给个英文的.个人理解可能会有点出入.基本上是这个意思. S0LszW)e
`*yAiv>
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric XlkGjjW#/J
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ooE{V*Ie
radiometric units, an intensity plot is in units of watts per steradian. Candela plots 3t aa^e.
are commonly used in the design of illumination systems, especially those used in ]1sNmi$T
the far field. [se^.[0,
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Oq+E6"<y;?
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” %{C)1*M7
the model and “go off to infinity.” Exiting rays are the collection of ray segments t3b@P4c \
following the intersection point of a ray at a surface. Due to ray splitting, several `FJ|W6%
ray segments may contribute to the candela data for each incident ray. Incident *eUc.MX6x
rays are the collection of ray segments which intersect the selected surface. No _]| Qec)
surface selection is required for Missed rays but one is necessary for Exiting and G {b:i8}l
Incident rays. V=}1[^
The candela plots represent flux versus angle and can be smoothed using the >F3.c%VU]w
Candela Options dialog box. The iso-candela plots can be presented as false A#DR9Eq
color maps or contour plots. The distribution plots are graphs of cross-sectional |RhM| i
curves through the candela distribution. I:$"E%
>=
The orientation of the candela plots is determined by the Normal Vector and the +\`rmI
Up Vector, as specified in the Analysis|Candela Options dialog box. The M"U OgS
normal vector specifies the axis of the candela plot and the up vector specifies M35Ax],:^
“which way is up.”
