给个英文的.个人理解可能会有点出入.基本上是这个意思. dU.H9\p
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric IgNL1KRD
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ";*Iwd*V
radiometric units, an intensity plot is in units of watts per steradian. Candela plots p -wEPC 0
are commonly used in the design of illumination systems, especially those used in w<jlE8u
the far field. D)GD9MJ
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” M2rgB%W)m
the model and “go off to infinity.” Exiting rays are the collection of ray segments 2>h. K/pC
following the intersection point of a ray at a surface. Due to ray splitting, several 2 `nOYK
ray segments may contribute to the candela data for each incident ray. Incident g/BlTi
rays are the collection of ray segments which intersect the selected surface. No jQi)pV T^
surface selection is required for Missed rays but one is necessary for Exiting and BiI`o CX
Incident rays. , %U'>F?
The candela plots represent flux versus angle and can be smoothed using the Xw]L'+V=
Candela Options dialog box. The iso-candela plots can be presented as false H-'~c \ )
color maps or contour plots. The distribution plots are graphs of cross-sectional .!yw@kg
curves through the candela distribution. yGX"1Fb?;x
The orientation of the candela plots is determined by the Normal Vector and the FWl'='5L
Up Vector, as specified in the Analysis|Candela Options dialog box. The RJ~I?{yR0[
normal vector specifies the axis of the candela plot and the up vector specifies [.LbX`K:
“which way is up.”
