HDRI rotation animaton: GI settings

[Tom Bussey]

I have created an animation with a rotating HDRI map. The only other animated element is the camera.

 

Can I collect Light Cache, Irradiance map, both or neither, or Brute force/brute force likely to be the fastest way to go?

 

The sequence is about 1850 frames long and the camera takes a winding path, turning about 270 degrees around a housing estate and starting from an aerial view point. I'm using vray 3 / 3DS 2014.

 

Thanks.

[Francisco Penaloza]

I vote Brute Force, LC not saving LC. If you have many scattered object and Displacement, I would recommend Brute force/Brute force.

[Tom Bussey]

Thanks, I did go for Brute force / brute force in the end and frame times were good.

[Chris MacDonald]

Unless the HDRI is a time lapse (which wouldn't need rotating) that's going to look really weird, no?

[aaronrumple]

I used a static HDRI with a rotation for a short clip. It worked out fine for the intention. Looked like the clouds were moving slowly and the light changes were subtle. I had a direct vray light which didn't move. As long as the clip is short - few seconds - it can work.