给个英文的.个人理解可能会有点出入.基本上是这个意思. wa T'|9{
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Gl ; xd
units, a luminous intensity plot is in units of candelas (lumens per steradian). In _c$l@8KS^
radiometric units, an intensity plot is in units of watts per steradian. Candela plots P'l'[Kz{'
are commonly used in the design of illumination systems, especially those used in EX@wenR
the far field. X\sO eb:]
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface =#L\fe)q)
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 1u>[0<U~E
the model and “go off to infinity.” Exiting rays are the collection of ray segments %dn!$ [D@
following the intersection point of a ray at a surface. Due to ray splitting, several s3<gq x-&r
ray segments may contribute to the candela data for each incident ray. Incident GO4IAUA
rays are the collection of ray segments which intersect the selected surface. No lrQNl^K }=
surface selection is required for Missed rays but one is necessary for Exiting and lZ gX{
Incident rays. )seeBm-`
The candela plots represent flux versus angle and can be smoothed using the @-zL"%%dw'
Candela Options dialog box. The iso-candela plots can be presented as false FWC\(f
color maps or contour plots. The distribution plots are graphs of cross-sectional F)K&a
curves through the candela distribution. ^jh c(ZW"
The orientation of the candela plots is determined by the Normal Vector and the U</Vcz
Up Vector, as specified in the Analysis|Candela Options dialog box. The BLaF++Fop
normal vector specifies the axis of the candela plot and the up vector specifies Y.yiUf/Q
“which way is up.”
