Geometry by Edges

Definition of confined space

The volume is described by its edges.

The coordinates of the volume’s vertices are defined and provided with a node number.

Example on geometry with node numbers.

Each edge is defined by means of two node numbers.

The b4cast software does automatically make the polygons which define a confined space.

Edges must be specified to such an extent that all polygons become plane.

To check the consistency of the input data it is necessary to indicate the coordinates of a point which is expected clearly inside the volume.

Note! If the Edge Model is overly complex (e.g., originating from a detailed STL file), the algorithm may be challenged.

The Edge Geometry can be copied to a Surface Model if you prefer to work with surfaces instead of edges.

The coordinates of the vertices are defined in the local (r,s,t)-coordinate system. The positioning of the volume in the global (x,y,z)-coordinate system is described in EditVolume.

Caution!

Polygons enclosing other polygons or holes must be divided so that the individual polygon does not enclose anything. That means that the red surface in the figure below must be considered as 2 polygons (e.g., A and B) as shown in the lower figure. This is done by adding the 2 “edges” marked in red.