Feather, falloff, grow/shrink/close/open and their amount, on the selected
layer. All four read the one distance field, so all four are live — nothing
recomputes except a compound morphology, and the session keys on that
separately so a feather drag rebuilds nothing.
Shown only for sources that go through the distance field. A gradient
carries its own falloff in its geometry, and offering a second one would be
two controls fighting over the same edge.
Picking an operation seeds a small amount if none is set. Selecting "Grow"
and seeing nothing happen would read as a broken control rather than as a
radius of zero.
dtourolle
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