给个英文的.个人理解可能会有点出入.基本上是这个意思. yxP ?O@( 4TQISu) A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Tvx8l
m' units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3D09P5$W radiometric units, an intensity plot is in units of watts per steradian. Candela plots =ci5&B? are commonly used in the design of illumination systems, especially those used in vS t=Ax3] the far field. '5,,XhP Candela data can be collected from ray sets of Missed rays, rays Exiting a surface "g:&Ge*X or rays Incident on a surface. Missed rays are a collection of all rays that “leave” s^t1PfP(, the model and “go off to infinity.” Exiting rays are the collection of ray segments ]>4Qs following the intersection point of a ray at a surface. Due to ray splitting, several 5 EuJ ray segments may contribute to the candela data for each incident ray. Incident 3F'dT[; rays are the collection of ray segments which intersect the selected surface. No n#4J]Z@ surface selection is required for Missed rays but one is necessary for Exiting and OYtus7q< Incident rays. y yR8VO{ The candela plots represent flux versus angle and can be smoothed using the x5 ~E'~_ Candela Options dialog box. The iso-candela plots can be presented as false qCkg\)Ks5I color maps or contour plots. The distribution plots are graphs of cross-sectional 4p.{G%h curves through the candela distribution. [;#.DH] The orientation of the candela plots is determined by the Normal Vector and the vzm4 Up Vector, as specified in the Analysis|Candela Options dialog box. The ,sJfMY normal vector specifies the axis of the candela plot and the up vector specifies 6dy4{i “which way is up.”