给个英文的.个人理解可能会有点出入.基本上是这个意思. w
tSX(LN Y
7v]9) W=y
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric `RHhc{
units, a luminous intensity plot is in units of candelas (lumens per steradian). In <:ptNGR
radiometric units, an intensity plot is in units of watts per steradian. Candela plots b`&
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are commonly used in the design of illumination systems, especially those used in zTS P8Q7
the far field. ":W$$w<
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface @5tGI U;1
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” kG>m(n
the model and “go off to infinity.” Exiting rays are the collection of ray segments JxmFUheLt
following the intersection point of a ray at a surface. Due to ray splitting, several (,^j gv|I
ray segments may contribute to the candela data for each incident ray. Incident UiQF4Uc"
rays are the collection of ray segments which intersect the selected surface. No 7
V3r!y
surface selection is required for Missed rays but one is necessary for Exiting and QA=mD^A
Incident rays. &e)V!o@wJV
The candela plots represent flux versus angle and can be smoothed using the Z# o;H$
Candela Options dialog box. The iso-candela plots can be presented as false Bv{DZ?{s
color maps or contour plots. The distribution plots are graphs of cross-sectional O/Mx $Q3re
curves through the candela distribution. je WI<ms
The orientation of the candela plots is determined by the Normal Vector and the e +O502]
Up Vector, as specified in the Analysis|Candela Options dialog box. The y134m
normal vector specifies the axis of the candela plot and the up vector specifies we&D"V
“which way is up.”
