Orrery › Terrain › Tool › Brush

The splat SetSplatBrush set; empty when none.

Set the mask base angle, degrees from +X toward +Y; the rotation mode adds to it.

Make a baked brush asset the tool brush: register its mask with the terrain, name it in the brush, take the asset's default angle, radius and aspect, and switch to Spacing steps (a patterned mask is laid evenly).

Set how each dab turns the mask.

Lay dabs by distance: one each time the pointer has moved Fraction of the radius.

Make a baked splat asset the tool's splat: register its channel masks with the terrain, keep the splat for SplatAt and for drags (the sculpt component lays it at every stroke step), and take the asset's default angle and radius.

Lay the splat once at a place, as a one-dab stroke (one undo): up to four masked Paint steps, red to alpha.

Stamp the brush once at a place, as a one-dab stroke (one undo).