Multiple grids have black walls

[LeDoublet]

I have run into some really weird rendering errors with fumfx 3.5.2 I have attached a file which sows the error. Basically grids within another grid will render odd black walls and other black artifacts. I have tried re-simulating the grids with soft falloff and this makes no difference. The frustrating thing is I had them working before upgrading to 3.5.2. on the same file. Any thoughts?

[sitnisati]

Hello,

Can you please let me know which renderer do you use ?

Thank you.

Kresimir Tkalcec

[LeDoublet]

I'm using mental ray

[sitnisati]

Hello,

Do you have Autovolume enabled and did you move grids away so they're not perfectly aligned (as shown in the help file)?

Thank you

Kresimir