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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric j h bonuV_
units, a luminous intensity plot is in units of candelas (lumens per steradian). In kn"(mJe$
radiometric units, an intensity plot is in units of watts per steradian. Candela plots a ^d8I
are commonly used in the design of illumination systems, especially those used in sZGj"_-Hzu
the far field. PjA6Ji ;Hu
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 9o*,P,j'}
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” >K9#3
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the model and “go off to infinity.” Exiting rays are the collection of ray segments b` Hz$8
following the intersection point of a ray at a surface. Due to ray splitting, several l 'DsZ9y@2
ray segments may contribute to the candela data for each incident ray. Incident a ]
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rays are the collection of ray segments which intersect the selected surface. No OyV<u@[i
surface selection is required for Missed rays but one is necessary for Exiting and 0sca4G0{
Incident rays. :0 & X^]\
The candela plots represent flux versus angle and can be smoothed using the OCZa Q33
Candela Options dialog box. The iso-candela plots can be presented as false ^sN (
color maps or contour plots. The distribution plots are graphs of cross-sectional ABE@n%|`
curves through the candela distribution. ;2' q_Btk4
The orientation of the candela plots is determined by the Normal Vector and the .
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Up Vector, as specified in the Analysis|Candela Options dialog box. The s*U1
normal vector specifies the axis of the candela plot and the up vector specifies <S? ddp 2
“which way is up.”
