给个英文的.个人理解可能会有点出入.基本上是这个意思. {UH45#Ua
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ~U+<JC Z
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ErN[maix#
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 5REH`-
are commonly used in the design of illumination systems, especially those used in Eq@sU?j
the far field. ~ESw* 6s9
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface U["<f`z4\
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” mq{Z
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the model and “go off to infinity.” Exiting rays are the collection of ray segments d{TcjZ
following the intersection point of a ray at a surface. Due to ray splitting, several CCpRQKb=
ray segments may contribute to the candela data for each incident ray. Incident M_O$]^I3w
rays are the collection of ray segments which intersect the selected surface. No l>jrY1u
surface selection is required for Missed rays but one is necessary for Exiting and Q3=X#FQ
Incident rays. +R?E @S
The candela plots represent flux versus angle and can be smoothed using the [\F:NLjiUy
Candela Options dialog box. The iso-candela plots can be presented as false X6sZwb
color maps or contour plots. The distribution plots are graphs of cross-sectional B^19![v3T
curves through the candela distribution. hW~% :v
The orientation of the candela plots is determined by the Normal Vector and the 0MT?}D&TL
Up Vector, as specified in the Analysis|Candela Options dialog box. The i~GW
normal vector specifies the axis of the candela plot and the up vector specifies 02 FLe*zQ
“which way is up.”