给个英文的.个人理解可能会有点出入.基本上是这个意思. LqZsH0C 2LO8SJ# A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 50<QF units, a luminous intensity plot is in units of candelas (lumens per steradian). In Gr),o6}p radiometric units, an intensity plot is in units of watts per steradian. Candela plots ZNHlq5 are commonly used in the design of illumination systems, especially those used in <"GgqyRzv the far field. bS1?I@ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8^ujA or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 4p}?QR>tZ the model and “go off to infinity.” Exiting rays are the collection of ray segments C2X$ bX" following the intersection point of a ray at a surface. Due to ray splitting, several {*BZ;Xh\8 ray segments may contribute to the candela data for each incident ray. Incident !_yWe rays are the collection of ray segments which intersect the selected surface. No b.N$eJlQ& surface selection is required for Missed rays but one is necessary for Exiting and 3qlY=5Y Incident rays. IonphTcU! The candela plots represent flux versus angle and can be smoothed using the k_o$ Ci Candela Options dialog box. The iso-candela plots can be presented as false 8q}955Nl color maps or contour plots. The distribution plots are graphs of cross-sectional (C3:_cM5 curves through the candela distribution. ;4MC/Q/ The orientation of the candela plots is determined by the Normal Vector and the A$7j B4 Up Vector, as specified in the Analysis|Candela Options dialog box. The sB~ |V
< normal vector specifies the axis of the candela plot and the up vector specifies e+TSjm “which way is up.”