### 25.2.1. Coordinate Frame: Option

#### 25.2.1.1. Point and Normal

This method can be used to make Cartesian coordinate frames. The origin of the coordinate frame is set to the centroid of a specified 2D region (which is available only when a mesh exists). Axis 3 of the coordinate frame is then computed as locally normal to the 2D region; its direction can be reversed if not satisfactory (after examining the coordinate frame representation in the viewer). Optionally, Axis 1 may be given a prescribed orientation about Axis 3 by specifying a point that is interpreted as lying on the 1-3 plane with a positive Axis 1 coordinate. If such a point is not specified explicitly, the global origin is used. Axis 2 is found by the right-hand rule.

#### 25.2.1.2. Axis Points

This method can be used to make Cartesian coordinate frames. The coordinate frame is created by specifying three points. It is important to understand how these three points are used to create a coordinate frame. For details, see Coordinate Frame Details in the CFD-Post User's Guide.

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