给个英文的.个人理解可能会有点出入.基本上是这个意思. `Q d_Gu,M
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 8,0p14I5;
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ^6=y4t=%F
radiometric units, an intensity plot is in units of watts per steradian. Candela plots *QAcp` ;*
are commonly used in the design of illumination systems, especially those used in =5bef8 O
the far field. {"< D$*K~
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface W7 9wz\a
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” hr9[$4'H
the model and “go off to infinity.” Exiting rays are the collection of ray segments Ii"h:GY;\
following the intersection point of a ray at a surface. Due to ray splitting, several d_CY=DHF%`
ray segments may contribute to the candela data for each incident ray. Incident [[(29|`]
rays are the collection of ray segments which intersect the selected surface. No Bny3j~*U
surface selection is required for Missed rays but one is necessary for Exiting and , VT&
Incident rays. d+ P<nI/|
The candela plots represent flux versus angle and can be smoothed using the $q`650&S*
Candela Options dialog box. The iso-candela plots can be presented as false 0zD[mt
color maps or contour plots. The distribution plots are graphs of cross-sectional *n $=2v^A
curves through the candela distribution. X-$~j+YC
The orientation of the candela plots is determined by the Normal Vector and the 3ifQKKcR{
Up Vector, as specified in the Analysis|Candela Options dialog box. The &)?ECj0`
normal vector specifies the axis of the candela plot and the up vector specifies G } B)bM2
“which way is up.”
