给个英文的.个人理解可能会有点出入.基本上是这个意思. [zsUboCkc
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric NQu.%=
units, a luminous intensity plot is in units of candelas (lumens per steradian). In tMDJ,rT
radiometric units, an intensity plot is in units of watts per steradian. Candela plots >2BWie?T
are commonly used in the design of illumination systems, especially those used in ygo4.
the far field. ~C31=\$
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface fP>~ @^
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ,u@Vi0
the model and “go off to infinity.” Exiting rays are the collection of ray segments TO5#iiM)
following the intersection point of a ray at a surface. Due to ray splitting, several ?igA+(.
ray segments may contribute to the candela data for each incident ray. Incident gCjW !t
rays are the collection of ray segments which intersect the selected surface. No oQL$X3S
surface selection is required for Missed rays but one is necessary for Exiting and T?e(m
Incident rays. l+XTn;cS
The candela plots represent flux versus angle and can be smoothed using the =#so[Pd
Candela Options dialog box. The iso-candela plots can be presented as false VNT*@^O_=
color maps or contour plots. The distribution plots are graphs of cross-sectional 7]F@g}8
curves through the candela distribution. xN +Oca
The orientation of the candela plots is determined by the Normal Vector and the 3IyNnm=u
Up Vector, as specified in the Analysis|Candela Options dialog box. The O]cuJp
normal vector specifies the axis of the candela plot and the up vector specifies /BQB7vL
“which way is up.”