Through the Pore / Matrix Material (ID 00) button, select the material which occupies the space surrounding the threads (e.g. Air) from the GeoDict Material Database (see also the Material Database User Guide). The surrounding material always has Material ID 00.

The values in Unit Cells in X/Weft-Direction and Unit Cells in Y/Warp-Direction set the number of repetitions of the generated unit cell. If a GeoDict simulation with periodic boundary conditions will be performed on the structure later on, one unit cell is sufficient. It is also possible to activate and enter a X/Weft Stretch Factor and a Y/Warp Stretch Factor respectively, which should be close to 1. If the Stretch Factor is enabled, the simulation is done in two passes. First a simulation without this option is done, then a stretching is done and the final position of the threads is determined. If the X/Weft Stretch Factor is e.g. 1.05, the domain is enlarged by 5% in X-Direction before the second pass of simulation. In the second pass the threads are tightened to reach again their initial length. In the Result File a table shows the remaining error of this process.

Voxel Length, Inlet, and Outlet are as explained for the plain weave Domain tab, Crimp Factor, Vertical Thread Overlap and Random Seed are as explained for the plain weave Weave Shape tab.

For the Weft-Layer System (as well as for the Warp-Layer System), any number of layers can be defined. The layer with the lowest number is the bottom layer. Layers are added by Add Layer and are stacked on top (in Z+ direction). Delete the topmost layer by clicking Remove Layer. The parameters of each layer can be edited by double clicking on a value.

The Density is the ratio between the Yarn Counts (i.e. the number of threads) in the different layers. It must be a positive whole number.

The Yarn Count is the absolute number of yarns in the unit cell and is defined in Layer 1. The Yarn Counts in the subsequent layers are defined by the Density values. Therefore, the Yarn Count for Layer 1 must be divisible by the Density for Layer 1. The number of threads in a layer can later be adapted by hiding threads.

Example:

Layer 1 consists of 4 yarns and Layer 2 contains 8 yarns:

Layer 1 consists of 4 yarns and Layer 2 contains 2 yarns:

The Pick Count is the number of Yarns per cm and the Pitch is the distance between the midpoints of two adjacent yarns. The Pitch is the reciprocal value of the Pick Count. When one of those two values is changed in the user interface, the other one is updated automatically.

The values for the Unit Cell Size are not editable since they depend on the definition of the parameters of the structure. For example, the thread widths and pitches and the chosen number of unit cells determine the width and height of the weave.

The Unit Cell Size is displayed as the number of voxels (Unit Cell Voxels) in X Direction, Y Direction and Z Direction (approximated) and the corresponding Unit Cell Length is shown in the chosen unit. The weave generation in FreeWeave is based on an iterative solver, therefore the number of voxels in Z Direction can only be approximated here.

In the third column, the Discretization Error is shown. It is the length difference between the defined weave and the voxelized (discretized) weave and can be minimized by adjusting the Voxel Length.