给个英文的.个人理解可能会有点出入.基本上是这个意思. zFGZ;?i
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric bF{14F$
units, a luminous intensity plot is in units of candelas (lumens per steradian). In DeL7sU
radiometric units, an intensity plot is in units of watts per steradian. Candela plots |h75S.UY
are commonly used in the design of illumination systems, especially those used in bx8 |_K*^
the far field. <-m?l6
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface R'{BkC}.
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” }! 0nb)kL
the model and “go off to infinity.” Exiting rays are the collection of ray segments _b1w<T
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following the intersection point of a ray at a surface. Due to ray splitting, several 4?F7% ^vr
ray segments may contribute to the candela data for each incident ray. Incident F3V_rE<
rays are the collection of ray segments which intersect the selected surface. No .j_YVYu1&
surface selection is required for Missed rays but one is necessary for Exiting and U,)@+?U+h
Incident rays. < &~KYu\r
The candela plots represent flux versus angle and can be smoothed using the [MVG\6Up(
Candela Options dialog box. The iso-candela plots can be presented as false I%fz^:[#<
color maps or contour plots. The distribution plots are graphs of cross-sectional ;~5w`F)
curves through the candela distribution. ^qD@qJ
The orientation of the candela plots is determined by the Normal Vector and the = ;"$t_t
Up Vector, as specified in the Analysis|Candela Options dialog box. The 3gzcpFNqX
normal vector specifies the axis of the candela plot and the up vector specifies d)X6x-(
“which way is up.”
