给个英文的.个人理解可能会有点出入.基本上是这个意思. `<I+(8]Uz
O`2;n.>\
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Kyy CS>
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ]^HlI4 z
radiometric units, an intensity plot is in units of watts per steradian. Candela plots '1?b ?nVo
are commonly used in the design of illumination systems, especially those used in 8 VMe#41
the far field. JTu^p]os?
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface YGVj$\
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” O ][R "5d
the model and “go off to infinity.” Exiting rays are the collection of ray segments D[)
Z$+D4f
following the intersection point of a ray at a surface. Due to ray splitting, several C[h"w'A2
ray segments may contribute to the candela data for each incident ray. Incident 6onFf* m!x
rays are the collection of ray segments which intersect the selected surface. No T/NeoU3 p
surface selection is required for Missed rays but one is necessary for Exiting and v]CH
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Incident rays. 2CX'J8Sy
The candela plots represent flux versus angle and can be smoothed using the #Z8=z*4
Candela Options dialog box. The iso-candela plots can be presented as false 7hPiPv
color maps or contour plots. The distribution plots are graphs of cross-sectional uW*)B_c
curves through the candela distribution.
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The orientation of the candela plots is determined by the Normal Vector and the , VT&
Up Vector, as specified in the Analysis|Candela Options dialog box. The s)HLFdis @
normal vector specifies the axis of the candela plot and the up vector specifies 9&R. <I
“which way is up.”
