Region3 not generating properly?

Hi. The title is pretty self explanatory. Here's my code:

local burnRegion = Region3.new(workspace.Point1.Position, workspace.Point2.Position)

local visual = Instance.new("Part")
visual.Parent = workspace
visual.Anchored = true
visual.Size = burnRegion.Size
visual.CFrame = burnRegion.CFrame
visual.Transparency = 0.5
visual.CanCollide = false
visual.Name = ("thingy")