给个英文的.个人理解可能会有点出入.基本上是这个意思. d<V+;">2 aAu
upPu A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 1b;Aru~l units, a luminous intensity plot is in units of candelas (lumens per steradian). In .-`7Av+7 radiometric units, an intensity plot is in units of watts per steradian. Candela plots b\][ x6zJp are commonly used in the design of illumination systems, especially those used in 7SXi#{ the far field. w^p
'D{{ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface o&;+!Si@T or rays Incident on a surface. Missed rays are a collection of all rays that “leave” y$*Tbzp the model and “go off to infinity.” Exiting rays are the collection of ray segments z.]t_`KuF9 following the intersection point of a ray at a surface. Due to ray splitting, several ?_m;~>C ray segments may contribute to the candela data for each incident ray. Incident z mrk`o~ rays are the collection of ray segments which intersect the selected surface. No C
n\'sb{ surface selection is required for Missed rays but one is necessary for Exiting and r&1N8o Incident rays. A:p7\Kp;5} The candela plots represent flux versus angle and can be smoothed using the sTeL4g|%{ Candela Options dialog box. The iso-candela plots can be presented as false u~1[nH: color maps or contour plots. The distribution plots are graphs of cross-sectional }/(fe`7: curves through the candela distribution. 5U3="L The orientation of the candela plots is determined by the Normal Vector and the q'3= Up Vector, as specified in the Analysis|Candela Options dialog box. The 0D|^S<z6 normal vector specifies the axis of the candela plot and the up vector specifies x~j% “which way is up.”