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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric HpnF,4A>
units, a luminous intensity plot is in units of candelas (lumens per steradian). In l_g$6 \&|
radiometric units, an intensity plot is in units of watts per steradian. Candela plots L'+bVP{L
are commonly used in the design of illumination systems, especially those used in eh86-tQI~(
the far field. %7#<K\])
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface OX_y"]utU
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” W A/dt2D|
the model and “go off to infinity.” Exiting rays are the collection of ray segments ) /raTD
following the intersection point of a ray at a surface. Due to ray splitting, several AdDX_\V,*
ray segments may contribute to the candela data for each incident ray. Incident \+
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rays are the collection of ray segments which intersect the selected surface. No %*D=ni#(sT
surface selection is required for Missed rays but one is necessary for Exiting and 5X{|*?>T
Incident rays. _.5{vGyxr
The candela plots represent flux versus angle and can be smoothed using the KF%BX ~80C
Candela Options dialog box. The iso-candela plots can be presented as false jPWONz(#
color maps or contour plots. The distribution plots are graphs of cross-sectional |E 8sw a
curves through the candela distribution. [\8rh^LFi
The orientation of the candela plots is determined by the Normal Vector and the JR l=j2z
Up Vector, as specified in the Analysis|Candela Options dialog box. The ]s\r3I]
normal vector specifies the axis of the candela plot and the up vector specifies $$9H1)Ny
“which way is up.”
