给个英文的.个人理解可能会有点出入.基本上是这个意思. )+L.$h RZ+SOZs7H A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 7^bde<0 units, a luminous intensity plot is in units of candelas (lumens per steradian). In C]dK/~Z#r radiometric units, an intensity plot is in units of watts per steradian. Candela plots 4C]>{osv are commonly used in the design of illumination systems, especially those used in SobOUly5{ the far field. "1I\~]] Candela data can be collected from ray sets of Missed rays, rays Exiting a surface "fH"U1Bw or rays Incident on a surface. Missed rays are a collection of all rays that “leave” o%j[]P@4G the model and “go off to infinity.” Exiting rays are the collection of ray segments e]5
n4"]D) following the intersection point of a ray at a surface. Due to ray splitting, several QP?eKW9 : ray segments may contribute to the candela data for each incident ray. Incident sW#OA\i& rays are the collection of ray segments which intersect the selected surface. No 'cgB$:T}., surface selection is required for Missed rays but one is necessary for Exiting and I
l2`c}9 Incident rays. rP%B#%;S" The candela plots represent flux versus angle and can be smoothed using the OK8|w]-A Candela Options dialog box. The iso-candela plots can be presented as false JnodDH ? color maps or contour plots. The distribution plots are graphs of cross-sectional <0sT curves through the candela distribution. !TwH;#U w The orientation of the candela plots is determined by the Normal Vector and the J>w3>8!>7 Up Vector, as specified in the Analysis|Candela Options dialog box. The fg?4/]*T6 normal vector specifies the axis of the candela plot and the up vector specifies K+P:g%M “which way is up.”