给个英文的.个人理解可能会有点出入.基本上是这个意思. l:
X]$2;
? W`?F
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric a}]zwV&
units, a luminous intensity plot is in units of candelas (lumens per steradian). In v\ gCgx=%j
radiometric units, an intensity plot is in units of watts per steradian. Candela plots Mk"V%)1k
are commonly used in the design of illumination systems, especially those used in // \UthOT
the far field. ;q6FdS
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface %}%vey
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” ;}=[( eqA
the model and “go off to infinity.” Exiting rays are the collection of ray segments 8LouCv(>
following the intersection point of a ray at a surface. Due to ray splitting, several T-L; iH~0
ray segments may contribute to the candela data for each incident ray. Incident hc4W|Ofj
rays are the collection of ray segments which intersect the selected surface. No |K%nVcR=
surface selection is required for Missed rays but one is necessary for Exiting and ,'69RL?-Wg
Incident rays. )^o7%K X
The candela plots represent flux versus angle and can be smoothed using the Q<F-l. q
Candela Options dialog box. The iso-candela plots can be presented as false &v# *
color maps or contour plots. The distribution plots are graphs of cross-sectional 5 I(gP
curves through the candela distribution. E?/Bf@a28=
The orientation of the candela plots is determined by the Normal Vector and the (8*& 42W
Up Vector, as specified in the Analysis|Candela Options dialog box. The @'yD(ZMAz
normal vector specifies the axis of the candela plot and the up vector specifies X(;,- 7Jw
“which way is up.”
