给个英文的.个人理解可能会有点出入.基本上是这个意思. _ pO `
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric @E.k/G!~Nb
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~:km]?lz0
radiometric units, an intensity plot is in units of watts per steradian. Candela plots ,#W
are commonly used in the design of illumination systems, especially those used in JY!l!xH( 6
the far field. &uUo3qXQ5l
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 8P:
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or rays Incident on a surface. Missed rays are a collection of all rays that “leave” =uDgzdDyE
the model and “go off to infinity.” Exiting rays are the collection of ray segments & _5tqh
following the intersection point of a ray at a surface. Due to ray splitting, several (z$r : p
ray segments may contribute to the candela data for each incident ray. Incident 6WoAs)ZF
rays are the collection of ray segments which intersect the selected surface. No ny-7P;->8
surface selection is required for Missed rays but one is necessary for Exiting and n}xhW'3hU=
Incident rays. c"!lwm3b
The candela plots represent flux versus angle and can be smoothed using the t:LcNlN|
Candela Options dialog box. The iso-candela plots can be presented as false %r)avI
color maps or contour plots. The distribution plots are graphs of cross-sectional #y|V|nd
curves through the candela distribution. K\XyZ
The orientation of the candela plots is determined by the Normal Vector and the j]0^y}5f+s
Up Vector, as specified in the Analysis|Candela Options dialog box. The '&;yT[
normal vector specifies the axis of the candela plot and the up vector specifies >!6i3E^
“which way is up.”
