给个英文的.个人理解可能会有点出入.基本上是这个意思. jYi{[** GtNGrJU A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Q($aN- units, a luminous intensity plot is in units of candelas (lumens per steradian). In LwL\CE_6+ radiometric units, an intensity plot is in units of watts per steradian. Candela plots TSCc=c are commonly used in the design of illumination systems, especially those used in zA?]AL(+YW the far field. ^vH3 -A;* Candela data can be collected from ray sets of Missed rays, rays Exiting a surface jQ[M4)>_k` or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ^&-H"jF the model and “go off to infinity.” Exiting rays are the collection of ray segments ^S'tMT_ following the intersection point of a ray at a surface. Due to ray splitting, several _$Hx:^p: ray segments may contribute to the candela data for each incident ray. Incident A}cGag+sp rays are the collection of ray segments which intersect the selected surface. No WJN}d-S=^ surface selection is required for Missed rays but one is necessary for Exiting and 999E0A$dkv Incident rays. <dA1n:3o The candela plots represent flux versus angle and can be smoothed using the l-mf~{ Candela Options dialog box. The iso-candela plots can be presented as false FTfejk! color maps or contour plots. The distribution plots are graphs of cross-sectional 6bW:&IPQ; curves through the candela distribution. >HH49cCo The orientation of the candela plots is determined by the Normal Vector and the &QQ8ut,; Up Vector, as specified in the Analysis|Candela Options dialog box. The (`&`vf normal vector specifies the axis of the candela plot and the up vector specifies zxr|:KC ?& “which way is up.”