给个英文的.个人理解可能会有点出入.基本上是这个意思. @.$| w>>T #.rdQ,)< A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric pMw*9sX units, a luminous intensity plot is in units of candelas (lumens per steradian). In dP3CG8w5 radiometric units, an intensity plot is in units of watts per steradian. Candela plots );#JL0I are commonly used in the design of illumination systems, especially those used in FHj"
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* Candela data can be collected from ray sets of Missed rays, rays Exiting a surface zr-*$1eu or rays Incident on a surface. Missed rays are a collection of all rays that “leave” _
TiuY the model and “go off to infinity.” Exiting rays are the collection of ray segments 8IlunJ following the intersection point of a ray at a surface. Due to ray splitting, several s'!Cp=xQF" ray segments may contribute to the candela data for each incident ray. Incident l3Xfc2~ 2 rays are the collection of ray segments which intersect the selected surface. No cqQ#p2<% surface selection is required for Missed rays but one is necessary for Exiting and |Luqoa Incident rays. zd2)M@ The candela plots represent flux versus angle and can be smoothed using the arIf'CG6 Candela Options dialog box. The iso-candela plots can be presented as false .B7,j%1r color maps or contour plots. The distribution plots are graphs of cross-sectional :flx6,7D curves through the candela distribution. {m4b(t`xw The orientation of the candela plots is determined by the Normal Vector and the s^Y"' ` + Up Vector, as specified in the Analysis|Candela Options dialog box. The :ci5r;^ normal vector specifies the axis of the candela plot and the up vector specifies NCiW^#b “which way is up.”