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In Detect3D, rays are cast from each flame detector to calculate the obstructed field-of-view.
An initial set of rays are cast at a certain Angular Resolution. If obstructions are detected by this initial ray set, additional rays are fired between the initial set to improve accuracy in determining edges of obstructions. Further sets of rays can be cast in between the existing rays. The number of times this process is repeated is known as the number of Adaptive Refinements.
Users have control over both the angular resolution and the number of adaptive refinements defining each flame detector's field-of-view.
If you are unfamiliar with the resolution and refinement capabilities of Detect3D and how they are defined, please go over this section before continuing.
As an example, a 1 degree angular resolution with 1 adaptive refinement (1deg/1ref) will result in an accuracy of 0.5 degrees, since rays will be fired half-way between the initial set during the adaptive refinement stage of the calculation. Similarly, a 2 degree resolution with 2 refinements (2deg/2ref) also has a 0.5 degree accuracy, but the results may not be the same as the 1deg/1ref case because the angular resolution is coarser and may miss important obstructions that could be between the initial set of rays.
It would be good practice to perform initial calculations with coarse (2deg/0ref) resolution. Once adequate locations have been determined, then increase the resolution for final analysis and reporting.
For more information about how geometry may be "missed" by the initial ray set as well as a more detailed explanation of how resolutions and refinements are different, refer to the Resolution vs. Refinement section.