给个英文的.个人理解可能会有点出入.基本上是这个意思. h/l?,7KHI
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric - 1!s8G
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 1Imb"E
radiometric units, an intensity plot is in units of watts per steradian. Candela plots q kyYt#4E
are commonly used in the design of illumination systems, especially those used in eR8>5:V_
the far field. sy9Yd PPE
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface T~N87 7
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Nk>6:Ho{G
the model and “go off to infinity.” Exiting rays are the collection of ray segments _lk5 \bu
following the intersection point of a ray at a surface. Due to ray splitting, several K;f=l5
ray segments may contribute to the candela data for each incident ray. Incident k1WyV_3
rays are the collection of ray segments which intersect the selected surface. No RKz _GEH)
surface selection is required for Missed rays but one is necessary for Exiting and 3dI(gm 6
Incident rays. OoAZ t
The candela plots represent flux versus angle and can be smoothed using the tbi(e49S
Candela Options dialog box. The iso-candela plots can be presented as false 'seuO!5
color maps or contour plots. The distribution plots are graphs of cross-sectional [WunA,IuR
curves through the candela distribution. 6HR*)*>z_
The orientation of the candela plots is determined by the Normal Vector and the TGPHjSZ1
Up Vector, as specified in the Analysis|Candela Options dialog box. The &[}5yos
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normal vector specifies the axis of the candela plot and the up vector specifies ngaQa-8w
“which way is up.”
