Traces all rays and renders them in the Visualization window. This command is unavailable until the rays have been created with the Create Sources command. If any raytrace paths exist at the start of this raytrace call, they will be automatically deleted.
This feature can be accessed in the following ways: •Menu > Raytrace > Trace Existing and Render •Ctrl + Shift + F11 •Toolbar button:
Manipulating the system view (i.e., pan or rotate) in the Visualization window while the rays are being rendered can lead to spurious effects, particularly if a large number of rays have been selected. For best results, wait to change the view until the raytrace has completed, as indicated by the status bar at the bottom of the FRED program window.
The number of rendered rays can be different than the number of rays defined by the source. Go to the Source dialog, select the Visualization tab, and enter the number of sources rays per rendered ray using the "Draw every nth ray" option.
If a source contains multiple wavelengths, FRED automatically creates and renders the number of rays specified in the Positions/Directions tab for each wavelength.
The color of the rendered rays is specified under the Wavelengths tab of the Source dialog. The rendered color can be calculated to approximately match the wavelength. It may be different from the color of the ray starting positions (which is useful if multiple wavelengths have been assigned to a single source).
Ray colors can also be modified during the raytrace. They can be made dimmer (i.e., blacker) as they lose power. They can also be made to change color after intersecting a surface.
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