给个英文的.个人理解可能会有点出入.基本上是这个意思. 7h<Q{X<A 23qTmh A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric q+3Z3v units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]/HSlT= radiometric units, an intensity plot is in units of watts per steradian. Candela plots NM/?jF@j* are commonly used in the design of illumination systems, especially those used in oU$Niw9f the far field. X(?.*m@+TB Candela data can be collected from ray sets of Missed rays, rays Exiting a surface }qG{1Er or rays Incident on a surface. Missed rays are a collection of all rays that “leave” G7pj.rQ the model and “go off to infinity.” Exiting rays are the collection of ray segments 5 r"`c following the intersection point of a ray at a surface. Due to ray splitting, several %(Nu"3|$K= ray segments may contribute to the candela data for each incident ray. Incident B+iVK(j'[v rays are the collection of ray segments which intersect the selected surface. No mgL~ $ surface selection is required for Missed rays but one is necessary for Exiting and *|Q'?ty(x Incident rays. Y;p _ff The candela plots represent flux versus angle and can be smoothed using the j =r`[Bm Candela Options dialog box. The iso-candela plots can be presented as false *.ri8 color maps or contour plots. The distribution plots are graphs of cross-sectional CVo@zr$ curves through the candela distribution. %8>s :YG The orientation of the candela plots is determined by the Normal Vector and the {%9)l, Up Vector, as specified in the Analysis|Candela Options dialog box. The vJ7I
[Z normal vector specifies the axis of the candela plot and the up vector specifies BP,"vq $'+ “which way is up.”