给个英文的.个人理解可能会有点出入.基本上是这个意思. MX6;ww 5H`k$[3V A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &`0heJ
5Yn units, a luminous intensity plot is in units of candelas (lumens per steradian). In |_
E)2b:h radiometric units, an intensity plot is in units of watts per steradian. Candela plots a{,EX[~b are commonly used in the design of illumination systems, especially those used in ;&?NuK the far field. ~~b[X\1 Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 4: 5 CnK or rays Incident on a surface. Missed rays are a collection of all rays that “leave” X{<j%PdC the model and “go off to infinity.” Exiting rays are the collection of ray segments 67')nEQ9 following the intersection point of a ray at a surface. Due to ray splitting, several gey`HhZp) ray segments may contribute to the candela data for each incident ray. Incident IgQW 5E# rays are the collection of ray segments which intersect the selected surface. No [gQ*y~N surface selection is required for Missed rays but one is necessary for Exiting and NA !;#! Incident rays. :1s6h%evrT The candela plots represent flux versus angle and can be smoothed using the 'C!b($Y Candela Options dialog box. The iso-candela plots can be presented as false pX*Oc6.0mu color maps or contour plots. The distribution plots are graphs of cross-sectional %)u5A!" curves through the candela distribution. ;Rt?&&W The orientation of the candela plots is determined by the Normal Vector and the 7YkxIzE Up Vector, as specified in the Analysis|Candela Options dialog box. The g_5:o
3s normal vector specifies the axis of the candela plot and the up vector specifies XM>ByfD{ “which way is up.”