给个英文的.个人理解可能会有点出入.基本上是这个意思. [f0HUbPX @nP}q!y A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ]S L&x:/- units, a luminous intensity plot is in units of candelas (lumens per steradian). In =oME~oB~ radiometric units, an intensity plot is in units of watts per steradian. Candela plots ej;taKzj are commonly used in the design of illumination systems, especially those used in DBUwf1=qj the far field. u-_$?'l;~ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface `<zb or rays Incident on a surface. Missed rays are a collection of all rays that “leave” b-?o?}* the model and “go off to infinity.” Exiting rays are the collection of ray segments uKy *N*} following the intersection point of a ray at a surface. Due to ray splitting, several !r*;R\!n2 ray segments may contribute to the candela data for each incident ray. Incident WDdi}i>2 rays are the collection of ray segments which intersect the selected surface. No d_uy;-3 surface selection is required for Missed rays but one is necessary for Exiting and @<G/H|f Incident rays. ugB{2oq i The candela plots represent flux versus angle and can be smoothed using the #P#R~b] Candela Options dialog box. The iso-candela plots can be presented as false (J&Xo.<Z- color maps or contour plots. The distribution plots are graphs of cross-sectional s
vb4uvY curves through the candela distribution. 4C%>/*%8> The orientation of the candela plots is determined by the Normal Vector and the lM,zTNu-z Up Vector, as specified in the Analysis|Candela Options dialog box. The iyYY)roB normal vector specifies the axis of the candela plot and the up vector specifies p*,P%tX “which way is up.”