给个英文的.个人理解可能会有点出入.基本上是这个意思. U%vTmdOY
r5j$FwY
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric |V3 4;} \4
units, a luminous intensity plot is in units of candelas (lumens per steradian). In WuK<?1meN
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ,6+j oKe-
are commonly used in the design of illumination systems, especially those used in ,M .C]6YMr
the far field. eT%x(P
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface {6u)EJ
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” {a[BhK'g
the model and “go off to infinity.” Exiting rays are the collection of ray segments ILuQ.VhBVN
following the intersection point of a ray at a surface. Due to ray splitting, several 0AM_D >fH
ray segments may contribute to the candela data for each incident ray. Incident hb3n-
r O
rays are the collection of ray segments which intersect the selected surface. No ,:Px(= d4
surface selection is required for Missed rays but one is necessary for Exiting and n@pwOHQn<|
Incident rays. JC '3x9_<z
The candela plots represent flux versus angle and can be smoothed using the C PZ{
Candela Options dialog box. The iso-candela plots can be presented as false 5*z>ez2YQ7
color maps or contour plots. The distribution plots are graphs of cross-sectional <E C"E #p
curves through the candela distribution. ;f%@s1u
The orientation of the candela plots is determined by the Normal Vector and the Hzz{wY
Up Vector, as specified in the Analysis|Candela Options dialog box. The YdD; Qx #O
normal vector specifies the axis of the candela plot and the up vector specifies ?0~g1"Y-*K
“which way is up.”
