Blackmagic Forum

Hi guys so i was trying to mask a door but the footage had some slight movement so i tried to track a small part of the door to have the data and roto the whole door so i can try to do more work in less time


it almost worked but i got stucked half way

i have some screenshots of my Composition

Please and thank you to anyone who lends a hand

At what point did you get stuck? It's not quite clear from your post.

now that i had the tracker and the roto i failed to make the roto follow the trackig path


What did i do wrong??

Please and thank you once again

So do you want to remove the door behind the actor? Or what is it you're trying to do?

Hi Sanders

Im trying to roto the door because it has a green screen at the side and the door is green

so it kinda takes the edge of the door a little bit but the chroma mistake can be seen.


Also i tried to only select the chroma part but since the footage has movement i can't make a precise masking so i always get some part of the door...im trying to do my best

Can you share the moving footage so we can see what you're doing?

Depending on the kind of movement it shouldn't be too difficult to do what you want to do.
It just appears that you're using too many steps to achieve this. As soon as you track all the data is already available. There is no need to publish stuff, since the fact that you tracked the footage has provided you with published data already. You can just connect the mask to the tracker and then create your mask and you should be good to go.

also the guy in this tutorial uses a script

but when i do the same steps i can't see the same options

i try to do something similar since the "tracker path" is on the "connect to" option

The link doesn't work for me. Does it work for you?

yes it works for me

write in youtube: Fusion Tutorial Rotoscoping Simple Shapes by Traking

Is this the one?



It's not a very good workflow actually, that is shown in that video. There is no need to duplicate the loader in Fusion and it's very uncommon to mask a loader directly. If you can share *your* footage that would be more helpful, since I/we can be more specific helping you out.

i'll try to post it here as soon as i have the chance

Can you please tell me your email so i can send it to you

the thing is that the forum won't let me upload it

only 2MB for upload and no .mp4

thanks man

Hi Edwin,

Before I go into tracking the mask(which is a good way to go in some cases)
have you tried the following?

Yes, you have greenscreen, but it's not a very good color green. There is also lots of red and blue in there, so it's difficult to key. But it is very evenly lit. I've used a wand mask inside of the door and got the following result in less than two minutes. I'm sure that with a little tweaking it will be better, but especially with a shot this short, you'd probably get away with it, no problem.

Code: Select all

{
   Tools = ordered() {
      Wand1 = WandMask {
         Inputs = {
            SoftEdge = Input { Value = 0.00170212765957447, },
            MaskWidth = Input { Value = 1920, },
            MaskHeight = Input { Value = 1080, },
            PixelAspect = Input { Value = { 1, 1 }, },
            ClippingMode = Input { Value = FuID { "None" }, },
            Source = Input {
               SourceOp = "Loader1",
               Source = "Output",
            },
            SelectionPoint = Input { Value = { 0.162444113263785, 0.26953642384106 }, },
            Range = Input { Value = 0.45531914893617, },
         },
         ViewInfo = OperatorInfo { Pos = { -368, -111 } },
      },
      Loader1 = Loader {
         Clips = {
            Clip {
               ID = "Clip1",
               Filename = "F:\\Downloads\\VFXchallenge\\original footage.mp4",
               FormatID = "QuickTimeMovies",
               Length = 39,
               Multiframe = true,
               TrimIn = 0,
               TrimOut = 38,
               ExtendFirst = 0,
               ExtendLast = 0,
               Loop = 1,
               AspectMode = 0,
               Depth = 0,
               TimeCode = 0,
               GlobalStart = 0,
               GlobalEnd = 38
            }
         },
         Inputs = {
            ["Gamut.SLogVersion"] = Input { Value = FuID { "SLog2" }, },
         },
         ViewInfo = OperatorInfo { Pos = { -491, -83 } },
      },
      MatteControl1 = MatteControl {
         Inputs = {
            MultiplyGarbageMatte = Input { Value = 0, },
            Background = Input {
               SourceOp = "Loader1",
               Source = "Output",
            },
            GarbageMatte = Input {
               SourceOp = "Wand1",
               Source = "Mask",
            }
         },
         ViewInfo = OperatorInfo { Pos = { -263, -59 } },
      },
      MatteControl2 = MatteControl {
         CtrlWZoom = false,
         Inputs = {
            MatteBlur = Input { Value = 0.25, },
            MatteContractExpand = Input { Value = -0.182978723404255, },
            PostMultiplyImage = Input { Value = 1, },
            Background = Input {
               SourceOp = "MatteControl1",
               Source = "Output",
            },
         },
         ViewInfo = OperatorInfo { Pos = { -105, -59 } },
      }
   },
   ActiveTool = "MatteControl2"
}

Thanks a lot Sander's

I will try it once i get home

thank you very much

Hi sanders it did work and i will used it often

But i still ask?
How can i do the mask and tracking work
Just for future proyects

Im trying it out myself but i always ALWAYS fail miserably i don't know what the heck am i doing wrong?

Please help me
And thank you very very much

Hi Edwin,

I've created a tutorial to help you (and others) out with this subject. The tutorial can be found here:

viewtopic.php?f=22&t=56956

and I've embedded it here as well

Your roto is plugged into the wrong input of the Tracker. Use the green input for the pixels you want the Tracker to move around. Then plug the output of the Tracker into the EffectMask input of whatever you want to mask.

You won't be able to plug the roto into both the Foreground of the Tracker and the mask input of the Footage if you have the Footage connected to the Background of the Tracker. That would create a feedback loop, and Fusion won't allow it.

Sander and Bryan

Thank you thank you so so much for the tutorial and the tracker aclaration this is gonna helped me a lot. Both of your references are great.

Also to everyone else thank you for all of your suggestions

Have a nice day