Motion blur issue

[Dariusz Makowski (Dadal)]

Heya

I got a bit off problem. I have a 12x8k render I'm working on, from which I have to render 3 motion blur wheels. On average I have 12-24 samples, 5 lights, 1 IBL and render layers for each light. I also have fixed sampler at 2.

The issue starts that the minute I click render all goes to 45 gb ram and 53+ gb hdd page file and it goes at a rate of 1 bucked avery 5-10 mins... its like 4 days ETA.

I have canceled today another render that was going for 30h now and it was at 45%...

Im talking about 2k pixels or so per wheel which aint that much.

From past rendering in 3ds max this could be blazingly fast.

I wonder if it could be because I'm using 16 sampels subD but then again I'm only using 4 geometry samples... I dunno tbh. I cant find a per object motion blur controls.

The sampling on motion blur is pretty low, 4 geo/4part/16subD

The PC don't fell as if it was rendering at 100%, more like at 20% and the rest he was just doing some memory management or so.

Could be a subdibision displacement as I'm using it for smoothing my mesh ?

Has any1 got any idea how to get it to work ? For now I'm considering going back to mental ray to render it

[Morbid Angel]

Heya

I got a bit off problem. I have a 12x8k render I'm working on, from which I have to render 3 motion blur wheels. On average I have 12-24 samples, 5 lights, 1 IBL and render layers for each light. I also have fixed sampler at 2.

The issue starts that the minute I click render all goes to 45 gb ram and 53+ gb hdd page file and it goes at a rate of 1 bucked avery 5-10 mins... its like 4 days ETA.

I have canceled today another render that was going for 30h now and it was at 45%...

Im talking about 2k pixels or so per wheel which aint that much.

From past rendering in 3ds max this could be blazingly fast.

I wonder if it could be because I'm using 16 sampels subD but then again I'm only using 4 geometry samples... I dunno tbh. I cant find a per object motion blur controls.

The sampling on motion blur is pretty low, 4 geo/4part/16subD

The PC don't fell as if it was rendering at 100%, more like at 20% and the rest he was just doing some memory management or so.

Could be a subdibision displacement as I'm using it for smoothing my mesh ?

Has any1 got any idea how to get it to work ? For now I'm considering going back to mental ray to render it

You got a difficult task. How much ram exactly you got? in any case there is a few things I can suggest:

- to give per object motion blur geo samples, you can use vray object properties node, there is a geo sample override there.
- to render such large image you may need to render to vrimg format
- to render large images you may need to use tiled exrs, to save on ram

[vlado]

I cant find a per object motion blur controls.

They are in the same place as in 3ds Max in - in the V-Ray object properties. From there, you can change the number of geometry samples for motion blur for the wheels only. There is no need to set everything to 4 geometry samples.

The things that Dmitry pointed out are all good suggestions; in addition to that, setting the geometry type to "Dynamic geometry" and turning off any displacement/subdivision on the wheels will also help.

Best regards,
Vlado