给个英文的.个人理解可能会有点出入.基本上是这个意思. drIK(u\_
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric F"[3c6yF
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 8%-%AWF]
radiometric units, an intensity plot is in units of watts per steradian. Candela plots e3g_At\
are commonly used in the design of illumination systems, especially those used in O_AGMW/2+
the far field. [@|be.g
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface H-2_j
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” rVcBl4&1*g
the model and “go off to infinity.” Exiting rays are the collection of ray segments q]XHa ,"
following the intersection point of a ray at a surface. Due to ray splitting, several -njQc:4W,-
ray segments may contribute to the candela data for each incident ray. Incident ;s }3e#$L
rays are the collection of ray segments which intersect the selected surface. No $ rB6<
surface selection is required for Missed rays but one is necessary for Exiting and i. M2E$b|
Incident rays. LABNj{=D!
The candela plots represent flux versus angle and can be smoothed using the 'hF@><sqk
Candela Options dialog box. The iso-candela plots can be presented as false yd*3)6=
color maps or contour plots. The distribution plots are graphs of cross-sectional Sr"/-
curves through the candela distribution. M(2`2-/xh
The orientation of the candela plots is determined by the Normal Vector and the K:_($X]
Up Vector, as specified in the Analysis|Candela Options dialog box. The lhxdx
normal vector specifies the axis of the candela plot and the up vector specifies Uouq>N
“which way is up.”
