给个英文的.个人理解可能会有点出入.基本上是这个意思. ^_+XDO 0$ .m_0H A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric <X7\z units, a luminous intensity plot is in units of candelas (lumens per steradian). In A#h /B+ radiometric units, an intensity plot is in units of watts per steradian. Candela plots 9]'&RyH=# are commonly used in the design of illumination systems, especially those used in R*pC.QiB~ the far field. ]B\H~Kn Candela data can be collected from ray sets of Missed rays, rays Exiting a surface cW8\d or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 62'1X" the model and “go off to infinity.” Exiting rays are the collection of ray segments myFAKRc following the intersection point of a ray at a surface. Due to ray splitting, several xG2+(f#C1 ray segments may contribute to the candela data for each incident ray. Incident d'
>>E rays are the collection of ray segments which intersect the selected surface. No ,YYVj{~2 surface selection is required for Missed rays but one is necessary for Exiting and qPGuo5^ Incident rays. zy'D!db`Z The candela plots represent flux versus angle and can be smoothed using the ShOX<Fb& Candela Options dialog box. The iso-candela plots can be presented as false _banp0ywS color maps or contour plots. The distribution plots are graphs of cross-sectional Q4* -wF-P curves through the candela distribution. L5YnG_M& The orientation of the candela plots is determined by the Normal Vector and the )~)*=u/ Up Vector, as specified in the Analysis|Candela Options dialog box. The
Y k7-` normal vector specifies the axis of the candela plot and the up vector specifies h@{_duu “which way is up.”