给个英文的.个人理解可能会有点出入.基本上是这个意思. =o& >fw
o]; [R
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric fjs
[f'L
units, a luminous intensity plot is in units of candelas (lumens per steradian). In =8; {\
radiometric units, an intensity plot is in units of watts per steradian. Candela plots UrYZ` J
are commonly used in the design of illumination systems, especially those used in :=wT vz
the far field. b\-&sM(W"
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface wnM 9('\
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” DDPxmuNG
the model and “go off to infinity.” Exiting rays are the collection of ray segments ]3K hgK%c8
following the intersection point of a ray at a surface. Due to ray splitting, several ~% SH3$
ray segments may contribute to the candela data for each incident ray. Incident Z;:u'=
rays are the collection of ray segments which intersect the selected surface. No d5D$&5Ec
surface selection is required for Missed rays but one is necessary for Exiting and kH]yl
2
Incident rays. <;#~l*
The candela plots represent flux versus angle and can be smoothed using the <iH`rP#
Candela Options dialog box. The iso-candela plots can be presented as false -3;*K4z$/
color maps or contour plots. The distribution plots are graphs of cross-sectional h $L/<3oP6
curves through the candela distribution. ML(
E o
The orientation of the candela plots is determined by the Normal Vector and the YRh B RE
Up Vector, as specified in the Analysis|Candela Options dialog box. The t4-pM1]1_
normal vector specifies the axis of the candela plot and the up vector specifies (&+kl q
“which way is up.”
