给个英文的.个人理解可能会有点出入.基本上是这个意思. v.I >B3bEg
DJhCe==$v
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ;GxKPy
units, a luminous intensity plot is in units of candelas (lumens per steradian). In I_@XHhyVZ
radiometric units, an intensity plot is in units of watts per steradian. Candela plots KrT+Svm
are commonly used in the design of illumination systems, especially those used in U ()36
the far field. sHulaX{
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface {e8.E<f-
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” m-No 8)2yA
the model and “go off to infinity.” Exiting rays are the collection of ray segments cO
!2|v8i
following the intersection point of a ray at a surface. Due to ray splitting, several "8Y4;lbN.q
ray segments may contribute to the candela data for each incident ray. Incident qS|t7 *
rays are the collection of ray segments which intersect the selected surface. No 3 a G?^z
surface selection is required for Missed rays but one is necessary for Exiting and 'PrrP3lO_~
Incident rays. ,;yiV<AD
The candela plots represent flux versus angle and can be smoothed using the E7qk>~Dg
Candela Options dialog box. The iso-candela plots can be presented as false cUz7F
color maps or contour plots. The distribution plots are graphs of cross-sectional <ibEo98
curves through the candela distribution. Mrlv(1PQT
The orientation of the candela plots is determined by the Normal Vector and the k:0HsN!F9
Up Vector, as specified in the Analysis|Candela Options dialog box. The Cuq=>J
normal vector specifies the axis of the candela plot and the up vector specifies Y_49Ut JIg
“which way is up.”
