function norm {
    parameter p0 is v(0,0,0).
    set u to (p0-body:position):normalized.
    set p1 to vxcl(u,facing:vector):normalized * (bnds:size:mag + 5).
    set g2 to body:geopositionof(angleaxis(120, u) * p1 + p0). set p2 to choose g2:position if g2:terrainheight > 0 else g2:altitudeposition(0).
    set g3 to body:geopositionof(angleaxis(-120, u) * p1 + p0). set p3 to choose g3:position if g3:terrainheight > 0 else g3:altitudeposition(0).
    set g1 to body:geopositionof(p1 + p0). set p1 to choose g1:position if g1:terrainheight > 0 else g1:altitudeposition(0).
    return vcrs(p1-p2,p1-p3):normalized.
}