need light cache help with region

V-Ray V-Ray for 3ds Max General
1

I just need to know if my thinking is correct. Since regions tend to be lighter I assume yes, but I really want to know if it’s right.

I’ve got a 5k render using irradiance map, med, and light cache, 2000 subdivs.

OK, then I do a region, it’s lighter. Is that because it still does a full 2000 samples in that small region? Should i really be figuring out how much of the screen is being shown and use only that percentage of the original amount. So if say I use a 1/4 region, then I should have 500 subdivs for that region?

that seems to work, but it’s hard to tell. I know it won’t be exact, but that will at least be closer, not to mention quicker.

2

It will use proportionally less samples, depending on the region size. This may be the reason why it’s a little different.

Best regards,
Vlado

3

so I really shouldn’t be manually reducing the number of samples then?

4

No need, V-Ray already does that automatically.

Best regards,
Vlado