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-- Popper uses the level geometry find an upper bound on subject-to-camera distance.
--
-- Hard limits are applied immediately and unconditionally. They are generally caused
-- when level geometry intersects with the near plane (with exceptions, see below).
--
-- Soft limits are only applied under certain conditions.
-- They are caused when level geometry occludes the subject without actually intersecting
-- with the near plane at the target distance.
--
-- Soft limits can be promoted to hard limits and hard limits can be demoted to soft limits.
-- We usually don"t want the latter to happen.
--
-- A soft limit will be promoted to a hard limit if an obstruction
-- lies between the current and target camera positions.
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local subjectRoot
local subjectPart

camera:GetPropertyChangedSignal("CameraSubject"):Connect(function()
	local subject = camera.CameraSubject
	if subject:IsA("Humanoid") then
		subjectPart = subject.RootPart
	elseif subject:IsA("BasePart") then
		subjectPart = subject
	else
		subjectPart = nil
	end
end)

local function canOcclude(part)
	-- Occluders must be:
	-- 1. Opaque
	-- 2. Interactable
	-- 3. Not in the same assembly as the subject

	return
		getTotalTransparency(part) < 0.25 and
		part.CanCollide and
		subjectRoot ~= (part:GetRootPart() or part) and
		not part:IsA("TrussPart")
end
