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#Eqe O
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric hpAIIgn
units, a luminous intensity plot is in units of candelas (lumens per steradian). In -,XS2[
radiometric units, an intensity plot is in units of watts per steradian. Candela plots * z{D}L-&
are commonly used in the design of illumination systems, especially those used in gb@!Co3
the far field. )FU4i N)ei
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface *N Xwllrci
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &s]
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the model and “go off to infinity.” Exiting rays are the collection of ray segments 5i1 >z{
following the intersection point of a ray at a surface. Due to ray splitting, several )03.6 Pvs
ray segments may contribute to the candela data for each incident ray. Incident T,H]svN5p
rays are the collection of ray segments which intersect the selected surface. No 4&`66\p;
surface selection is required for Missed rays but one is necessary for Exiting and zb;2xTH+
Incident rays. ybYSz@7
The candela plots represent flux versus angle and can be smoothed using the 1J<-P9 vk+
Candela Options dialog box. The iso-candela plots can be presented as false I
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color maps or contour plots. The distribution plots are graphs of cross-sectional P *%bG 4
curves through the candela distribution. 8<_WtDg
The orientation of the candela plots is determined by the Normal Vector and the UejG$JyHP
Up Vector, as specified in the Analysis|Candela Options dialog box. The S3 x:]E:
normal vector specifies the axis of the candela plot and the up vector specifies d(]LRIn~1
“which way is up.”
