给个英文的.个人理解可能会有点出入.基本上是这个意思. +G>;NiP_
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric h5R5FzY0&
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ppo\cy;
radiometric units, an intensity plot is in units of watts per steradian. Candela plots B=J/HiwV)
are commonly used in the design of illumination systems, especially those used in OgB ZoTT
the far field. @X*r5hjc
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface h; sdm/
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” B|n<{g[-cM
the model and “go off to infinity.” Exiting rays are the collection of ray segments e8<[2J)P&
following the intersection point of a ray at a surface. Due to ray splitting, several <IL$8a
ray segments may contribute to the candela data for each incident ray. Incident R^F\2yth-
rays are the collection of ray segments which intersect the selected surface. No WXC}Ie
surface selection is required for Missed rays but one is necessary for Exiting and NX4}o&mDwn
Incident rays. j=,]b6 (
The candela plots represent flux versus angle and can be smoothed using the haMt2S2_B:
Candela Options dialog box. The iso-candela plots can be presented as false dLI`\e<r&[
color maps or contour plots. The distribution plots are graphs of cross-sectional rnC u=n
curves through the candela distribution. 9oA.!4q
The orientation of the candela plots is determined by the Normal Vector and the a
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Up Vector, as specified in the Analysis|Candela Options dialog box. The Bn_@R`
normal vector specifies the axis of the candela plot and the up vector specifies 2KC~; 5
“which way is up.”
