给个英文的.个人理解可能会有点出入.基本上是这个意思. r90+,aLM#?
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric e[u?_h
units, a luminous intensity plot is in units of candelas (lumens per steradian). In foF19_2 ,
radiometric units, an intensity plot is in units of watts per steradian. Candela plots }*]B-\>
are commonly used in the design of illumination systems, especially those used in 14eW4~Mr
the far field. uaw~ r2
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface kEeo5X N
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” pnyWcrBf
the model and “go off to infinity.” Exiting rays are the collection of ray segments dBsX*}C
following the intersection point of a ray at a surface. Due to ray splitting, several JG`Q;K
ray segments may contribute to the candela data for each incident ray. Incident lA!"z~03*
rays are the collection of ray segments which intersect the selected surface. No RT /o$$
surface selection is required for Missed rays but one is necessary for Exiting and f8 /'%$N
Incident rays. I7+9~5p
The candela plots represent flux versus angle and can be smoothed using the 3H\w 2V
Candela Options dialog box. The iso-candela plots can be presented as false aIy*pmpD=
color maps or contour plots. The distribution plots are graphs of cross-sectional MfF~8
curves through the candela distribution. [$(%dV6O
The orientation of the candela plots is determined by the Normal Vector and the .%BT,$1K
Up Vector, as specified in the Analysis|Candela Options dialog box. The -Ue$T{;RoH
normal vector specifies the axis of the candela plot and the up vector specifies Z0!5d<
“which way is up.”
