On this page you can download free 3D model of a Celtic knot which is intended to decorate rectangular surface areas.

This simple 3D decoration in the shape of a Celtic knot has been modeled on the basis of the pattern found at this link: Celtic knot 2D design

 

Celtic 3D knot
3D model category
3D CAD software used for modeling

Rhino 3D

Available NURBS and BREP file formats

.stp (Standardized 3D graphic exchange file format) and .3dm (Rhinoceros software native file format)

Available polygonal mesh file formats

.stl

Geometry: Mesh - Triangles only; Vertices: 7849; Edges: 23643; Faces: 15762;

 

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;
Importing 2D pattern

 

- Drawing and scaling of cross sections which can be of various shapes, as shown in the picture;


 
Drawing and scaling cross sections

 

- 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;


Copying appropriate cross sections

 

- Connecting cross sections by SWEEP command, resulting in a 3D surface model of the Celtic knot;
 
Connecting cross sections by SWEEP command

 

- Through trimming and joining of individual surfaces, a closed polysurface is obtained out of which a solid model is created.
Trimming and joining of individual surfaces

 

Download 3D model (BREP and NURBS)
Download 3D model (polygonal mesh)