To obtain a 3D models out of the Celtic knot 2D patterns is simple, although the very modeling process is time-consuming as it requires the repetition of a large number of identical operations.
The 3D modeling process:
- Importing 2D pattern;
- Drawing and scaling of cross sections which can be of various shapes, as shown in the picture;
- Copying appropriate cross sections in the plane that lie normally in relation to the plane where the 2D pattern is found and in relation to the curve at the point where the plane is drawn;
- Connecting cross sections by SWEEP command, resulting in a 3D surface model of the Celtic knot;
- Through trimming and joining of individual surfaces, a closed polysurface is obtained out of which a solid model is created.