给个英文的.个人理解可能会有点出入.基本上是这个意思. g`I`q3EF)
PLD 6 Ug
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric S<HR6Xw
units, a luminous intensity plot is in units of candelas (lumens per steradian). In cVya~ *
radiometric units, an intensity plot is in units of watts per steradian. Candela plots G|MjKe4}
are commonly used in the design of illumination systems, especially those used in Z^5j.d{e$
the far field. hqr I %%
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface A[)od
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 29]-s Utqv
the model and “go off to infinity.” Exiting rays are the collection of ray segments Fb#.Gg9b>
following the intersection point of a ray at a surface. Due to ray splitting, several -;9pZ'r
ray segments may contribute to the candela data for each incident ray. Incident GG%X1c8K
rays are the collection of ray segments which intersect the selected surface. No U
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surface selection is required for Missed rays but one is necessary for Exiting and i i&{gC
Incident rays. B w?Kb@
The candela plots represent flux versus angle and can be smoothed using the l,AK
Candela Options dialog box. The iso-candela plots can be presented as false KzD5>Xf]4$
color maps or contour plots. The distribution plots are graphs of cross-sectional <{ !^
curves through the candela distribution. wgfy; #
The orientation of the candela plots is determined by the Normal Vector and the AKs=2N> 7
Up Vector, as specified in the Analysis|Candela Options dialog box. The lCT N
dW+=
normal vector specifies the axis of the candela plot and the up vector specifies ;]YQ WK
“which way is up.”
