给个英文的.个人理解可能会有点出入.基本上是这个意思. 8>x!n/z) Tz4,lwuWX7 A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric :6S!1roi units, a luminous intensity plot is in units of candelas (lumens per steradian). In !Y>lAx d radiometric units, an intensity plot is in units of watts per steradian. Candela plots Yz=(zj are commonly used in the design of illumination systems, especially those used in %'a%ynFs the far field. "+/%s#& Candela data can be collected from ray sets of Missed rays, rays Exiting a surface
H;s or rays Incident on a surface. Missed rays are a collection of all rays that “leave” F B9PIsFS the model and “go off to infinity.” Exiting rays are the collection of ray segments seC]=UJh#> following the intersection point of a ray at a surface. Due to ray splitting, several GwQW
I] ray segments may contribute to the candela data for each incident ray. Incident |iKk'Rta4 rays are the collection of ray segments which intersect the selected surface. No mE'y$5ZxY surface selection is required for Missed rays but one is necessary for Exiting and GR@!mf Incident rays. -$**/~0zU The candela plots represent flux versus angle and can be smoothed using the b6:A-jb*I Candela Options dialog box. The iso-candela plots can be presented as false #qrZ(,I@n color maps or contour plots. The distribution plots are graphs of cross-sectional L^bt-QbhO curves through the candela distribution. J(JsfU4 The orientation of the candela plots is determined by the Normal Vector and the )Fx"S.Ok Up Vector, as specified in the Analysis|Candela Options dialog box. The L`;p.L
Bs_ normal vector specifies the axis of the candela plot and the up vector specifies +%Q: “which way is up.”