visibility cache rebuilding in viewport - bidir

[lacilaci]

I think environment visibility cache in rebuilding in blender viewport rendering for bidir rendering.
I think this cause viewport is very unresponsive when cache is enabled in world settings

[Dade]

I think environment visibility cache in rebuilding in blender viewport rendering for bidir rendering.
I think this cause viewport is very unresponsive when cache is enabled in world settings

Yes, all pre-processing is disabled for RTPATHCPU/OCL but it is not for BIDIRCPU.

However this is something BlendLuxCore must take care of (i.e disabling all caches for view port rendering with BIDICPU) because LuxCore can not know if BIDIRCPU is being used for a view port rendering or a final rendering.

[B.Y.O.B.]

I have fixed this problem in the 2_79_maintenance branch, 2.8 branch still todo.

edit: done in 2.8 branch as well.