LC Retarace in exteriors

[re vit]

I realized that using the Subject means up to 30-40% time loss.

Do you use it by default? Or only when some bold issues are seen?

Thanks in advance

[Francisco Penaloza]

well by the manual, it explain that it will increase rendering time, just like everything in V-Ray if you want more quality, you need to pay the price... time.

Having said that, personally for exteriors I usually use, Irradiance and Brute force as second bounce. LC is not friendly with large scattered areas or displacement. But that is my take on it.

Outside scenes, usually have more light, Retrace may not be nessesary

[re vit]

LC is not friendly with large scattered areas or displacement

Hmm.. What exactly is unfriendly? Memory consumption, quality?

[Francisco Penaloza]

yes it uses a lot of memory.

[re vit]

And how many Secondary BF Suubdivs in your opinion are enough for good quality 12MP still? 36?

[Francisco Penaloza]

on the 30's or 60' depending of the lighting. Most of the work will be done by Irr any ways.

If you can see the interiors of your building, they will be definitely darker, so be aware of that, and try to compensate with interior lighting if necessary.