adjusting the min/max irradiance numbers

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

is there a mathematical method for calculating how to increase the iraddiance map passes as you increase the resolution?

meaning… am rendering at 1000x750 with my min pass set to -4 and max to -1. now i want to render at 4000x3000 without a precalculated irradiance pass. is there a way to figure out the min/max numbers without trial and error?

2

You reduce the values by 1 for every doubling.

So, 1000px wide to 2000px wide goes from -4 -1 to -5 -2
Then 2000 to 4000 goes to -6 -3

This is in keeping with the old IR precalc method anyway.