VERTEX offers various ways to use a masking tool - one of them is the generative mask.
Masking effects are an efficient way to single out a particular area of your video texture that you want to reveal, hide or modify in other ways.
How To Create A Mask
Either go to MAIN MENU > CREATE > Content > Mask
or
right-click on Project Explorer > Content and select Mask from the Add Content context menu.
How To Apply And Edit A Mask
1.Drag your new mask from Project Explorer to Playback Editor and drop it on a track in your timeline above the composition you would like to mask.
2.The Render Editor switches automatically to the editing tools for your new mask modifier. Here you can edit your mask by adding/ deleting points to the outline.
3.For a gradual transition between foreground and background, go to the Inspector and set your desired Softness level. Here you can pick colors for your mask or invert foreground and background.
Masking Tools Within A Clip Container
At times it can be convenient to store a mask within a particular Clip Container. Not only a generative mask but pretty much any visual content can be added to a Clip Container as a mask:
1.Inspect the Clip Container you would like to add a mask to and go to the Mask tab.
2.Drag your mask content from the Project Explorer and drop it into the Content field of the Inspector's Mask tab. Set the desired mix level, modes, scaling and position.