Any tips on speeding up the carpaint shader?

[simmsimaging]

I've finally started getting something I really like with the Vraycarpaint for a metallic finish. It just took a lot of putzing to find some settings that worked and a bit of blending etc, but it looks pretty good to me.

However it renders super slow. I'm pretty sure it's just anti-aliasing the 1.5 billion flecks in my 11K render - but wondering if there are any good general setting tips for this kind of material? I am running BF/LC with AA at 1/20 and plenty of material sub-ds where I can. I have no aa filtering on at all.

Would something like Area anti-aliasing actually speed this up? generally I find the AA filtering is slower and unnecessary for me. Anything else to play with that might help?

/b

[Dariusz Makowski (Dadal)]

U really need GI for cars ?

Use 32 sample for lights(up to 128+ for dome), materials and 5-20 AA DMC.

GL.

[simmsimaging]

I would say yes, but it's not a car anyway
I will try 5-20 and see if it's faster. Thanks man.
b

[Dariusz Makowski (Dadal)]

U definietly need more than 8. If u use metalic then the glossy samples need more than 8 to render faster and not slow down AA.

ps I ment 32 samples for materials too as well as lights...

GL

[Neilg]

I will try 5-20 and see if it's faster. Thanks man.

going from 1/20 to 5/20 is going to be much slower...

Hows your reflection depth/can it go any lower?
In your light cache, turn on pre-filtering, use lightcache for glossy rays, and interp samples to 100. see what happens.
Could consider changing your GI? brute force is horrifically slow and telling the difference between that and a well set up IRmap is near impossible. aside from the extra noise on the BF render...

[Dariusz Makowski (Dadal)]

Hard to say if I dont know scene set up. All things varry... If u go up only on AA it will go slower, u need to have equal samples in materials so engine dont strugle to clear material noise using AA but actually material... I would not use GI at all tbh - but like I said, I need to know what is in scene to optymize it...

[simmsimaging]

going from 1/20 to 5/20 is going to be much slower...

Hows your reflection depth/can it go any lower?
In your light cache, turn on pre-filtering, use lightcache for glossy rays, and interp samples to 100. see what happens.
Could consider changing your GI? brute force is horrifically slow and telling the difference between that and a well set up IRmap is near impossible. aside from the extra noise on the BF render...

Thanks for the input!

Yep, you are right: it was much slower
Reflect/Refract depth is as low as it can go. Normally I use very high values for maximal realism, but in this case I dropped it down. It's kinda the same with GI. The IR setup is hard for me because I don't use it much, but I generally find that BF is not that much slower quite often, and it scales better when rendering at various resolutions (without having to change anything around). However, I did give LC/IM a try via SolidRocks and it was rendering slower by far than my LC/BF method.

In this case though, GI is very secondary - it really seems to be the AA that is doing it. I actually moved back away fom the vraycarpaint shader and back to my own custom one and it's rendering a lot faster. I think the flakes and AA just don't get along that well

DADAL: material samples are all at 32 or more. 32 is a base level for me. Lights are 32 to 64 . I can't say I saw much difference in time with those going up and down though.

/b

[Dariusz Makowski (Dadal)]

Not much about rendering quicker in upping samling. It just give better quality for same time. How long does it take to render/size/scene details?

Thanks, bye.

[simmsimaging]

It takes various amounts of time depending on the res and area - it's a hard thing to quantify. That's why I was looking for more generalized tips for busy materials like that.