给个英文的.个人理解可能会有点出入.基本上是这个意思. YqV8D&I ZKz,|+X0G A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 8`]=C~G units, a luminous intensity plot is in units of candelas (lumens per steradian). In K9kUS radiometric units, an intensity plot is in units of watts per steradian. Candela plots W>=o*{(YO are commonly used in the design of illumination systems, especially those used in Y];Ycj; the far field. jV/CQM5a+ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface t9_E$w^U or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 4#(ZNP the model and “go off to infinity.” Exiting rays are the collection of ray segments {Rear2 following the intersection point of a ray at a surface. Due to ray splitting, several )g|xpb ray segments may contribute to the candela data for each incident ray. Incident j6,ZEm rays are the collection of ray segments which intersect the selected surface. No ;oxAe<VIj surface selection is required for Missed rays but one is necessary for Exiting and <|*'O5B Incident rays. #-Z8Z
i"44 The candela plots represent flux versus angle and can be smoothed using the NJ MJ Candela Options dialog box. The iso-candela plots can be presented as false @O}7XRJ_8 color maps or contour plots. The distribution plots are graphs of cross-sectional ;oNhEB:F curves through the candela distribution. v6GsoQmA The orientation of the candela plots is determined by the Normal Vector and the ~RBrSu) Up Vector, as specified in the Analysis|Candela Options dialog box. The r{seb E\
; normal vector specifies the axis of the candela plot and the up vector specifies 1
Vy,&[c~" “which way is up.”