给个英文的.个人理解可能会有点出入.基本上是这个意思. C-Q28lD}f Y w^m A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric _I@9HC 4 units, a luminous intensity plot is in units of candelas (lumens per steradian). In uJzG|$; radiometric units, an intensity plot is in units of watts per steradian. Candela plots ZCmgs4W! are commonly used in the design of illumination systems, especially those used in l`oZ)?ur the far field. QRHu3w Candela data can be collected from ray sets of Missed rays, rays Exiting a surface T ]t'39 or rays Incident on a surface. Missed rays are a collection of all rays that “leave” |TS>hwkI the model and “go off to infinity.” Exiting rays are the collection of ray segments S2HcG
1J
following the intersection point of a ray at a surface. Due to ray splitting, several R3x3]]D ray segments may contribute to the candela data for each incident ray. Incident XGYbnZ~
rays are the collection of ray segments which intersect the selected surface. No 1S{D6#bE surface selection is required for Missed rays but one is necessary for Exiting and 5gYRwuf Incident rays. 'u *DA|HC The candela plots represent flux versus angle and can be smoothed using the yv t. Candela Options dialog box. The iso-candela plots can be presented as false U{2BVqM color maps or contour plots. The distribution plots are graphs of cross-sectional ULs\+U curves through the candela distribution. /rWd=~[MO The orientation of the candela plots is determined by the Normal Vector and the ojaws+(& y Up Vector, as specified in the Analysis|Candela Options dialog box. The '(U-(wTC'/ normal vector specifies the axis of the candela plot and the up vector specifies EK{Eo9l “which way is up.”