给个英文的.个人理解可能会有点出入.基本上是这个意思. iM|"H..
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 8I\er omG
units, a luminous intensity plot is in units of candelas (lumens per steradian). In Hu9R.[u
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ; eF4J
are commonly used in the design of illumination systems, especially those used in P%`R7yk
the far field. oPu|Q^I=
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface V$<G)dwUG5
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” S"^KJUUc
the model and “go off to infinity.” Exiting rays are the collection of ray segments ]KK ZbEO
following the intersection point of a ray at a surface. Due to ray splitting, several : a q>
ray segments may contribute to the candela data for each incident ray. Incident <
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rays are the collection of ray segments which intersect the selected surface. No fuD1U}c
surface selection is required for Missed rays but one is necessary for Exiting and LAY)">*49H
Incident rays. oT)V OkFq
The candela plots represent flux versus angle and can be smoothed using the gZ" {{#:}
Candela Options dialog box. The iso-candela plots can be presented as false KTK6#[8A
color maps or contour plots. The distribution plots are graphs of cross-sectional boF4d'g"
curves through the candela distribution. q 9 brpbg_
The orientation of the candela plots is determined by the Normal Vector and the 5uV"g5?w
Up Vector, as specified in the Analysis|Candela Options dialog box. The 6eUiI@J
normal vector specifies the axis of the candela plot and the up vector specifies Ac!&j=ZE
“which way is up.”
