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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric #|,cy,v4
units, a luminous intensity plot is in units of candelas (lumens per steradian). In flC%<V%'-
radiometric units, an intensity plot is in units of watts per steradian. Candela plots li\=mH,Wr
are commonly used in the design of illumination systems, especially those used in N8Z z6{rp
the far field. GrJLQO0$N
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface [|c%<|d2
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” 6YNL4HE?
the model and “go off to infinity.” Exiting rays are the collection of ray segments a,S;JF)v
following the intersection point of a ray at a surface. Due to ray splitting, several M.s'~S7y
ray segments may contribute to the candela data for each incident ray. Incident q! 'p
rays are the collection of ray segments which intersect the selected surface. No ihwJBN>(
surface selection is required for Missed rays but one is necessary for Exiting and Q0K$ZWM`7
Incident rays. IKPGqoM
The candela plots represent flux versus angle and can be smoothed using the \B84
Candela Options dialog box. The iso-candela plots can be presented as false YK6'/2!
color maps or contour plots. The distribution plots are graphs of cross-sectional yj_> G
curves through the candela distribution. /u.ZvY3,
The orientation of the candela plots is determined by the Normal Vector and the jy2gR1~
Up Vector, as specified in the Analysis|Candela Options dialog box. The 0'Ho'wDb
normal vector specifies the axis of the candela plot and the up vector specifies 7`A]X,:
“which way is up.”