Really bad spots on render

[paraganek]

Does anybody know what is going on here ?



It is just a standard scene - vray lights in windows and one Direct Light. I prerendered the IR map for a short animation for every 5th frame and this is how it is rendering from this saved IR map. The Vray lights have "Save with IR map" box checked. Any suggestions greatly appreciated

[natty]

hi
you need to save the irr map with .... incremental save option ticked...
then it will add the map frame by frame and keep it nice and smooth for the final animation.

[paraganek]

you need to save the irr map with .... incremental save option ticked...
then it will add the map frame by frame and keep it nice and smooth for the final animation.

Thanks Natty, but that is what I have done, I am using Incremental option. This must be something else.

[dbuchhofer]

Thats what the artifacting looks like when you dont have anything in the IR maps for that area..

you can add it in by rendering from file once.. switching to incremental add, and rendering again (to add the missing areas to the saved vrmap) then resaving the file..

Had to do this a couple times to 'touch' up prerenderer irradiance maps that had either too high of a time step, or too much movement inside of the time step in..

Same things happen if you have animated meshes with a saved irmap.. just doesn't have anything useful in the file at that point.

[ml-a]

Hi

Maybe you forgot to reset the irradiance map at the begining. Just a thought!

[dusan]

are you sure that you rendered that part of the room when you were calculating the irradiance map?

[natty]

yeah it looks like that part of the map is missing to me ?

[paraganek]

are you sure that you rendered that part of the room when you were calculating the irradiance map?

Absolutely sure. It is the same camera used both for the IR map calculation and the rendering frames. I render on a render farm so I submit first job (render on one machine, camera view, IR map, every fifth frame) and then I submit second job dependent on finishing the first one (render on all machines, every frame, use saved IR map). This has always worked untill now.

What if I uncheck "Store with IR map" for all the vray lights and re-render the IR map? Or does this optin have to be on when rendering an animation on more machines with a precalculated IR map ?

[dbuchhofer]

well, thats a dead match for the 'ran out of irradiance map' thing..

the only other one that looks remotely like that is the 'double faced geometry' one, but thats usually more of a randomized checker pattern.

If it works in Single Frame..
and it works with the From File at that frame locally.. its a new one to me

[natty]

well it one of three things :

1 : your using the wrong part of the irr map for the camera move.
2 : your not using Incremental add to current map or reseting the map when you start the calcs.
3 : You are using an incomplete Irr map.

its not a bug but typicaly a srewed Irradiance map.

[paraganek]

Thanks everybody, I am going to re-render the IR map and see what happens.

[paraganek]

Thats what the artifacting looks like when you dont have anything in the IR maps for that area..
you can add it in by rendering from file once.. switching to incremental add, and rendering again (to add the missing areas to the saved vrmap) then resaving the file.

Thanks alot dbuchhofer !
That helped. I do not know why the IR map was screwed up but when I loaded it, re-rendered the first frame, added the new map to the saved map and started rendering the frames with the new map again from the beginning, IT WAS OK

Thanks again for a great tip