Grouping shadow points

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Hi, i want to group shadow points , can some one guide me how to group it. in scene i have one point light which is casting shadow at the box and i want to have the points of that shadow area only.

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group_help.JPG (49.6 KB)

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here is the VOP SOP example how to do such thing

Attachments:
vop_group_shadow.hip (159.8 KB)

Tomas Slancik
FX Supervisor
Method Studios, NY
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thankyou
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