Irradiance pre calc problem

[dougvanderpas]

Hey,

Having a problem with a fly-through. Tried a few things and read a few forums but it doesn't seem to solve my problem.

 

I'm on Vray 1,50 SP3

 

I am pre calculating my irradiance. I have tried "multiframe incremental" and also the "animation pre-pass". I'm rendering every nth frame (10th). I'm setting my secondary bounce to none. My "don't render final image" is checked. It seems to calculate as expected.

 

When done I load my irradiance from my saved location. un-check my "don't render final image" and flip my nth frame back to 1.

 

I wanna use a light cache for secondaries, so for now I'm just gonna calculate per frame.

 

I render and get a dark image!! When I render and calculate single frame it works fine.

I was using "distributed rendering" and then found out that this was not compatible when pre-calcing irradiance. so then i tried calculating locally but with the same result.

The only time I get my illumination correct is when I calculate per frame but this is leading to flickering.

 

I enclosed an image. It actually looks like the light cache is off but I assure you that it is on and it appears to be calculating as normal.

 

Your help would be appreciated! cheers

[tayrona]

As far as I know, you must calculate Light Cache first. When you use de IMAP + LC combination, Secondary bounces must be calculated before first bounces.

[Deetee]

try calc light cache 1st, then load it and calculate IR.

 

probably it is better u post this in vray section. u might get better respond.

[Stephen Thomas]

You're right, it is calculating the light cache but then it's not using it because you are using a pre-calculated irradiance map instead which only contains 1 bounce. That is why it is so dark. You must have your secondary bounces on when you calculate your irradiance map.