给个英文的.个人理解可能会有点出入.基本上是这个意思. kee|42E KV*xApb9y A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric (} 5S units, a luminous intensity plot is in units of candelas (lumens per steradian). In W(Uu@^ radiometric units, an intensity plot is in units of watts per steradian. Candela plots _ %x4ty are commonly used in the design of illumination systems, especially those used in &V<W>Y>|l* the far field. 6Kj'ZyVL Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Cua%1]"4w or rays Incident on a surface. Missed rays are a collection of all rays that “leave” KPpHwcYxT the model and “go off to infinity.” Exiting rays are the collection of ray segments fI7j):h; following the intersection point of a ray at a surface. Due to ray splitting, several $\"9<o|h ray segments may contribute to the candela data for each incident ray. Incident "sKa`WN} rays are the collection of ray segments which intersect the selected surface. No #%FN>v3e surface selection is required for Missed rays but one is necessary for Exiting and V`-vR2( Incident rays. &BvZF The candela plots represent flux versus angle and can be smoothed using the PD LpNTBf Candela Options dialog box. The iso-candela plots can be presented as false N|Sf=q?Ko color maps or contour plots. The distribution plots are graphs of cross-sectional 7lo|dg80 curves through the candela distribution. LjH*rjS4 The orientation of the candela plots is determined by the Normal Vector and the //&j<vus Up Vector, as specified in the Analysis|Candela Options dialog box. The +~ #U7xgq/ normal vector specifies the axis of the candela plot and the up vector specifies ;=< ^0hxer “which way is up.”