给个英文的.个人理解可能会有点出入.基本上是这个意思. `~3y[j]kO
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric o]*#|4-
units, a luminous intensity plot is in units of candelas (lumens per steradian). In < ekLL{/O'
radiometric units, an intensity plot is in units of watts per steradian. Candela plots |d8x55dk
are commonly used in the design of illumination systems, especially those used in ;7 Y4 v`m
the far field. U*6)/.J
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface <O?UC/$)7
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” | sio:QP
the model and “go off to infinity.” Exiting rays are the collection of ray segments d$` N Apr
following the intersection point of a ray at a surface. Due to ray splitting, several t<2B3&o1
ray segments may contribute to the candela data for each incident ray. Incident !G3d5d2)C
rays are the collection of ray segments which intersect the selected surface. No 9W <I~
surface selection is required for Missed rays but one is necessary for Exiting and }EZd=_kAq~
Incident rays. Z6 `[ dAo
The candela plots represent flux versus angle and can be smoothed using the >A;9Ee "&
Candela Options dialog box. The iso-candela plots can be presented as false 564)ha/^(
color maps or contour plots. The distribution plots are graphs of cross-sectional 1tQl^ >r16
curves through the candela distribution. IvyBK]{|
The orientation of the candela plots is determined by the Normal Vector and the x:)8+Rn}
Up Vector, as specified in the Analysis|Candela Options dialog box. The AGxG*Ku Z
normal vector specifies the axis of the candela plot and the up vector specifies +8 AGs,
“which way is up.”
