lighcache sample and filter value

V-Ray V-Ray Common Render Theory
1

What is the exact technique to catch the good size for a world unit?
I have read the help file which says the param between the sample and the filter size x4/6, but I haven’t understood how evaluate the size of the samples.
I’m trying but I’m loosing time and nothing better.
Please if someone have a good explanation.
thx
:wink:

2

The way I set up this is as follows:

Create anywhere in your camera view a small sphere with the approximate apparent size that you want the samples in the light cache to be. Note the sphere radius, and enter this value as the sample size parameter. From there, set the filter size to be 2 to 4 times greater than that, depending on the smoothness you want to get.

You can then delete the sphere.

Best regards,
Vlado

3

thanks Vlado for the quick answer(two time ;)) I’ll apply this.
But I’m not sure of the sample good size.
here my scene:
the sphere seems good or bad?

4

This should be about fine, yes. You can make it smaller for more detailes in the light cache, but usually this is not necessary.

Best regards,
Vlado

5

oh yes, thanks it works great.

6

could u show the image please u tested with ball and relative radius used in sample size of LC?

thanks in advance

7

http://www.chaosgroup.com/forum/phpBB2/viewtopic.php?t=18556
this is the first pict, but not enough small to catch the shadows the samples were. /10 they were good but like Vlado have said not enough subd.
cheers

8

hi vlado

would this also work for the size of the DE in irradiance map?

best regards
themaxxer

9

Yes, but only for the “World” mode of course.

Best regards,
Vlado