给个英文的.个人理解可能会有点出入.基本上是这个意思. }; f#^gz' pek%08VSEU A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ^}:# units, a luminous intensity plot is in units of candelas (lumens per steradian). In #B:hPZM1 radiometric units, an intensity plot is in units of watts per steradian. Candela plots 6(G?MW. are commonly used in the design of illumination systems, especially those used in Zf'TJ`S the far field. :{oZ ~< Candela data can be collected from ray sets of Missed rays, rays Exiting a surface B<~ NS)w or rays Incident on a surface. Missed rays are a collection of all rays that “leave” hi0R.V& the model and “go off to infinity.” Exiting rays are the collection of ray segments _>9.v%5cs( following the intersection point of a ray at a surface. Due to ray splitting, several =:/BV=tv ray segments may contribute to the candela data for each incident ray. Incident 7vABq( rays are the collection of ray segments which intersect the selected surface. No |7X:TfJ surface selection is required for Missed rays but one is necessary for Exiting and 6S+U&Ce\ Incident rays. xo&]RYG[< The candela plots represent flux versus angle and can be smoothed using the z}{afEb Candela Options dialog box. The iso-candela plots can be presented as false e_V O3" color maps or contour plots. The distribution plots are graphs of cross-sectional RB+N
IoQQ| curves through the candela distribution. nv0]05.4 The orientation of the candela plots is determined by the Normal Vector and the O9g{+e` Up Vector, as specified in the Analysis|Candela Options dialog box. The $ZNu+tn
Y normal vector specifies the axis of the candela plot and the up vector specifies
~i21%$ “which way is up.”