给个英文的.个人理解可能会有点出入.基本上是这个意思. ? qPo=~y01
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric |:nn>E}ZA/
units, a luminous intensity plot is in units of candelas (lumens per steradian). In smlpD3? va
radiometric units, an intensity plot is in units of watts per steradian. Candela plots "|EM;o
are commonly used in the design of illumination systems, especially those used in B,?T %
the far field. x-$&g*<
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface KI)M JG:t
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” C[ NS kr
the model and “go off to infinity.” Exiting rays are the collection of ray segments [4YTDEv%
following the intersection point of a ray at a surface. Due to ray splitting, several ]O]4z,n
ray segments may contribute to the candela data for each incident ray. Incident J[l7di5
rays are the collection of ray segments which intersect the selected surface. No r(:5kC8 K
surface selection is required for Missed rays but one is necessary for Exiting and U;YC}r
Incident rays. N-G1h?e4
The candela plots represent flux versus angle and can be smoothed using the * aN
Candela Options dialog box. The iso-candela plots can be presented as false RSfQNc9Z
color maps or contour plots. The distribution plots are graphs of cross-sectional qB5j;@ r
curves through the candela distribution. y&6F ybIz
The orientation of the candela plots is determined by the Normal Vector and the Vx$ \hcG
Up Vector, as specified in the Analysis|Candela Options dialog box. The S=MEG+Ad
normal vector specifies the axis of the candela plot and the up vector specifies *w|:~g
“which way is up.”
