给个英文的.个人理解可能会有点出入.基本上是这个意思. J1X~vQAe &pL/
@2+ A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ~@D/A/| units, a luminous intensity plot is in units of candelas (lumens per steradian). In pw\P<9e= radiometric units, an intensity plot is in units of watts per steradian. Candela plots 2e59Ez%k6 are commonly used in the design of illumination systems, especially those used in wx*1*KZ the far field. t+O e)Ns Candela data can be collected from ray sets of Missed rays, rays Exiting a surface QD$Gw-U-l= or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 7\X$7 the model and “go off to infinity.” Exiting rays are the collection of ray segments GJ,aRI following the intersection point of a ray at a surface. Due to ray splitting, several hO3{ ray segments may contribute to the candela data for each incident ray. Incident FqZgdmwR rays are the collection of ray segments which intersect the selected surface. No 0q#"clw surface selection is required for Missed rays but one is necessary for Exiting and k3>YBf`fC Incident rays. 6]n/+[ ks The candela plots represent flux versus angle and can be smoothed using the G>K@AW# Candela Options dialog box. The iso-candela plots can be presented as false s6n`?,vw color maps or contour plots. The distribution plots are graphs of cross-sectional =ewy Q
curves through the candela distribution. m(_9<bc> The orientation of the candela plots is determined by the Normal Vector and the #K4*6LI Up Vector, as specified in the Analysis|Candela Options dialog box. The ugLlI2 nJ normal vector specifies the axis of the candela plot and the up vector specifies _{)9b24(
“which way is up.”