Ray Directions - Focus to / from a point

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Focus to/from a Point

Page Contents

Description

For each starting ray position, this specification orients the ray direction such that it passes through (or away from) the specified (x,y,z) point. This specification is commonly used in combination with the ray position specification types Grid Plane, Random Plane, or Hexagonal Plane, in order to define ray positions within an aperture whose ray directions are coming to/from a focus point.

Navigation

This feature can be accessed by selecting Focus to / from a point as the ray direction type on the Positions/Directions tab of a detailed source dialog box.

Controls

Control	Inputs / Description	Defaults
Ray Directions
Type	Drop down menu of ray direction types. Select Focus to/from a point.	Single Direction (plane wave)
Parameters
Direction	Specifies whether the ray direction is propagating toward the specified point or away from the specified point	Toward Point
Position	Specifies the x,y,z position of the point in the local coordinate system of the source.	0, 0, 1

OK	Accept settings and close dialog box.
Cancel	Discard settings and close dialog box.
Help	Access this Help page.