I was wondering why nobody already considered the alternative use of the standard (non vray-) displacement modifier.
While playing around, I found a lot of benefits. While using it, there is a proper preview of mesh-deformation.
I tessellated / smoothed both meshes, but when I use the corona displ.shader option, I don´t like how it handles the details
and transitions between e.g. grout > bricks.
Another point is the fact, that I can collapse the object with the former displacement to a new "bricky" mesh, which might safe render time.
I hope nobody will abuse me for this proposal, just an idea.