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# ─ 1.1. Geometry creation

Before starting with the geometrical models, it is recommended to work with the Units that fit the most to the dimensions of the geometry, as some parameters are automatically set-up. The following functions are especially sensitive to the working Units:

• Mouse functions: such as zoom and selection functions.  If any difficulty is found for these purposes, select the approximated elements on the desired area or from the Tree, click on Reset View button and the click on Zoom Selected button. Then, the camera functions are centered on the selection to improve the mouse functions near this region.
• Boolean operations: such as split or projection commands. It is recommended that the Units are similar to the smaller elements involved on boolean operations, as the accuracy may be improved.
• Meshing process: advanced meshing parameters such as the topology detection factors are predefined to the working Units.

In this example, the default Units (Meters )is valid.

First, to build a dihedral create two plane surfaces. It is available within the Geometry –Surface – Plane menu, Figure 1, or by using the plane command. As shown in Figure 2, the first corner of the first plane is (-0.5, -0.5, -0.5) and the first corner of the second plane is (-0.5, -0.5, 0). The second plane will be rotated 90º and move from (0, 0, 0) to (-0.5, 0, 0).

Figure 2: Dihedral.

Revise the normal vectors of the geometry by clicking on the Normals icon. The normal vectors must be as shown in Figure 3.

Figure 3: Normal vectors verification.

To build easily a trihedron creates a box of 1m x 1m with its first corner in (0, 0, 0). It is available within the Geometry –Solid – Box menu, Figure 4, or by using the box command. Rotate the box -45º around the z axis. Finally, explode the geometry by using the explode command and delete three surfaces by using the delete command. The geometry is shown in Figure 5.

Figure 5. Trihedron.

It is necessary to correct the normal vectors by clicking on the Normals icon and then choose the direction clicking on the geometry. Also, invertNormals command can be used to perform this task. The final result per each surface will be as shown in Figure 6.

Figure 6: Normal vectors.

To build a cavity creates a box of 1m x 1m with its first corner in (-0.5, -0.5, -0.5). Explode the geometry by using the explode command and delete one surface by using the delete command, as is shown in Figure 7.

Figure 7: Cavity

Be sure that the normal vectors are as shown in Figure 8:

Figure 8: Normal vectors verification.

In order to consider the reflections within the cube, it is necessary to duplicate the normals of the geometry. It is available within the Simulation –Duplicate Normals menu, as shown in Figure 9.

Figure 9: Duplicate normal vectors.

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