Converts a frame-local point and target height into a modifier point: the base-surface position
the world compares against and the elevation it flattens to. Identity on flat worlds; on planets
the tangent-plane point is projected onto the sphere and the local height turned into elevation.
Converts a frame-local point and target height into a modifier point: the base-surface position the world compares against and the elevation it flattens to. Identity on flat worlds; on planets the tangent-plane point is projected onto the sphere and the local height turned into elevation.