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# Non-rectilinear core area
Tool: Initialize Floorplan
Subcategory: Floorplan customization
## Conversation
### Blebowski
Hello,
is it possible to somehow specify core-area that is non-rectilinear (e.g. as a group of polygons surrounding concave shape) ?
I understand that if doing "digital on top" FP where all the analog is a digital macro, this does not make sense. However, it may be usefull in case where "analog-on-top" is done, and digital may have some weird shape and is eventually placed as hard GDSII macro into analog-on-top design.
### maliberty
The simplest would be to make a rectangular block and add placement and routing blockages for the disallowed area
### Blebowski
Thanks. Can I then do the `add_pdn_ring` around just the cut area (e.g. L-shape pdn-ring) ? Or is there some other trick how
to achieve this ?
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