给个英文的.个人理解可能会有点出入.基本上是这个意思. + J}h
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 9!D
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In =A"z.KfV
radiometric units, an intensity plot is in units of watts per steradian. Candela plots BT5~MYBl
are commonly used in the design of illumination systems, especially those used in |B),N f|a
the far field. $')Uie<!8
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface 5Ak>/QF9
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” &23t/`
the model and “go off to infinity.” Exiting rays are the collection of ray segments O0mQHpi:
following the intersection point of a ray at a surface. Due to ray splitting, several OnE~0+
ray segments may contribute to the candela data for each incident ray. Incident y# lg)nB
rays are the collection of ray segments which intersect the selected surface. No ADA* w 1
surface selection is required for Missed rays but one is necessary for Exiting and g8Zf("
Incident rays. %B Rll
The candela plots represent flux versus angle and can be smoothed using the !/e8x;_
Candela Options dialog box. The iso-candela plots can be presented as false k~ $}&O
color maps or contour plots. The distribution plots are graphs of cross-sectional u$x'P <b
curves through the candela distribution. 1 |3vwgRhs
The orientation of the candela plots is determined by the Normal Vector and the TiI3<.a!
Up Vector, as specified in the Analysis|Candela Options dialog box. The 42DB0+_wz
normal vector specifies the axis of the candela plot and the up vector specifies r9^~I
“which way is up.”
