给个英文的.个人理解可能会有点出入.基本上是这个意思. 3=!\>0;E-
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric |F3 6 ^
units, a luminous intensity plot is in units of candelas (lumens per steradian). In z BWn*A[4
radiometric units, an intensity plot is in units of watts per steradian. Candela plots D_ ,}lsrb
are commonly used in the design of illumination systems, especially those used in gIS<"smOo
the far field. ukV1_QeN [
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface qw[)$icP
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” d$<HMs:o@
the model and “go off to infinity.” Exiting rays are the collection of ray segments >JVZ@
PV
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following the intersection point of a ray at a surface. Due to ray splitting, several s OD>mc#%Y
ray segments may contribute to the candela data for each incident ray. Incident VsOn j~@
rays are the collection of ray segments which intersect the selected surface. No :)+|q
surface selection is required for Missed rays but one is necessary for Exiting and C7&4, ],
Incident rays. sfez0Uqe.~
The candela plots represent flux versus angle and can be smoothed using the * a xOen
Candela Options dialog box. The iso-candela plots can be presented as false I%(`2 rD8G
color maps or contour plots. The distribution plots are graphs of cross-sectional wm |{@z
curves through the candela distribution. +*[lp@zU{
The orientation of the candela plots is determined by the Normal Vector and the q4$zsw
Up Vector, as specified in the Analysis|Candela Options dialog box. The bH+p5Fd;
normal vector specifies the axis of the candela plot and the up vector specifies b, YTw
“which way is up.”
