给个英文的.个人理解可能会有点出入.基本上是这个意思.
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric % < *g!y `
units, a luminous intensity plot is in units of candelas (lumens per steradian). In @u]rWVy;\[
radiometric units, an intensity plot is in units of watts per steradian. Candela plots P5nO78
are commonly used in the design of illumination systems, especially those used in 72y0/ FJ
the far field. ZR]25Y y
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface $?<Z!*x
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” W!&'pg
the model and “go off to infinity.” Exiting rays are the collection of ray segments k+C zj
following the intersection point of a ray at a surface. Due to ray splitting, several DSk/q-'u
ray segments may contribute to the candela data for each incident ray. Incident (Dl$k Gn
rays are the collection of ray segments which intersect the selected surface. No L3 --r
surface selection is required for Missed rays but one is necessary for Exiting and ZUR6n>r
Incident rays. S.m{eur!,E
The candela plots represent flux versus angle and can be smoothed using the ^,8)iV0j_
Candela Options dialog box. The iso-candela plots can be presented as false *q".-u!D[
color maps or contour plots. The distribution plots are graphs of cross-sectional | >htvDL
curves through the candela distribution. TDNQu_E
The orientation of the candela plots is determined by the Normal Vector and the pd7NF-KD
Up Vector, as specified in the Analysis|Candela Options dialog box. The
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normal vector specifies the axis of the candela plot and the up vector specifies WP+oFkw>
“which way is up.”
