# KU Card

This card creates a mesh of surface triangles in the shape of a spherical section.

On the Construct tab, in the Surfaces group, click the Sphere (KU) icon.

## Parameters:

- S1
- The centre of the sphere.
- S2
- A point that indicates the $\vartheta =0\xb0$ direction in a spherical coordinate system. The distance between S1 and S2 is the radius of the sphere.
- S3
- A point that indicates the $\vartheta =90\xb0$ , $\phi =0\xb0$ direction in a spherical coordinate system. The distance S1–S3 must be equal to the distance S1–S2.
- Normal direction
- The triangles can be created so that the normal vectors point Outward (away from the centre of the sphere) or Inward (towards it).
- Begin angle ${\vartheta}_{a}$ (degrees)
- The start angle ${\vartheta}_{a}$ in degrees of the spherical segment.
- Begin angle ${\phi}_{a}$ (degrees)
- The start angle ${\phi}_{a}$ in degrees of the spherical segment.
- End angle ${\vartheta}_{e}$ (degrees)
- The end angle ${\vartheta}_{e}$ in degrees of the spherical segment.
- End angle ${\phi}_{e}$ (degrees)
- The end angle ${\phi}_{e}$ in degrees of the spherical segment.
- Maximum edge length (bottom)
- The maximum length of the triangles along the curved edges in m (is scaled by the SF card). If this parameter is left empty, the value specified with the IP card is used.

A complete sphere may be created with ${\vartheta}_{a}={\phi}_{a}=0$ , ${\vartheta}_{e}=180\xb0$ and ${\phi}_{e}=360\xb0$ .

## An example of KU card usage:

The spherical segment is generated using the KU card.