Create a region with Region3 using the CFrame and Size properties.
Here is the documentation for it.
https://create.roblox.com/docs/reference/engine/datatypes/Region3
This post should also been helpful:
Create a region with Region3 using the CFrame and Size properties.
Here is the documentation for it.
https://create.roblox.com/docs/reference/engine/datatypes/Region3
This post should also been helpful: