给个英文的.个人理解可能会有点出入.基本上是这个意思. xq =+M!V
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric L@S"c
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units, a luminous intensity plot is in units of candelas (lumens per steradian). In 2 *n2!7jZ*
radiometric units, an intensity plot is in units of watts per steradian. Candela plots E xKH %I
are commonly used in the design of illumination systems, especially those used in [Z,A quCU(
the far field. PqPLy
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface xC`Hm?kM
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” =nFT0] ;
the model and “go off to infinity.” Exiting rays are the collection of ray segments 66D< Up'K
following the intersection point of a ray at a surface. Due to ray splitting, several PTA;a 0A
ray segments may contribute to the candela data for each incident ray. Incident f1=BBQY
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rays are the collection of ray segments which intersect the selected surface. No 8_>\A=
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surface selection is required for Missed rays but one is necessary for Exiting and =b32E^z,
Incident rays. riZFcVsB
The candela plots represent flux versus angle and can be smoothed using the @iUzRsl
Candela Options dialog box. The iso-candela plots can be presented as false cZ|D!1%
color maps or contour plots. The distribution plots are graphs of cross-sectional >?'q P ]
curves through the candela distribution. `NXyzT`:K
The orientation of the candela plots is determined by the Normal Vector and the -6~*:zg,
Up Vector, as specified in the Analysis|Candela Options dialog box. The 0-0 )E&2
normal vector specifies the axis of the candela plot and the up vector specifies yr&oJYM
“which way is up.”
