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Description
The Random Directions into an Angular Range option generates a user defined number of Rays with random directions in an angular range at each of the ray positions defined in the Positions sections (in the top half of the page). The Local X direction cosine specifications allow clocking of the source directions without rotation of the source plane.
Navigation
This feature can be accessed by selecting Random directions into an angular range as the ray direction type on the Positions/Directions tab of a detailed source dialog box.
Controls
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Control
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Inputs / Description
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Defaults
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Ray Directions
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Type
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Drop down menu of ray direction types. Select Random Directions into an angular range.
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Single Direction (plane wave)
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Parameters
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Num Rays
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Number of rays generated at each ray position.
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1
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X Outer Semi-Ape
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X Semi-angle of the cone of ray directions generated randomly.
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90
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Y Outer Semi-Ape
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Y Semi-angle of the cone of ray directions generated randomly.
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90
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X Hole Semi-Ape
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X Semi-angle of hole in ray cone.
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0
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Y Hole Semi-Ape
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Y Semi-angle of hole in ray cone.
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0
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Type
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There are two options for angular distribution of the rays.
•Lambertian - distributed evenly in direction cosine space
•Isotropic - distributed evenly in angle space
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Lambertian
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Shape
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Angular spread cross sectional shape can set as Elliptical or Rectangular.
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Elliptical
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X Dir Component
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X component of the direction cosines defining the forward direction of the cone of rays.
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0
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Y Dir Component
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Y component of the direction cosines defining the forward direction of the cone of rays.
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0
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Z Dir Component
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Z component of the direction cosines defining the forward direction of the cone of rays.
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1
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X Local X
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X direction cosine component of the source clocking relative to the local X axis, i.e. the rotation of the source in the plane of the source. Note that this plane is perpendicular forward direction of the cone of rays.
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1
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Y Local X
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Y direction cosine component of the source clocking relative to the local X axis, i.e. the rotation of the source in the plane of the source. Note that this plane is perpendicular forward direction of the cone of rays.
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0
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Z Local X
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Z direction cosine component of the source clocking relative to the local X axis, i.e. the rotation of the source in the plane of the source. Note that this plane is perpendicular forward direction of the cone of rays.
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0
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OK
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Accept settings and close dialog box.
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Cancel
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Discard settings and close dialog box.
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Help
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Access this Help page.
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Application Notes
Multiple wavelengths from list
When tracing a source using the wavelengths list, one ray of each wavelength will be traced at each of the randomly generated angles.
Related Topics
Ray Directions - Focus to / from two astigmatic focii
Ray Directions - Astigmatic Gaussian beam
Ray Directions - Focus to / from a point
Ray Directions - Multiple source angles (plane waves)
Ray Directions - Multiple source positions
Ray Directions - Random directions into a sphere
Ray Directions - Single direction (plane wave)
Ray Directions - Directions to hexagonal grid points in angle space
Ray Directions - Randomly according to intensity distribution
Ray Directions - M Squared Laser Beam
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Copyright © Photon Engineering, LLC
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