给个英文的.个人理解可能会有点出入.基本上是这个意思. <lB2Nv -,
4(\1z6?D
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric }#1. $a
units, a luminous intensity plot is in units of candelas (lumens per steradian). In wwl,F=| Y
radiometric units, an intensity plot is in units of watts per steradian. Candela plots )FwOg;=3M"
are commonly used in the design of illumination systems, especially those used in ftY&Q#[
the far field. R"OT&:0/
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface `:lcN0n
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” B <s+I#
the model and “go off to infinity.” Exiting rays are the collection of ray segments lB27Z}
following the intersection point of a ray at a surface. Due to ray splitting, several Qb@j8Xa4[
ray segments may contribute to the candela data for each incident ray. Incident ) , {3LIr
rays are the collection of ray segments which intersect the selected surface. No #N`'hPD}
surface selection is required for Missed rays but one is necessary for Exiting and @ fMlbJq
Incident rays. 0c>>:w20D
The candela plots represent flux versus angle and can be smoothed using the r^ "o!,H9q
Candela Options dialog box. The iso-candela plots can be presented as false b!g)/ %C
color maps or contour plots. The distribution plots are graphs of cross-sectional aKMX-?%t4
curves through the candela distribution. ~"S5KroN
The orientation of the candela plots is determined by the Normal Vector and the +_:p8,
5o
Up Vector, as specified in the Analysis|Candela Options dialog box. The !&OdbRHM
normal vector specifies the axis of the candela plot and the up vector specifies W 4 q9pHQ
“which way is up.”
