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This is just one example of how to set up a Planar Tracker and Paint node. In some instances,
you made need to do more work with masks and layering, but the above example gives you a
good starting point.
Painting a Clean Plate
On simple clips, planar tracking the clone paint strokes may work fine. In other cases, you may
not be able to steady the clip, or the strokes might appear like they are “bubbling.” Paint is just a
single stroke repeated over multiple frames. Each painted frame has the potential to appear
differently than the one before or after. Often, the more reliable way to use paint is by creating
what is referred to as a “clean plate.” Create one good painted frame and freeze it. Then use the
Planar Tracker to track the cleaned area over the top of the original. The benefit is that there is
only a single paint stroke instead of repeated paint strokes that potentially show unwanted
artifacts. For this next example, we continue with the previous clip, but now the technique is to
freeze, mask, and composite just a single frame of the fixed forehead over the original clip.
Creating a Freeze Frame and Clean Plate
As in the previous example, you still track the clip using the Planar Tracker. After tracking, you
can branch out from the MediaIn (or Loader node if you are using Fusion Studio) into a Time
Stretcher to create the freeze frame.
Time Remap is used to retime or freeze a clip.
Disable the default Keyframe in the Time Stretcher and enter the frame you want to freeze. If
you have already performed a Planar Track, then entering the frame you set as the Reference
Frame is usually a good frame to freeze.
To create the clean plate, you connect the paint node to the output of the Time Stretcher. Clone
over the areas you want to hide, and you now have a single clean frame. Now you need to
composite the clean area over the original.
Isolating the Painted Forehead
First, we need to mask out just the man’s painted forehead. We can do this by connecting a
MatteControl node to the output of the Paint node and then connect a Polygon node to the
garbage matte input. This lets us draw a shape with the Polygon node and use it as a mask to
crop out the man’s painted forehead.
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