ViewportFrame issue

Help and Feedback Scripting Support
1

A friend and I are creating a viewport frame . Every model has a primary part but it still doesn’t work.

            local viewportcamera = Instance.new("Camera",script)
            viewportcamera.CameraType = Enum.CameraType.Scriptable
            local yintager = .4
            local xintager = 2
            local r = 0
            local item = workspace[Item]
            local viewportpoint = Vector3.new(0,0,0)
            local viewportframe = Clone.ViewportFrame
            viewportframe.BackgroundTransparency = 1
            print(item)
            viewportframe.CurrentCamera = viewportcamera
            item:SetPrimaryPartCFrame(CFrame.new(viewportpoint))
            item.Parent = viewportframe
            game:GetService("RunService").RenderStepped:Connect(function()
                
                local cfrane, size = item:GetBoundingBox()
                local max = math.max(size.X,size.Y,size.Z)
                local distance = (max/math.tan(math.rad(viewportcamera.FieldOfView))) * xintager
                local currentdistance = (max/2) + distance
                viewportcamera.CFrame = CFrame.Angles(0,math.rad(r),0) * CFrame.new(viewportpoint + Vector3.new(0,(currentdistance*yintager),currentdistance),viewportpoint)
                r += 1
                
            end)

Error:

 Model:SetPrimaryPartCFrame() failed because no PrimaryPart has been set, or the PrimaryPart no longer exists. Please set Model.PrimaryPart before using this.
2

The “item” model doesn’t appear to have it’s PrimaryPart property set. Thankfully, Roblox has recently introduced the “Pivot API”, so you can just replace the above line with

item:PivotTo(CFrame.new(viewportpoint))

And it should work just fine. What :PivotTo does is basically the same thing as :SetPrimaryPartCFrame, except it doesn’t need a primary part.

3

Thanks, it worked!

—Maximum character limit

4

Correct, PivotTo() uses the root part of a model instance instead, which is determined internally by the Roblox engine itself for all model instances (providing they contain at least a single BasePart instance).

1 Like
5

I believe the center is determined through something like :GetBoundingBox and the model’s pivot offset, not a part.