给个英文的.个人理解可能会有点出入.基本上是这个意思. s9qr;}U.`
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 9pStArF?F0
units, a luminous intensity plot is in units of candelas (lumens per steradian). In +WK!}xZR
radiometric units, an intensity plot is in units of watts per steradian. Candela plots . 5|wy<
are commonly used in the design of illumination systems, especially those used in &K )c*' l
the far field. O h~J yrZy
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface +D`IcR-x
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” <;+&` R
the model and “go off to infinity.” Exiting rays are the collection of ray segments
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following the intersection point of a ray at a surface. Due to ray splitting, several \Q?r+VZ
ray segments may contribute to the candela data for each incident ray. Incident ?^2(|t9KU
rays are the collection of ray segments which intersect the selected surface. No 4&r^mGs,
surface selection is required for Missed rays but one is necessary for Exiting and hFZ7{pj
Incident rays. D^ I%tn=F
The candela plots represent flux versus angle and can be smoothed using the G*mk 19Z
Candela Options dialog box. The iso-candela plots can be presented as false ?A2# V(4
color maps or contour plots. The distribution plots are graphs of cross-sectional 4iRcmsP
curves through the candela distribution. ]U! ?{~
The orientation of the candela plots is determined by the Normal Vector and the B@A3T8'
Up Vector, as specified in the Analysis|Candela Options dialog box. The :Y0*P
normal vector specifies the axis of the candela plot and the up vector specifies -2w\8]u
“which way is up.”
