给个英文的.个人理解可能会有点出入.基本上是这个意思. `d4;T|f+= [nLd> 2P A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric !eP0b~$/^J units, a luminous intensity plot is in units of candelas (lumens per steradian). In JPpNCC.b radiometric units, an intensity plot is in units of watts per steradian. Candela plots K~+x@O* are commonly used in the design of illumination systems, especially those used in 7pM&))R the far field. 74a k|(! Candela data can be collected from ray sets of Missed rays, rays Exiting a surface :=\`P or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 2 ]}e4@{ the model and “go off to infinity.” Exiting rays are the collection of ray segments ge#P(Itz following the intersection point of a ray at a surface. Due to ray splitting, several #J~xKyJi' ray segments may contribute to the candela data for each incident ray. Incident GQ}R xu] rays are the collection of ray segments which intersect the selected surface. No vy5I#q(k surface selection is required for Missed rays but one is necessary for Exiting and -BH T'zq1S Incident rays. ^_/gM[H. The candela plots represent flux versus angle and can be smoothed using the QB*n
[(? Candela Options dialog box. The iso-candela plots can be presented as false Mo\nY5 color maps or contour plots. The distribution plots are graphs of cross-sectional aT8A+=K6 curves through the candela distribution.
pp()Hu3J The orientation of the candela plots is determined by the Normal Vector and the E//*bmww Up Vector, as specified in the Analysis|Candela Options dialog box. The gF\a c%9 normal vector specifies the axis of the candela plot and the up vector specifies $'KhA6u “which way is up.”