GI brute force bug

Hi,
We work on a feature film and we have some shots with boats and armies.
I have a problem with a shot, you can see the problem in this image :

This problem is here when i use brute force GI. It is just on 1 camera (i haven’t this problem on others cameras) and just on 1 boat.

The problem disappear when i set the secondary ray bias to 0.005.

My question is : it is a bug ? What is it ? A optimization ?
It is just a curiosity because we resolved the problem with the secondary bias.

Thanks.

Looks like you have very big scene in terms of distances between camera and other objects.

Hm, I’m not sure what it is - if you can get me just that part of the geometry to vraymaya@chaosgroup.com I will be able to tell you more.

Best reards,
Vlado