How to Mask Paint Node with Foreground Object in Fusion?

This has been an absolute nightmare.

I have a shot of a hand falling down into a pool of water, but you can see the water tub reflection in the shot before the hand falls down to cover it up. Basically I want to paint out the circled area in red, and then have the hand cover up the paint as it falls into the pool of water.

There are many ways to do it, but you can simple limit the duration of the strokes so they are not used when the hand covers the area or you can rotoscop either the arm the reflection and use it as occlusion mask.

In the paint node "clone" and "multi-stroke" clones are single frame paint strokes where you can set duration in frames where they duplicate themselves. The "Stroke" preset is sampling each stroke, but you can make each paint stroke editable and or change duration or you can select them and covert to a group and make group.

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Or you can simply trim the strokes or whole paint group if you make one, in the keyframe editor

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To begin working with the Paint tool, first select the paint stroke type from the Paint toolbar above the viewer. There are ten stroke types to choose from as well as two additional tools for selecting and grouping paint strokes. The stroke types and tools are described below in the order they appear in the toolbar.




Multistroke: Although this is the default selection and the first actual brush type in the toolbar, Multistroke is not typically the stroke type most often used. However, it’s perfect for those
100-strokes-per-frame retouching paint jobs like removing tracking markers. Multistroke is much faster than the Stroke type but is not editable after it is created. By default, Multistroke lasts for one frame and cannot be modified after it has been painted. Use the Duration setting in the Stroke controls to set the number of frames before painting. A shaded area of the Multistroke duration is visible but not editable in the Keyframes Editor. While Multistrokes aren’t directly editable, they can be grouped with the PaintGroup modifier, then tracked, moved, and rotated by animating the PaintGroup instead.


Clone Multistroke: Similar to Multistroke but specifically meant to clone elements from one
area or image to the other. Perfect for those 100-strokes-per-frame retouching paint jobs like removing tracking markers. Clone Multistroke is faster than the Stroke type but is not editable after it is created. By default, Clone Multistroke lasts for one frame and cannot be modified after it has been painted. Use the Duration setting in the Stroke controls to set the number of frames before painting. A shaded area of the Clone Multistroke duration is visible but not editable in the Keyframes Editor.


Stroke: In most cases, the Stroke tool is what people think of when they think of paint and is
the tool of choice for most operations. It is a fully animatable and editable vector-based paint stroke. It can become slow if hundreds of strokes are used in an image; when creating a lot of paint strokes, it is better to use Multistroke. The Stroke type has a duration of the entire global range. However, you can edit its duration at any time in the Keyframes Editor. When the painting is complete, choose the Select button in the Paint toolbar to avoid accidentally adding new strokes.

If I was doing this shot I would concentrate in cleaning it up first and at the end I would rotoscope the hands on top of the painted area.

This ^ but also do any of the following:
- clone from areas which don't intersect with hand;
- clone from frame ranges that don't have hands;
- clone from other sources that don't have hands (other takes etc)