给个英文的.个人理解可能会有点出入.基本上是这个意思. *GB$sXF
+._f.BRmX.
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric HX z iD nj
units, a luminous intensity plot is in units of candelas (lumens per steradian). In S:DcfR=a
radiometric units, an intensity plot is in units of watts per steradian. Candela plots aj+zmk~-
are commonly used in the design of illumination systems, especially those used in i,^>uf
the far field. $4& 8U ~Zs
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface VN1# 8{
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” XP3QBq
the model and “go off to infinity.” Exiting rays are the collection of ray segments ei(| 5h
following the intersection point of a ray at a surface. Due to ray splitting, several ,(zcl$A[
ray segments may contribute to the candela data for each incident ray. Incident B&to&|jf
rays are the collection of ray segments which intersect the selected surface. No 4ZSfz#<[z
surface selection is required for Missed rays but one is necessary for Exiting and ~l y`u
Incident rays. GXGN;,7EV
The candela plots represent flux versus angle and can be smoothed using the h:eN>yW
Candela Options dialog box. The iso-candela plots can be presented as false }"!6 Xm
color maps or contour plots. The distribution plots are graphs of cross-sectional w?*'vF_2:#
curves through the candela distribution. Z z{[Al{
The orientation of the candela plots is determined by the Normal Vector and the 5Q Cw5N
Up Vector, as specified in the Analysis|Candela Options dialog box. The ]M02>=1
normal vector specifies the axis of the candela plot and the up vector specifies |Sy}d[VKsZ
“which way is up.”
