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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Tw9?U,]
units, a luminous intensity plot is in units of candelas (lumens per steradian). In mbO.Kyfen
radiometric units, an intensity plot is in units of watts per steradian. Candela plots UQ+!P<>w
are commonly used in the design of illumination systems, especially those used in oF(|NS^
the far field. E% \Ohs7
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface rFYw6&;vOi
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” a & tl@y1
the model and “go off to infinity.” Exiting rays are the collection of ray segments -Sj|Y }
following the intersection point of a ray at a surface. Due to ray splitting, several -{S: sK.o
ray segments may contribute to the candela data for each incident ray. Incident T3^(I~03
rays are the collection of ray segments which intersect the selected surface. No 3[iHe+U(
surface selection is required for Missed rays but one is necessary for Exiting and Z=>#|pW,)
Incident rays. i^&^e g'.5
The candela plots represent flux versus angle and can be smoothed using the Z66q0wR7
Candela Options dialog box. The iso-candela plots can be presented as false 4'0rgS
color maps or contour plots. The distribution plots are graphs of cross-sectional psE&Rx3)
curves through the candela distribution. F]^ZdJ2
The orientation of the candela plots is determined by the Normal Vector and the NEX{vZkgw
Up Vector, as specified in the Analysis|Candela Options dialog box. The 3X}>_tj
normal vector specifies the axis of the candela plot and the up vector specifies M `.v/UQn
“which way is up.”
