给个英文的.个人理解可能会有点出入.基本上是这个意思. D#d/?\2
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric RVr5^l;"
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 3WPZZN<K9
radiometric units, an intensity plot is in units of watts per steradian. Candela plots <{z-<D;
are commonly used in the design of illumination systems, especially those used in K>#QC
the far field. `_3 Gb
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface Ag;Ybk[
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” I@( 3~ A b
the model and “go off to infinity.” Exiting rays are the collection of ray segments 1#|qT7
following the intersection point of a ray at a surface. Due to ray splitting, several } ;d=
ray segments may contribute to the candela data for each incident ray. Incident >Xxi2V y
rays are the collection of ray segments which intersect the selected surface. No IJLuu@kRm,
surface selection is required for Missed rays but one is necessary for Exiting and -C TLQyj)
Incident rays. (:RYd6i
The candela plots represent flux versus angle and can be smoothed using the /LG } nY
Candela Options dialog box. The iso-candela plots can be presented as false V" KuwM
color maps or contour plots. The distribution plots are graphs of cross-sectional {-hu""x>
curves through the candela distribution. ;/!o0:m^I
The orientation of the candela plots is determined by the Normal Vector and the Dt'bbX'edw
Up Vector, as specified in the Analysis|Candela Options dialog box. The p R ! m
normal vector specifies the axis of the candela plot and the up vector specifies +*wo iSD
“which way is up.”
