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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 3uYLA4[-B
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Fu.aV876\f
radiometric units, an intensity plot is in units of watts per steradian. Candela plots _\>y[e["p
are commonly used in the design of illumination systems, especially those used in C@Wzg
the far field. 5.^pD9 [mT
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface [h-6;.e
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” + nR("Il
the model and “go off to infinity.” Exiting rays are the collection of ray segments jnqp"
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following the intersection point of a ray at a surface. Due to ray splitting, several :=Zd)i)3
ray segments may contribute to the candela data for each incident ray. Incident P8c_GEna
rays are the collection of ray segments which intersect the selected surface. No ~k34#j:J65
surface selection is required for Missed rays but one is necessary for Exiting and uL)MbM]
Incident rays. [6TI_U ~
The candela plots represent flux versus angle and can be smoothed using the tEL;,1
Candela Options dialog box. The iso-candela plots can be presented as false j# f/M3
color maps or contour plots. The distribution plots are graphs of cross-sectional 6 :4GI
curves through the candela distribution. 4PVg?
The orientation of the candela plots is determined by the Normal Vector and the $2Wk#F2c=
Up Vector, as specified in the Analysis|Candela Options dialog box. The ftY&Q#[
normal vector specifies the axis of the candela plot and the up vector specifies D:9^^uVp
“which way is up.”
