给个英文的.个人理解可能会有点出入.基本上是这个意思. 1r-,V X7
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric "*>QxA%c4
units, a luminous intensity plot is in units of candelas (lumens per steradian). In @l6 d J
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Z5^,!6
are commonly used in the design of illumination systems, especially those used in Om?:X!l"
the far field. [#@p{[ ?r
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface ;;"c+
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” @ :
the model and “go off to infinity.” Exiting rays are the collection of ray segments J`D <
following the intersection point of a ray at a surface. Due to ray splitting, several 2Z1(J % 7
ray segments may contribute to the candela data for each incident ray. Incident NN pa69U
rays are the collection of ray segments which intersect the selected surface. No I8pxo7(-
surface selection is required for Missed rays but one is necessary for Exiting and ABYW 1K=
Incident rays. ah@GSu;7
The candela plots represent flux versus angle and can be smoothed using the ljR?* P
Candela Options dialog box. The iso-candela plots can be presented as false j~j
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color maps or contour plots. The distribution plots are graphs of cross-sectional 0PX@E-n
curves through the candela distribution. I :2jwAl
The orientation of the candela plots is determined by the Normal Vector and the @m d^mss
Up Vector, as specified in the Analysis|Candela Options dialog box. The "kuBjj2
normal vector specifies the axis of the candela plot and the up vector specifies O!cO/]<
“which way is up.”
