给个英文的.个人理解可能会有点出入.基本上是这个意思. #U6qM(J >Fh@:M7z A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric *WG}K?"/ units, a luminous intensity plot is in units of candelas (lumens per steradian). In rG6/h'!| radiometric units, an intensity plot is in units of watts per steradian. Candela plots p
IToy;] are commonly used in the design of illumination systems, especially those used in RB!E>] the far field. 7\lb+^$ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface O'(vs"eN or rays Incident on a surface. Missed rays are a collection of all rays that “leave” hd' n" the model and “go off to infinity.” Exiting rays are the collection of ray segments 4{pa`o3 following the intersection point of a ray at a surface. Due to ray splitting, several
lNw?}H ray segments may contribute to the candela data for each incident ray. Incident I 3PnyNZ rays are the collection of ray segments which intersect the selected surface. No &2J|v#$F surface selection is required for Missed rays but one is necessary for Exiting and V"XN(Fd^ Incident rays. 3[4]G@ The candela plots represent flux versus angle and can be smoothed using the u a-p^X`w Candela Options dialog box. The iso-candela plots can be presented as false E%N]t} }[ color maps or contour plots. The distribution plots are graphs of cross-sectional ZWH`s curves through the candela distribution. xh$[E&2u The orientation of the candela plots is determined by the Normal Vector and the @Ia ~9yOY Up Vector, as specified in the Analysis|Candela Options dialog box. The U@WT;:.T normal vector specifies the axis of the candela plot and the up vector specifies ^8)d8?} “which way is up.”