给个英文的.个人理解可能会有点出入.基本上是这个意思. c'678!r9 P
M[Kk43;QY!
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric cl4Vi%
units, a luminous intensity plot is in units of candelas (lumens per steradian). In )(Z)yz
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Z Rjqjx
are commonly used in the design of illumination systems, especially those used in B!#F!Wk"
the far field. 5 GwXZ;(G
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface <gdKuoY
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” Gz>M`M`[4
the model and “go off to infinity.” Exiting rays are the collection of ray segments syseYt]
following the intersection point of a ray at a surface. Due to ray splitting, several RyxEZ7dC<y
ray segments may contribute to the candela data for each incident ray. Incident v+3-o/G7
rays are the collection of ray segments which intersect the selected surface. No L &i _
surface selection is required for Missed rays but one is necessary for Exiting and bay7%[BLB
Incident rays. P/'9k0zs)
The candela plots represent flux versus angle and can be smoothed using the =36e&z-#
Candela Options dialog box. The iso-candela plots can be presented as false EK-Qa<[|
color maps or contour plots. The distribution plots are graphs of cross-sectional mJ>@Dh3>G
curves through the candela distribution. $?dAO}f3O)
The orientation of the candela plots is determined by the Normal Vector and the v7L} I[f
Up Vector, as specified in the Analysis|Candela Options dialog box. The uAWmg8
normal vector specifies the axis of the candela plot and the up vector specifies #ilU(39e
“which way is up.”
