给个英文的.个人理解可能会有点出入.基本上是这个意思. =xk>yw!O)
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric }a" =K%b<\
units, a luminous intensity plot is in units of candelas (lumens per steradian). In qiz(k:\o
radiometric units, an intensity plot is in units of watts per steradian. Candela plots B^2r4
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are commonly used in the design of illumination systems, especially those used in Snkb ^Kt
the far field. Uu7]`U l
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Xt$qj tVM
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 6ALjM-t=V
the model and “go off to infinity.” Exiting rays are the collection of ray segments @b(@`yz.a
following the intersection point of a ray at a surface. Due to ray splitting, several 1>*oN
ray segments may contribute to the candela data for each incident ray. Incident tddwnpnSw
rays are the collection of ray segments which intersect the selected surface. No gS FZ>v*6
surface selection is required for Missed rays but one is necessary for Exiting and =z. hJu
Incident rays. ?`+VWa[,e
The candela plots represent flux versus angle and can be smoothed using the -6)n QNj|
Candela Options dialog box. The iso-candela plots can be presented as false %n$f#Ml_r
color maps or contour plots. The distribution plots are graphs of cross-sectional Ta[2uv>
curves through the candela distribution. onu G
The orientation of the candela plots is determined by the Normal Vector and the 3EY Ed39E
Up Vector, as specified in the Analysis|Candela Options dialog box. The L2@:?WW[
normal vector specifies the axis of the candela plot and the up vector specifies #Us<#"fC
“which way is up.”
