unity3d - Mesh Collider that detects transparency -

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i have lots of meshes 2d project place on quads (as material quads). they're "maps"; filled inside have transparent edges.

i make polygon collider each map , place on top of can use physics2d.raycast() detect whether user has placed object on map or off map. they're shapes (polygons).

the process of making polygon collider time-consuming , quality isn't good. there mesh collider detects transparency , therefore shapes shape of map? or there way make script shapes collider shape of map?

turns out polygon collider 2d has feature generate polygon such transparent mesh. drag , drop sprite on polygon collider component.


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