给个英文的.个人理解可能会有点出入.基本上是这个意思. [p@NzS/ }M/w 0U0o A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric &tZ?%sr units, a luminous intensity plot is in units of candelas (lumens per steradian). In }Iub{30mp radiometric units, an intensity plot is in units of watts per steradian. Candela plots )T#;1qNB are commonly used in the design of illumination systems, especially those used in U6X~]| o the far field. nx=#QLi Candela data can be collected from ray sets of Missed rays, rays Exiting a surface l{#m"S7J^ or rays Incident on a surface. Missed rays are a collection of all rays that “leave” GMU<$x8o the model and “go off to infinity.” Exiting rays are the collection of ray segments #`GW7(M following the intersection point of a ray at a surface. Due to ray splitting, several +,>f-kaV ray segments may contribute to the candela data for each incident ray. Incident @.*[CC;& rays are the collection of ray segments which intersect the selected surface. No *ILS/`mdav surface selection is required for Missed rays but one is necessary for Exiting and o;Zoj} Incident rays. `#fOY$#XB The candela plots represent flux versus angle and can be smoothed using the CpS'2@6 Candela Options dialog box. The iso-candela plots can be presented as false ~B(]0: color maps or contour plots. The distribution plots are graphs of cross-sectional =&"Vf!7YR7 curves through the candela distribution. ^yK94U;<Gy The orientation of the candela plots is determined by the Normal Vector and the |!%A1 wp# Up Vector, as specified in the Analysis|Candela Options dialog box. The R)cns7oW normal vector specifies the axis of the candela plot and the up vector specifies a\}|ikiE “which way is up.”