Find touching same type polygons

Hi guys,

i'm trying to do something which i assume is fairly basic. Within a
layout view i want to find all polygons of layer "OD" that overlap or
abutt.

2 methods i can think of:

1) An Assura DRC, a boolean operation to find area in common. Finding
any shapes that overlap was easy using geomAnd( OD ). Then to find any
abutting OD i tried:

OD_1 = geomSize( OD 0.005 )
OD_2 = geomAnd( OD_1 )

However, it looks like i cannot use geomAnd on a derived layer, is
that true(the manual seems also to infer this is the case)? I've tried
stuff like geomButting but this requires 2 input layers and i am only
dealing with one.

2) Skill

I suppose i could grab the co-ordinates of all OD polygons (i'm only
dealing with squares and rectangles anyway) then step through each
shape's co-ord's to find if any co-ord of the other shapes exist
within the polygon in question. The problem for me is i don't really
use Skill so would be starting from scratch but any tips are
welcome....might be a good way for me to learn the basics of it.

My preference is to use a DRC check as this seems like a simple
logical operation.

Thanks

Stu

 

[Andrew Beckett]

stuart.duncan@gigle.biz wrote, on 04/20/09 13:42:

Hi guys,

i'm trying to do something which i assume is fairly basic. Within a
layout view i want to find all polygons of layer "OD" that overlap or
abutt.

2 methods i can think of:

1) An Assura DRC, a boolean operation to find area in common. Finding
any shapes that overlap was easy using geomAnd( OD ). Then to find any
abutting OD i tried:

OD_1 = geomSize( OD 0.005 )
OD_2 = geomAnd( OD_1 )

However, it looks like i cannot use geomAnd on a derived layer, is
that true(the manual seems also to infer this is the case)? I've tried
stuff like geomButting but this requires 2 input layers and i am only
dealing with one.

2) Skill

I suppose i could grab the co-ordinates of all OD polygons (i'm only
dealing with squares and rectangles anyway) then step through each
shape's co-ord's to find if any co-ord of the other shapes exist
within the polygon in question. The problem for me is i don't really
use Skill so would be starting from scratch but any tips are
welcome....might be a good way for me to learn the basics of it.

My preference is to use a DRC check as this seems like a simple
logical operation.

Thanks

Stu

Stu,

I answered this on the Cadence forum (on www.cadence.com) but the answer is to do:

OD_1 = geomSize( OD 0.005 unmerged )
OD_2 = geomAnd( OD_1 )

Your explanation above answers my question on the Cadence web-site forum as to
what you were actually trying to achieve!

Regards,

Andrew.

--
Andrew Beckett
Senior Solution Architect - Cadence Design Systems Ltd (UK)