给个英文的.个人理解可能会有点出入.基本上是这个意思. cAc i2e 3It'!R8 $ A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric $'Hg}|53 units, a luminous intensity plot is in units of candelas (lumens per steradian). In c!%:f^7g radiometric units, an intensity plot is in units of watts per steradian. Candela plots TY|]""3f9 are commonly used in the design of illumination systems, especially those used in b#C"rTw the far field. =>CrZ23B" Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ^$y_~z3o#7 or rays Incident on a surface. Missed rays are a collection of all rays that “leave” gU}?Yy the model and “go off to infinity.” Exiting rays are the collection of ray segments 8Q1){M9' following the intersection point of a ray at a surface. Due to ray splitting, several VRoeq { ray segments may contribute to the candela data for each incident ray. Incident ;G3{ e rays are the collection of ray segments which intersect the selected surface. No <ZNa` surface selection is required for Missed rays but one is necessary for Exiting and -j9R%+YW< Incident rays. !2N#H~{ The candela plots represent flux versus angle and can be smoothed using the ca_8S8lv Candela Options dialog box. The iso-candela plots can be presented as false VMW?[j color maps or contour plots. The distribution plots are graphs of cross-sectional 5\tYs=>b< curves through the candela distribution. `#X{. The orientation of the candela plots is determined by the Normal Vector and the pz^"~0o5 Up Vector, as specified in the Analysis|Candela Options dialog box. The m-a_<xo normal vector specifies the axis of the candela plot and the up vector specifies <_H0Q_/( “which way is up.”