给个英文的.个人理解可能会有点出入.基本上是这个意思. m23+kj)+VY
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric ,Du@2w3Cq
units, a luminous intensity plot is in units of candelas (lumens per steradian). In /D]Kk m)
radiometric units, an intensity plot is in units of watts per steradian. Candela plots !)N|J$FU
are commonly used in the design of illumination systems, especially those used in {jjSJIV1
the far field. 0axxQ!Ivx
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface pe9@N9_5
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” + :V rip
the model and “go off to infinity.” Exiting rays are the collection of ray segments !BDUv(
following the intersection point of a ray at a surface. Due to ray splitting, several wu A^'T
ray segments may contribute to the candela data for each incident ray. Incident -
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rays are the collection of ray segments which intersect the selected surface. No @}WNKS&m
surface selection is required for Missed rays but one is necessary for Exiting and MU'@2c
Incident rays. :p' VbQZ{
The candela plots represent flux versus angle and can be smoothed using the n|Pr/ddL
Candela Options dialog box. The iso-candela plots can be presented as false D3`}4 A
color maps or contour plots. The distribution plots are graphs of cross-sectional Z% m-HE:k
curves through the candela distribution. -_NC%iN#C
The orientation of the candela plots is determined by the Normal Vector and the f;gZ|a
Up Vector, as specified in the Analysis|Candela Options dialog box. The EM@ ;3.IO
normal vector specifies the axis of the candela plot and the up vector specifies '0:i<`qv#g
“which way is up.”
