给个英文的.个人理解可能会有点出入.基本上是这个意思. Z>a_vC
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric /'G'GQrr
units, a luminous intensity plot is in units of candelas (lumens per steradian). In _3T*[s;H
radiometric units, an intensity plot is in units of watts per steradian. Candela plots +U^dllL7
are commonly used in the design of illumination systems, especially those used in ']f]:X;6 w
the far field. uavts9v<
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface gsc*![N
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ls,gQ]B:P
the model and “go off to infinity.” Exiting rays are the collection of ray segments ;4F[*VF !w
following the intersection point of a ray at a surface. Due to ray splitting, several 7% 8,*T
ray segments may contribute to the candela data for each incident ray. Incident QA.B.U7!
rays are the collection of ray segments which intersect the selected surface. No (E U X>IJ
surface selection is required for Missed rays but one is necessary for Exiting and sb(,w
Incident rays. )TM ![^d
The candela plots represent flux versus angle and can be smoothed using the
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Candela Options dialog box. The iso-candela plots can be presented as false }tx~y-QQ
color maps or contour plots. The distribution plots are graphs of cross-sectional {C*mn !u
curves through the candela distribution. i(,R$AU
The orientation of the candela plots is determined by the Normal Vector and the xVKx#X9yk
Up Vector, as specified in the Analysis|Candela Options dialog box. The "S[VtuxPCU
normal vector specifies the axis of the candela plot and the up vector specifies 4cJ7.Pez
“which way is up.”
