给个英文的.个人理解可能会有点出入.基本上是这个意思. gF sqCx<q
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric Udq!YXE0
units, a luminous intensity plot is in units of candelas (lumens per steradian). In mi[8O$^iJ
radiometric units, an intensity plot is in units of watts per steradian. Candela plots /Q_ Dd
are commonly used in the design of illumination systems, especially those used in ;%;||?'v
the far field. Xt
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Candela data can be collected from ray sets of Missed rays, rays Exiting a surface GxEShSGOE
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” m=SI *V
the model and “go off to infinity.” Exiting rays are the collection of ray segments +}PN+:yV
following the intersection point of a ray at a surface. Due to ray splitting, several iu3L9UfL[
ray segments may contribute to the candela data for each incident ray. Incident nv\K!wZI=b
rays are the collection of ray segments which intersect the selected surface. No 7Gy:T47T\@
surface selection is required for Missed rays but one is necessary for Exiting and Ov ^##E
Incident rays. uqLP$At
The candela plots represent flux versus angle and can be smoothed using the 7*"Jx}eM
Candela Options dialog box. The iso-candela plots can be presented as false mh y='AQJ
color maps or contour plots. The distribution plots are graphs of cross-sectional E X#AJ>?V(
curves through the candela distribution. X-#&]^d
The orientation of the candela plots is determined by the Normal Vector and the ESYF4-d +
Up Vector, as specified in the Analysis|Candela Options dialog box. The >F s/Wet
normal vector specifies the axis of the candela plot and the up vector specifies *ifz@8C }
“which way is up.”
