The Best Geometric Focus analysis reports the position at which rays come to the smallest 3-dimensional focus, with the user having the ability to select the coordinate system in which the data is reported. Additionally, the analysis reports the equivalent f/#, numerical aperture, max angular spread, and average ray direction. This analysis relies solely on geometric ray trajectories and will not locate the best focus when considering wavefronts.
This command can be accessed in the following ways: •Menu > Analysis > Best Geometric Focus •Shift + F9 •Toolbar button:
Each ray meeting the ray filter criterion has a closest approach distance to the best focus point. The best focus point is calculated by minimizing the RMS of the closest approach for the trajectories of all the rays selected. The trajectories for these rays ignore any surfaces that may or may not be in the path of the trajectory between the ray’s current position and the best focus point.
The collection of each ray’s point of closest approach to the best focus point defines a volume in space, which can be approximated to first order with an ellipsoid. The best focus command calculates and reports an RMS radius for the three axes of this ellipsoid and the principle directions of the axes (the ellipsoid is not necessarily aligned with the coordinate system chosen for the results).
Position / Orientation Operations
|
|||||||||||||||||||||||||||||||||
