给个英文的.个人理解可能会有点出入.基本上是这个意思. o|VM{5 5XNFu C9E A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric .m%ygoO units, a luminous intensity plot is in units of candelas (lumens per steradian). In j6rwlwN radiometric units, an intensity plot is in units of watts per steradian. Candela plots D rouEm are commonly used in the design of illumination systems, especially those used in 4Rl~7| the far field. 4?x$O{D5?{ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface W%#LHluP or rays Incident on a surface. Missed rays are a collection of all rays that “leave” [lj^lN8 the model and “go off to infinity.” Exiting rays are the collection of ray segments =vKSvQP@) following the intersection point of a ray at a surface. Due to ray splitting, several M[=sQnnSFW ray segments may contribute to the candela data for each incident ray. Incident W TC/mcS rays are the collection of ray segments which intersect the selected surface. No # 9ZO1\ surface selection is required for Missed rays but one is necessary for Exiting and n{%[G2.A Incident rays. j&,%v+x The candela plots represent flux versus angle and can be smoothed using the 04#r'UIF Candela Options dialog box. The iso-candela plots can be presented as false kx[h41|n color maps or contour plots. The distribution plots are graphs of cross-sectional wOl]N2< curves through the candela distribution. 1ZfhDtK( The orientation of the candela plots is determined by the Normal Vector and the Z&y9m@ Up Vector, as specified in the Analysis|Candela Options dialog box. The &?SU3@3| normal vector specifies the axis of the candela plot and the up vector specifies &PEw8: TX “which way is up.”