Add API for getting assemblies

Feature Requests Engine Features
#1

In my game gravity is not constant everywhere, the player can go on the underside of planets and into space. I use a VectorForce in each object and calculate the direction and force of gravity every frame. This is not the most efficient method, it would be better to use a single VectorForce for each assembly

Currently there is no way to get existing assemblies or detect when ones are added or removed

--example
game:GetService("PhysicsService"):GetAssemblies(workspace.Model) --Get all assemblies connected/parented to workspace.Model

game:GetService("PhysicsService").AssemblyAdded:Connect(function(Assembly)
    print(Assembly.RootPart, Assembly.Parts)
end)
game:GetService("PhysicsService").AssemblyRemoved:Connect(function() end)

image

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#2

It would be really helpful if you could go into more detail on your use case and the problems you are trying to solve. (see How to post a Feature Request).
From what you have described, you could only add VecorForces to Parts where (Part.AssemblyRootPart == Part), which should guarantee only 1 VectorForce per assembly.

It’s important to note that there is no “assembly instance” that could accessed in the way you are proposing. It’s simply a set of connected parts. Have you seen the latest physics API additions here?

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#3

Oh I didn’t see that, doesn’t look like they’re documented at all on the devhub. So if I wanted to get assemblies, would something like this work reliably? In my game assemblies can also be split so I need to be able to detect that too

image
image740×395 67.8 KB 

local Assemblies = {}

for _, Child in pairs(workspace.Model:GetDescendants()) do
 if (Child:IsA("BasePart")) then
  local AssemblyRootPart= Child.AssemblyRootPart

  if (not Assemblies[AssemblyRootPart]) then
   Assemblies[AssemblyRootPart] = {}
  end
  
  table.insert(Assemblies[AssemblyRootPart], Child)

  Child:GetPropertyChangedSignal("AssemblyRootPart"):Connect(function()
   table.remove(Assemblies[AssemblyRootPart], table.find(Assemblies[AssemblyRootPart], Child))

   AssemblyRootPart = Child.AssemblyRootPart

   if (not Assemblies[AssemblyRootPart]) then
    Assemblies[AssemblyRootPart] = {}
   end

   table.insert(Assemblies[AssemblyRootPart], Child)
  end)
 end
end
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