给个英文的.个人理解可能会有点出入.基本上是这个意思. L"Qh_ +
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric \[@ Q}k[
units, a luminous intensity plot is in units of candelas (lumens per steradian). In CsJ )Z%4_
radiometric units, an intensity plot is in units of watts per steradian. Candela plots :;" aUHU'
are commonly used in the design of illumination systems, especially those used in Eqz4{\
the far field. .Z(S4wV
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Xtu:
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” HA$^ *qn
the model and “go off to infinity.” Exiting rays are the collection of ray segments 5K L9$J9k
following the intersection point of a ray at a surface. Due to ray splitting, several xn%l
ray segments may contribute to the candela data for each incident ray. Incident o(B<!ji~'
rays are the collection of ray segments which intersect the selected surface. No ;zf Q3$@9
surface selection is required for Missed rays but one is necessary for Exiting and
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Incident rays. S3j]{pZ(z
The candela plots represent flux versus angle and can be smoothed using the :t2 9`x
Candela Options dialog box. The iso-candela plots can be presented as false ga LEhf^
color maps or contour plots. The distribution plots are graphs of cross-sectional c9Y2eetO
curves through the candela distribution. ^yEj]]6
The orientation of the candela plots is determined by the Normal Vector and the o 2[vM$]
Up Vector, as specified in the Analysis|Candela Options dialog box. The : ;E7+m
normal vector specifies the axis of the candela plot and the up vector specifies UFzM#
“which way is up.”
