给个英文的.个人理解可能会有点出入.基本上是这个意思. iWNTI $/uNV1]o A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric `L<)9* units, a luminous intensity plot is in units of candelas (lumens per steradian). In ;q&\>u: radiometric units, an intensity plot is in units of watts per steradian. Candela plots ,9;d"ce are commonly used in the design of illumination systems, especially those used in w_
po47S4 the far field. ,*$/2nB^ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface tHo0q<.oX or rays Incident on a surface. Missed rays are a collection of all rays that “leave” B(%bBhs the model and “go off to infinity.” Exiting rays are the collection of ray segments D7Nz3.j following the intersection point of a ray at a surface. Due to ray splitting, several X@7K#@5 ray segments may contribute to the candela data for each incident ray. Incident \w=7L-
8 rays are the collection of ray segments which intersect the selected surface. No k^PqB+P! surface selection is required for Missed rays but one is necessary for Exiting and vDAv/l9 Incident rays. SY}iU@xo The candela plots represent flux versus angle and can be smoothed using the ,As78^E{ Candela Options dialog box. The iso-candela plots can be presented as false y|+ltA K color maps or contour plots. The distribution plots are graphs of cross-sectional @9rmm)TZ curves through the candela distribution. N#`aVW'{v2 The orientation of the candela plots is determined by the Normal Vector and the R.)U<`| | Up Vector, as specified in the Analysis|Candela Options dialog box. The ljrA^P,>P normal vector specifies the axis of the candela plot and the up vector specifies uPpRzp “which way is up.”