给个英文的.个人理解可能会有点出入.基本上是这个意思. DrioBb@
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric m44a HBwId
units, a luminous intensity plot is in units of candelas (lumens per steradian). In AWMJ/ E*T
radiometric units, an intensity plot is in units of watts per steradian. Candela plots R@pY+d9qp
are commonly used in the design of illumination systems, especially those used in _[E+D0A
the far field. <)!,$]S
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface {K"hl u[
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” =+mb@#="m
the model and “go off to infinity.” Exiting rays are the collection of ray segments >EFWevT{
following the intersection point of a ray at a surface. Due to ray splitting, several $+n6V2^K)7
ray segments may contribute to the candela data for each incident ray. Incident /i27F2NQm
rays are the collection of ray segments which intersect the selected surface. No #\=7 A
surface selection is required for Missed rays but one is necessary for Exiting and ff R%@
Incident rays. <},JWV3
The candela plots represent flux versus angle and can be smoothed using the LWTPNp:"{w
Candela Options dialog box. The iso-candela plots can be presented as false >P@V D"U
color maps or contour plots. The distribution plots are graphs of cross-sectional ^Y+C!I
curves through the candela distribution. Xj{fM\,"9
The orientation of the candela plots is determined by the Normal Vector and the 6i+,/v r
Up Vector, as specified in the Analysis|Candela Options dialog box. The a9p:k
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normal vector specifies the axis of the candela plot and the up vector specifies y2jw3R
“which way is up.”
