给个英文的.个人理解可能会有点出入.基本上是这个意思. Y /$`vgqs
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric v6(Y z[
units, a luminous intensity plot is in units of candelas (lumens per steradian). In dfl| 6R
radiometric units, an intensity plot is in units of watts per steradian. Candela plots $fES06%
are commonly used in the design of illumination systems, especially those used in 2[6>h)
the far field. `B'*ln'r5
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface |U)m'W -(q
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” XJ,P8nx
the model and “go off to infinity.” Exiting rays are the collection of ray segments BB@I|)9O(
following the intersection point of a ray at a surface. Due to ray splitting, several ~'> R K
ray segments may contribute to the candela data for each incident ray. Incident ` ]%\Y>(a}
rays are the collection of ray segments which intersect the selected surface. No ^wN x5t
surface selection is required for Missed rays but one is necessary for Exiting and [- C -+jC
Incident rays. e rTb9`N4
The candela plots represent flux versus angle and can be smoothed using the GO0Spf_Gh
Candela Options dialog box. The iso-candela plots can be presented as false |TM&:4D]^
color maps or contour plots. The distribution plots are graphs of cross-sectional `2`Nu:r^
curves through the candela distribution. Rj6:.KEJ
The orientation of the candela plots is determined by the Normal Vector and the 9ZFvN*Zf'
Up Vector, as specified in the Analysis|Candela Options dialog box. The &S[tI$
normal vector specifies the axis of the candela plot and the up vector specifies O92a*)
“which way is up.”
