给个英文的.个人理解可能会有点出入.基本上是这个意思. *ezft&{)` qs_cC3"=%= A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Nlwt}7 units, a luminous intensity plot is in units of candelas (lumens per steradian). In bJR\d0Z radiometric units, an intensity plot is in units of watts per steradian. Candela plots DW :\6k are commonly used in the design of illumination systems, especially those used in
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface e7&RZ+s#wZ or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ;'Z"CbS+ the model and “go off to infinity.” Exiting rays are the collection of ray segments U7f
o4y1} following the intersection point of a ray at a surface. Due to ray splitting, several NE)w$>0M ray segments may contribute to the candela data for each incident ray. Incident h<PS< rays are the collection of ray segments which intersect the selected surface. No XH/!A`ZK surface selection is required for Missed rays but one is necessary for Exiting and :6EX-Xyj Incident rays. ]6|?H6'/`v The candela plots represent flux versus angle and can be smoothed using the (dO0`wfM Candela Options dialog box. The iso-candela plots can be presented as false REi"Aj= color maps or contour plots. The distribution plots are graphs of cross-sectional YZnFU( j curves through the candela distribution. f.oY:3h: The orientation of the candela plots is determined by the Normal Vector and the 2_?VR~mA# Up Vector, as specified in the Analysis|Candela Options dialog box. The AxTFVot normal vector specifies the axis of the candela plot and the up vector specifies Qx!Bf_,J “which way is up.”