The first step to defining rays is to establish the starting positions and directions of the rays which is specified on the Positions / Directions tab of the Detailed Source dialog. The Positions / Directions page has been split into these two related but separate operations:
•Positions of the rays in the Source •Directions of the rays in the Source
The ray position and direction options are discussed below in the Controls section of this help topic. For the most part the ray positions are independent of the ray directions but there are some cases where ray directions are set by actions in the ray positions section. For example, in the case of user defined rays the ray positions and directions are defined at the same time in the ray positions section.
This feature can be accessed by selecting the Positions / Directions tab in a Detailed Source dialog box.
The following ray position specifications are available: Grid Plane (rectangular array of points arranged on a plane) Random Plane (random points arranged in a plane) Random Volume (random points arranged in a volume) Random String (random points arranged in a character or string) Random Surface (random points on the designated surface) Hexagonal Plane (hexagonal array of points arranged on a plane) Bitmap (points specified by bitmap pixels)
The following direction specifications are available: Directions to hexagonal gird points in angle space Directions to Rectilinear Grid Points Focus to/from two astigmatic foci Multiple source angles (plane waves) Randomly according to intensity distribution Random directions into a sphere Random directions into an angular range
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