给个英文的.个人理解可能会有点出入.基本上是这个意思. }yCJ#} @sv==|h A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric hM\<1D
CKG units, a luminous intensity plot is in units of candelas (lumens per steradian). In c'?4*O radiometric units, an intensity plot is in units of watts per steradian. Candela plots 4Z>hP]7
are commonly used in the design of illumination systems, especially those used in [b-27\b the far field. -]"=b\Q Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 50%
|9D0?Y or rays Incident on a surface. Missed rays are a collection of all rays that “leave” T">-%-t the model and “go off to infinity.” Exiting rays are the collection of ray segments {bnNY following the intersection point of a ray at a surface. Due to ray splitting, several rBLkowDP* ray segments may contribute to the candela data for each incident ray. Incident y]QG; rays are the collection of ray segments which intersect the selected surface. No Y,K): ~T surface selection is required for Missed rays but one is necessary for Exiting and gv$6\1 Incident rays. *m:h0[[J The candela plots represent flux versus angle and can be smoothed using the V !G&Aen Candela Options dialog box. The iso-candela plots can be presented as false <y1V2Np color maps or contour plots. The distribution plots are graphs of cross-sectional Q/r0p> curves through the candela distribution. ?T-6|vZA The orientation of the candela plots is determined by the Normal Vector and the 6dQa|ACX_ Up Vector, as specified in the Analysis|Candela Options dialog box. The JmdXh/X normal vector specifies the axis of the candela plot and the up vector specifies 3?I^D /K^ “which way is up.”