minor edit: replaced methods taking a Vec3D to use ReadonlyVec3D for better compatibility
minor edit: replaced methods taking a Vec3D to use ReadonlyVec3D for better compatibility

--HG--
branch : toxiclibs

postspectacular/toxiclibs,postspectacular/toxiclibs,rekii/toxiclibs,rekii/toxiclibs,ruby-processing/toxiclibs