给个英文的.个人理解可能会有点出入.基本上是这个意思. &3 x
[0DV 3g3Znb A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric r:t3Kf`+E- units, a luminous intensity plot is in units of candelas (lumens per steradian). In <@>l9_=R radiometric units, an intensity plot is in units of watts per steradian. Candela plots >%c>R'~h are commonly used in the design of illumination systems, especially those used in lG`%4}1 the far field. u y13SkW Candela data can be collected from ray sets of Missed rays, rays Exiting a surface G9~ 4?v6: or rays Incident on a surface. Missed rays are a collection of all rays that “leave” O]?PC^GGY the model and “go off to infinity.” Exiting rays are the collection of ray segments xH>j following the intersection point of a ray at a surface. Due to ray splitting, several j
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ray segments may contribute to the candela data for each incident ray. Incident Pu,2a+0N rays are the collection of ray segments which intersect the selected surface. No "BC;zH: surface selection is required for Missed rays but one is necessary for Exiting and 0>ce~KU Incident rays. ]4,eCT The candela plots represent flux versus angle and can be smoothed using the 9bUFxSH Candela Options dialog box. The iso-candela plots can be presented as false 8)YDUE%VH color maps or contour plots. The distribution plots are graphs of cross-sectional "|/Q5*L curves through the candela distribution. +-Z `v The orientation of the candela plots is determined by the Normal Vector and the =A_fL{ SM Up Vector, as specified in the Analysis|Candela Options dialog box. The zCmx 1Djz normal vector specifies the axis of the candela plot and the up vector specifies ^K:-r !v^ “which way is up.”