So I have a part, which I want people to be able to put windows on, similar to bloxburg. This way would make a union where the window should be and place the window. I was wondering if bloxburg creates unions because that is impossible, so I want to know how they do that.
You can use
BasePart:UnionAsync(OtherPartTable)
where BasePart is the part you want to union, and the parts in the OtherPartTable are the parts BasePart will union with.
For example:
local part = workspace.Part1
local otherParts = {workspace.Part2, workspace.Part3, workspace.Part4}
local newUnion = part:UnionAsync(otherParts)
Alternatively, if you want to subtract from a part, you can use BasePart:SubtractAsync(OtherPartsTable)
for example:
local part = workspace.Part1
local otherParts = {workspace.Part2, workspace.Part3, workspace.Part4}
local newUnion = part:SubtractAsync(otherParts)
For more information:
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Is there a way to Un Union with a script?