给个英文的.个人理解可能会有点出入.基本上是这个意思. = -oP,$k Lz1KDXr`)+ A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric +}m`$B}mJ units, a luminous intensity plot is in units of candelas (lumens per steradian). In V<WWtu;3 radiometric units, an intensity plot is in units of watts per steradian. Candela plots drAJ-ii are commonly used in the design of illumination systems, especially those used in (.$$U3\ the far field. [,Ul Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;}6wj@8He or rays Incident on a surface. Missed rays are a collection of all rays that “leave” `pfgx^qG the model and “go off to infinity.” Exiting rays are the collection of ray segments #Tc`W_- following the intersection point of a ray at a surface. Due to ray splitting, several Y"t|0dO%b ray segments may contribute to the candela data for each incident ray. Incident N$>Ml!J rays are the collection of ray segments which intersect the selected surface. No ED8{ surface selection is required for Missed rays but one is necessary for Exiting and %S^ke`MhF Incident rays. gA=Pz[i)p The candela plots represent flux versus angle and can be smoothed using the A@~9r9Uf Candela Options dialog box. The iso-candela plots can be presented as false O_ r-(wE4 color maps or contour plots. The distribution plots are graphs of cross-sectional dUB;ZB7 curves through the candela distribution. 2XyyU}.$ The orientation of the candela plots is determined by the Normal Vector and the rWWpP< Up Vector, as specified in the Analysis|Candela Options dialog box. The (;g/wb: normal vector specifies the axis of the candela plot and the up vector specifies M5*Ln-qt(a “which way is up.”