给个英文的.个人理解可能会有点出入.基本上是这个意思. b<[Or^X
]
r.=K~A
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 6?gW-1mY
units, a luminous intensity plot is in units of candelas (lumens per steradian). In AEI>\Y
radiometric units, an intensity plot is in units of watts per steradian. Candela plots [T4J{y64Y
are commonly used in the design of illumination systems, especially those used in 'T;P;:!\
the far field. ,$ L4dF3
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface [o#oa k{U
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” v |,1[i{
the model and “go off to infinity.” Exiting rays are the collection of ray segments ah$b [\#C
following the intersection point of a ray at a surface. Due to ray splitting, several .&iawz
ray segments may contribute to the candela data for each incident ray. Incident i$"F{|Z0
rays are the collection of ray segments which intersect the selected surface. No (62"8iD6
surface selection is required for Missed rays but one is necessary for Exiting and |)DGkO td
Incident rays. R Z?jJm$
The candela plots represent flux versus angle and can be smoothed using the yNJ B
oar
Candela Options dialog box. The iso-candela plots can be presented as false .[KrlfI
color maps or contour plots. The distribution plots are graphs of cross-sectional se2!N:|R!G
curves through the candela distribution. tmYz R %i
The orientation of the candela plots is determined by the Normal Vector and the ; W
)Y
OT
Up Vector, as specified in the Analysis|Candela Options dialog box. The <]t%8GB2V
normal vector specifies the axis of the candela plot and the up vector specifies @Ns Qd_e
“which way is up.”
