local AssetService = game:GetService("AssetService")
local Workspace = game:GetService("Workspace")

-- 在空間中初始化可編輯網格
local editableMesh = nil
local success, errorMsg = pcall(function()
	editableMesh = AssetService:CreateEditableMeshAsync(Content.fromUri("rbxassetid://ASSET_ID"))
end)

local meshPart = nil
if success and editableMesh then
	meshPart = AssetService:CreateMeshPartAsync(
		Content.fromObject(editableMesh),
		{ CollisionFidelity = Enum.CollisionFidelity.Hull }
	)
	meshPart.Parent = Workspace
else
	warn(errorMsg)
end

-- 將從給定點發射光線的函數，返回命中的世界點和UV座標
local function castRayFromCamera(meshPart: MeshPart, editableMesh: EditableMesh, viewportPoint: Vector3)
	if not meshPart then
		return
	end

	-- 計算 物件在每個維度上被縮放的程度
	local renderScale = meshPart.Size / meshPart.MeshSize

	-- 創建從相機到被點擊點方向的光線
	local ray = Workspace.CurrentCamera:ViewportPointToRay(viewportPoint.X, viewportPoint.Y)

	-- 轉換為物件空間以用於RaycastLocal()
	local relativeOrigin = meshPart.CFrame:PointToObjectSpace(ray.Origin) / renderScale
	local relativeTarget = meshPart.CFrame:PointToObjectSpace(ray.Origin + ray.Direction * 100) / renderScale
	local relativeDirection = relativeTarget - relativeOrigin

	local faceId, point, barycentricCoordinate, vertId1, vertId2, vertId3 =
		editableMesh:RaycastLocal(relativeOrigin, relativeDirection)

	if not faceId then
		-- 沒有擊中任何面
		return
	end

	-- 計算在世界空間中的命中點
	local worldHitPoint = meshPart.CFrame:PointToWorldSpace(point * renderScale)

	-- 獲取面的UV
	local uvId1 = editableMesh:GetVertexFaceUV(vertId1, faceId)
	local uvId2 = editableMesh:GetVertexFaceUV(vertId2, faceId)
	local uvId3 = editableMesh:GetVertexFaceUV(vertId3, faceId)

	local uv1 = editableMesh:GetUV(uvId1)
	local uv2 = editableMesh:GetUV(uvId2)
	local uv3 = editableMesh:GetUV(uvId3)

	-- 根據重心坐標在面內插值UV
	local u = (barycentricCoordinate.x * uv1.x) + (barycentricCoordinate.y * uv2.x) + (barycentricCoordinate.z * uv3.x)
	local v = (barycentricCoordinate.x * uv1.y) + (barycentricCoordinate.y * uv2.y) + (barycentricCoordinate.z * uv3.y)

	return worldHitPoint, Vector2.new(u, v)
end