When Union:SubtractAsync, example like this
Is possible to let floating part fall?
if not possible,this would be very Unfair 
local success,sa = pcall(function()
local sa = part:SubtractAsync(list,Enum.CollisionFidelity.PreciseConvexDecomposition)
-- list var is Lot Of Parts
return sa
end)
I’m not sure i understand your issue, do you have a union, that consists of two or more unconnected parts, of which you just want one of the parts to unachor and fall, while the others remain anchored?
(Oops, i just noticed this post is 9 months old)
Yes I think thats what hes asking, (i have the same issue)
To reword it,
If you have created a union using subtract Async, how can you detect if a certain section of the union is separate/not connected to any other part?
I tried having a look at the documentation, but i couldn’t find anything that will do so. It seems the only things you currently can do with unions are:
The new CSG API will allow you to get multiple objects back from async functions, so they can split as expected. It’s still a Studio beta for now