给个英文的.个人理解可能会有点出入.基本上是这个意思. j[m_qohd7 (^DLCP#* A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric J8GXI :y units, a luminous intensity plot is in units of candelas (lumens per steradian). In D0Vyh"ua radiometric units, an intensity plot is in units of watts per steradian. Candela plots W 9&0k+#^ are commonly used in the design of illumination systems, especially those used in RjR&D?dc the far field. IdV,%d{ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface .])>A')r or rays Incident on a surface. Missed rays are a collection of all rays that “leave” '!j #X_; the model and “go off to infinity.” Exiting rays are the collection of ray segments 6?1s`{yy following the intersection point of a ray at a surface. Due to ray splitting, several XD$% ray segments may contribute to the candela data for each incident ray. Incident F,p`-m[q rays are the collection of ray segments which intersect the selected surface. No e5qrQwU surface selection is required for Missed rays but one is necessary for Exiting and #D|!
.I) Incident rays. Xmap9x The candela plots represent flux versus angle and can be smoothed using the 0`VD!_` Candela Options dialog box. The iso-candela plots can be presented as false YVQ_tCC_! color maps or contour plots. The distribution plots are graphs of cross-sectional krQl^~@ curves through the candela distribution. 8
3z'# The orientation of the candela plots is determined by the Normal Vector and the M>*0r<qn Up Vector, as specified in the Analysis|Candela Options dialog box. The B`?N,N" normal vector specifies the axis of the candela plot and the up vector specifies 5y1or “which way is up.”