给个英文的.个人理解可能会有点出入.基本上是这个意思. @}u*|P* D(op)]8 A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric x
M/+L:_< units, a luminous intensity plot is in units of candelas (lumens per steradian). In /|m2WxK) radiometric units, an intensity plot is in units of watts per steradian. Candela plots 4HXo >0 are commonly used in the design of illumination systems, especially those used in .^33MWu6 the far field. XAKs0*J> Candela data can be collected from ray sets of Missed rays, rays Exiting a surface S/hQZHZHg, or rays Incident on a surface. Missed rays are a collection of all rays that “leave” F@7jx:tI the model and “go off to infinity.” Exiting rays are the collection of ray segments #6aW9GO following the intersection point of a ray at a surface. Due to ray splitting, several ?/E~/;+7= ray segments may contribute to the candela data for each incident ray. Incident J9nX"Sb rays are the collection of ray segments which intersect the selected surface. No IJp-BTO{V surface selection is required for Missed rays but one is necessary for Exiting and #4NaL Incident rays. `,*3[ The candela plots represent flux versus angle and can be smoothed using the oAVnK[EMq` Candela Options dialog box. The iso-candela plots can be presented as false VR 8-&N color maps or contour plots. The distribution plots are graphs of cross-sectional 0cH`;!MZ curves through the candela distribution. ij`w} V The orientation of the candela plots is determined by the Normal Vector and the yx8z4*]kH Up Vector, as specified in the Analysis|Candela Options dialog box. The @Sn(lnlB normal vector specifies the axis of the candela plot and the up vector specifies %g$o/A$ “which way is up.”