights selects components i have (sun, env, and artificials) but it prevents me from using others buffers.

Here are others informations i did not tested very much so it's hard to say if it's really involved or not but it seems :
- saving jpg reduces the problem and maybe resolve it (but i may not comp with jpg)
- using double path tracing (instead of uhd) reduces the amount of problematic frames
 -disabling new light solver reduces the problem

I am pretty aware you cannot solve the issue just looking at a frame on a forum, but can you tell me what produces nan in general with corona ?
Thanks

3

[Max] General Discussion / Does corona handles multi tiled exr ?

« on: 2017-06-04, 13:00:51 »

Hi
Well everthing is in the title. Corona loads the exr correctly, but so far, i see no difference regarding ram usage using a multi tiled exr or a bmp when i render a very very small region of a huge texture.
I ask this cause in our agency, we often have to render zoom from space to ground. So we generally use multi tiled exr with vray so when we are at ground level, only the required tiles are loaded to ram.
It's hard to guess with corona, and we have memory issues so...

thanks