给个英文的.个人理解可能会有点出入.基本上是这个意思. `3P62M<
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric _H<OfAO
units, a luminous intensity plot is in units of candelas (lumens per steradian). In G6mM6(Sr
radiometric units, an intensity plot is in units of watts per steradian. Candela plots >,vW
are commonly used in the design of illumination systems, especially those used in @@mW+16
the far field. rB|:r\Z(jG
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ~cj:AIF
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” MJpTr5Vs
the model and “go off to infinity.” Exiting rays are the collection of ray segments |RXC;zt9s
following the intersection point of a ray at a surface. Due to ray splitting, several ]!o,S{a&
ray segments may contribute to the candela data for each incident ray. Incident @7 HBXP
rays are the collection of ray segments which intersect the selected surface. No 8&hn$~ate
surface selection is required for Missed rays but one is necessary for Exiting and Cy'W!qH
Incident rays. *<QL[qyV
The candela plots represent flux versus angle and can be smoothed using the TiEJyd`P
Candela Options dialog box. The iso-candela plots can be presented as false S%#Mu|
color maps or contour plots. The distribution plots are graphs of cross-sectional Eakjsk
curves through the candela distribution. 0%j;yzQ<
The orientation of the candela plots is determined by the Normal Vector and the K
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Up Vector, as specified in the Analysis|Candela Options dialog box. The Dq4}VkY
normal vector specifies the axis of the candela plot and the up vector specifies Jn&>Z? @
“which way is up.”