给个英文的.个人理解可能会有点出入.基本上是这个意思. #uFP
eu:
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric llI`"a
units, a luminous intensity plot is in units of candelas (lumens per steradian). In rFdovfb
radiometric units, an intensity plot is in units of watts per steradian. Candela plots bf::bV?T
are commonly used in the design of illumination systems, especially those used in rT5dv3^MW!
the far field. mZ*!$P:vy"
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface #(!>
or rays Incident on a surface. Missed rays are a collection of all rays that “leave”
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the model and “go off to infinity.” Exiting rays are the collection of ray segments e=TB/W_
following the intersection point of a ray at a surface. Due to ray splitting, several 3 fM~R+p
ray segments may contribute to the candela data for each incident ray. Incident hcwK i
rays are the collection of ray segments which intersect the selected surface. No h_Q9 c
surface selection is required for Missed rays but one is necessary for Exiting and hQPiGIs
Incident rays. r#3(;N{=
The candela plots represent flux versus angle and can be smoothed using the k)d LJ<EM
Candela Options dialog box. The iso-candela plots can be presented as false vt@.fT#e
color maps or contour plots. The distribution plots are graphs of cross-sectional KK}^E_v
curves through the candela distribution. X .bNU
The orientation of the candela plots is determined by the Normal Vector and the )<t5' +d%
Up Vector, as specified in the Analysis|Candela Options dialog box. The Mb uD8 B
normal vector specifies the axis of the candela plot and the up vector specifies Z6A*9m
“which way is up.”
