给个英文的.个人理解可能会有点出入.基本上是这个意思. oAeUvmh ^k">A:E2 A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Am|%lj+1z units, a luminous intensity plot is in units of candelas (lumens per steradian). In K
Z91- radiometric units, an intensity plot is in units of watts per steradian. Candela plots y?? XIsF are commonly used in the design of illumination systems, especially those used in WP'!*[z the far field. dcN22A3 Candela data can be collected from ray sets of Missed rays, rays Exiting a surface
dkTX or rays Incident on a surface. Missed rays are a collection of all rays that “leave” +\
.Lp 5 the model and “go off to infinity.” Exiting rays are the collection of ray segments hnhd{$2Z following the intersection point of a ray at a surface. Due to ray splitting, several 9qzHS~l ray segments may contribute to the candela data for each incident ray. Incident \Uq(Zga4) rays are the collection of ray segments which intersect the selected surface. No i<Zc"v; surface selection is required for Missed rays but one is necessary for Exiting and BW*rIn<?G Incident rays. ~=l;=7 T The candela plots represent flux versus angle and can be smoothed using the ?IT*:A]E Candela Options dialog box. The iso-candela plots can be presented as false JL{VD
/f color maps or contour plots. The distribution plots are graphs of cross-sectional A$0fKko curves through the candela distribution. +',S]Edx The orientation of the candela plots is determined by the Normal Vector and the u\;C;I-? ' Up Vector, as specified in the Analysis|Candela Options dialog box. The Fywv normal vector specifies the axis of the candela plot and the up vector specifies /@TF5]Ri “which way is up.”