The Method pull down list lets you specify the particular TFI method to apply to domains when the Initialize button is pressed. Blocks will always be intialized using the Standard method. On the other hand, the choices when initializing domains are the following:
Press Begin to expand the Polar Axis Selection frame. As shown below, there are three methods for defining the axis: Curve, 2 Points, and Point and Direction.
The default Curve option expects you to pick a curve in the Display window or in the List to use as the axis. If the curve is not linear, the endpoints will be used to define the axis. The 2 Points option allows you to pick points in the Display window or enter them directly into the XYZ text field. Point and Direction allows you to pick or enter a point and then select a primary axis direction through that point or specify a non-primary axis direction by entering directly into the Vector text field.
Delete Last Point allows you to delete selected or entered points when using either the 2 Points or Point and Direction axis specification options. Clear Axis allows you to start the axis specification process over from the beginning by clearing the currently defined axis. Press End to confirm your change and the information in the Current Axis table will be updated accordingly.
The (x,y,z) grid point coordinates on the boundaries are then transformed to polar coordinates (r, alpha, z') relative to the axis of revolution. The TFI algorithm is applied to each of the polar coordinates. Finally, the polar coordinates are transformed back to Cartesian coordinates. Polar is not available for blocks.
If the grid passes the two tests above, then the grid's boundary points are projected (using closest point) onto each of the candidate (according to condition 2 above) database surfaces. The projection that results in the smallest cumulative movement of the boundary points determines the database entity to use for Parametric TFI. The grid's boundary points are projected onto the entity, and the resulting (u,v) coordinates are used to drive Parametric TFI. Note that the projection of boundary points is only a temporary operation; the original coordinates of the boundary points are restored.
Parametric Fit TFI is the second method after Parametric TFI that Pointwise tries to apply by default to create the initial surface grid for domains. For Parametric Fit TFI to be applied automatically to a new domain, a third condition must be satisfied: