LwCad contains a complete snap engine that is fully integrated into all LwCad tools. Snap modes are adjustable using the “Snapping” panel which is part of each Numeric Panel.
Ucs & Snap panel in Cinema 4D:
UCS allows you to create a user-defined adjustable work-plane.
There are three basic modes:
Off - UCS is disabled
Auto - automatic mode, work-plane created after first mouse click, working on edges, polygons and flat NURBS surfaces. Auto-UCS on NURBS surfaces is not supported yet.
Fix - fixed mode, work-plane is fixed
Ruler option allows to display the UCS coordinates in the viewport
Auto Corner option defines the corner point of the surface that is used to create work-plane in Auto UCS mode.
Grid option defines the value of the grid in the work-plane. Grid snapping works only with active UCS.
Angle snapping only works with certain types of tools and handles.
Angle snap value can be set to 90º, 45º, 30º, 10º or a user defined value.
Angle snapping can be enabled-disabled while holding CTRL key while dragging the handle in the viewport.
Surf - snapping to the nearest surface
Edg - snapping to the nearest surface edges
Pnt - snapping to the nearest surface points
Perp - snapping to the nearest perpendicular edges
Tan - snapping to the nearest tangent edges. (reserved for NURBS)
Int - snapping to the intersections between edges
Cent - snapping to the center of the nearest surface or edge.
Rul: - snapping to the ruler which is placed on the nearest edge.
Rul Count - division count of the ruler.