给个英文的.个人理解可能会有点出入.基本上是这个意思. ddJe=PUb
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 8|l\E VV6
units, a luminous intensity plot is in units of candelas (lumens per steradian). In ~E2KZm
radiometric units, an intensity plot is in units of watts per steradian. Candela plots j}.\]$J
are commonly used in the design of illumination systems, especially those used in 3
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the far field. qKr8)}h
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface CTq&-l:f
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” h7lDHIQf
the model and “go off to infinity.” Exiting rays are the collection of ray segments hG12ZZ D
following the intersection point of a ray at a surface. Due to ray splitting, several 4R1<nZ"e ~
ray segments may contribute to the candela data for each incident ray. Incident ;;6uw\6
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rays are the collection of ray segments which intersect the selected surface. No -z)n?(pftm
surface selection is required for Missed rays but one is necessary for Exiting and Ch <[l8;K
Incident rays. w"-Lc4t+
The candela plots represent flux versus angle and can be smoothed using the 'h|DO/X~L
Candela Options dialog box. The iso-candela plots can be presented as false 1 28EPK
color maps or contour plots. The distribution plots are graphs of cross-sectional KBx6NU?;PO
curves through the candela distribution. ~j}cyHg
The orientation of the candela plots is determined by the Normal Vector and the g| I6'K!<
Up Vector, as specified in the Analysis|Candela Options dialog box. The :V RNs
normal vector specifies the axis of the candela plot and the up vector specifies JfLqtXF[&"
“which way is up.”
