给个英文的.个人理解可能会有点出入.基本上是这个意思. !XO"lS GP_%.fO\M A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric @[~j|YH} units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3q.HZfN~ radiometric units, an intensity plot is in units of watts per steradian. Candela plots fT5vO.a
are commonly used in the design of illumination systems, especially those used in 8^hbS%s! the far field. T*](oA@ Candela data can be collected from ray sets of Missed rays, rays Exiting a surface LcGG~P|ML or rays Incident on a surface. Missed rays are a collection of all rays that “leave” h&x;#.SYK the model and “go off to infinity.” Exiting rays are the collection of ray segments G<`6S5J>hr following the intersection point of a ray at a surface. Due to ray splitting, several Y
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2d ray segments may contribute to the candela data for each incident ray. Incident 6{H@VF<QY! rays are the collection of ray segments which intersect the selected surface. No lLN5***47J surface selection is required for Missed rays but one is necessary for Exiting and wQ '_, d Incident rays. Z=^~]Mfa The candela plots represent flux versus angle and can be smoothed using the $mn+ Candela Options dialog box. The iso-candela plots can be presented as false lD,;xuQ color maps or contour plots. The distribution plots are graphs of cross-sectional 7kmd.< curves through the candela distribution. qjf9ZD& The orientation of the candela plots is determined by the Normal Vector and the ,AyQCUz{*? Up Vector, as specified in the Analysis|Candela Options dialog box. The \6vr)1~N> normal vector specifies the axis of the candela plot and the up vector specifies N9=?IFEe] “which way is up.”