给个英文的.个人理解可能会有点出入.基本上是这个意思. ;^*Unyt[4]
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric FMkOo2{
units, a luminous intensity plot is in units of candelas (lumens per steradian). In 4}_O`Uxh
radiometric units, an intensity plot is in units of watts per steradian. Candela plots V .o s
are commonly used in the design of illumination systems, especially those used in j1_ @qns{
the far field. rl9. ]~
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface T\Uek- (
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” iA8U Yd3Q
the model and “go off to infinity.” Exiting rays are the collection of ray segments &]
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following the intersection point of a ray at a surface. Due to ray splitting, several iX0iRC6f
ray segments may contribute to the candela data for each incident ray. Incident [V 4 {c@
rays are the collection of ray segments which intersect the selected surface. No : ^ 8
surface selection is required for Missed rays but one is necessary for Exiting and MCU_Z[N#10
Incident rays. 66^yc ZCH
The candela plots represent flux versus angle and can be smoothed using the 763+uFx^
Candela Options dialog box. The iso-candela plots can be presented as false e]jH+IR:>
color maps or contour plots. The distribution plots are graphs of cross-sectional [((;+B
curves through the candela distribution. 8$(Dz]v|[&
The orientation of the candela plots is determined by the Normal Vector and the {] "]uT#
Up Vector, as specified in the Analysis|Candela Options dialog box. The ; 7N
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normal vector specifies the axis of the candela plot and the up vector specifies D")_;NLE1
“which way is up.”
