Blender Git Commit Log

New option "use signed distance" for force fields with "surface" shape.

By default a surface-based force will push things away from the surface
in both directions, regardless of whether a point is "inside" or
"outside" (judging by the surface normal). The new option makes a force
field always push things away in the direction of the normal, so that
it becomes less likely to get points "trapped" inside a mesh object.