Creating a Solid Model

4.The X, Y, A rotation angles (tilt) of the second surface of the element with respect to the first surface (i.e., these are local offsets with respect to item (2) above).

If you enter rotation angles, the surface/element is first rotated about the x-axis, then about the y-axis, and finally about the z-axis. Note that the first two rows in this dialog box are in global coordinates, while the last two rows are in local coordinates with respect to the first two rows. If the latter two rows have no offsets, then the offsets are as globally indicated for the first surface Center and Tilt.

FIGURE 2.11 - Insert Lens Element dialog box: Position tab

Aspheric tab

Using the Aspheric tab you set the rotationally symmetric aspheric coefficients for each surface. You select which surface to apply the aspheric coefficients to by

using a drop-down list. You can set the coefficients from ρ1 up to ρ29. See Equation 2.1 on page 2.9.

Each surface may have aspheric terms. The Aspheric tab uses a spreadsheet to enter the surface data. Ai corresponds to the ρi rows as shown in Figure 2.12.

2.12	TracePro 5.0 User’s Manual