RC Surface.Extend directions

image

https://developer.rhino3d.com/api/RhinoCommon/html/M_Rhino_Geometry_Surface_Extend.htm

For directions to extend, we have the IsoStatus enumeration:

https://developer.rhino3d.com/api/RhinoCommon/html/T_Rhino_Geometry_IsoStatus.htm

Just wanted to confirm -

  • East is always the edge along the V direction at the positive end of the U domain
  • West is always the edge along the V direction at the negative end of U domain
  • North is always the edge along the U direction at the positive end of V domain
  • South is always the edge along the U direction at the negative end of V domain

Did I get that right? Is it always consistent?