I'm trying to make some green pavers using rail clone and forest pack. All was good until I hit render. In interactive mode the results were as expected but as soon as I switch to production (progressive or bucket) the results are wrong (the grass is growing through the pavers).
The setup is pretty basic. The concrete pavers are scattered using RC. and this RC object is used as an exclude geometry for the grass.
If I copy the RC, turn it to poly and use that as an exclude geometry it seems to be working... so I'm not sure if this is a FP or RC issue.
Vray 5.20.02 (build 00001)