给个英文的.个人理解可能会有点出入.基本上是这个意思. :&Qb>PH[
9aT L22U?
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric )r ULT$;i@
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ^ [ET&"
radiometric units, an intensity plot is in units of watts per steradian. Candela plots T1l&B
are commonly used in the design of illumination systems, especially those used in >HE,'
the far field. `Jn,IDq
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface n4 ^*h4J7
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” N g58/}zO
the model and “go off to infinity.” Exiting rays are the collection of ray segments 6dF$?I&
following the intersection point of a ray at a surface. Due to ray splitting, several |}Q( F+cL
ray segments may contribute to the candela data for each incident ray. Incident m'd^ ?Qc
rays are the collection of ray segments which intersect the selected surface. No g<f P:/
surface selection is required for Missed rays but one is necessary for Exiting and SEYG y+#K
Incident rays. SV& kWbS
The candela plots represent flux versus angle and can be smoothed using the P?uf?{
Candela Options dialog box. The iso-candela plots can be presented as false Y mq3ty]Pe
color maps or contour plots. The distribution plots are graphs of cross-sectional \ 0D$Mie
curves through the candela distribution. TW>?h=.z
The orientation of the candela plots is determined by the Normal Vector and the (G#} *
Up Vector, as specified in the Analysis|Candela Options dialog box. The >&BrCu[u
normal vector specifies the axis of the candela plot and the up vector specifies [d}qG#N
“which way is up.”
