给个英文的.个人理解可能会有点出入.基本上是这个意思. wj,=$RX
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A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 3u=g6W2 F
units, a luminous intensity plot is in units of candelas (lumens per steradian). In u_enqC3
radiometric units, an intensity plot is in units of watts per steradian. Candela plots w>gYx(8b
are commonly used in the design of illumination systems, especially those used in a9gLg
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the far field. ]DcFySyv
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface vzM ^$V
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” C _Dn{
the model and “go off to infinity.” Exiting rays are the collection of ray segments wT@og|M
following the intersection point of a ray at a surface. Due to ray splitting, several &8H'eAA
ray segments may contribute to the candela data for each incident ray. Incident uFE)17E
rays are the collection of ray segments which intersect the selected surface. No n S=W 1zf
surface selection is required for Missed rays but one is necessary for Exiting and \D4:Nt#
Incident rays. Hka2
The candela plots represent flux versus angle and can be smoothed using the _/|\aqF.
Candela Options dialog box. The iso-candela plots can be presented as false @]j1:PN-
color maps or contour plots. The distribution plots are graphs of cross-sectional +[VXs~I
q
curves through the candela distribution. ^W ^OfY
The orientation of the candela plots is determined by the Normal Vector and the ;pAK_>
Up Vector, as specified in the Analysis|Candela Options dialog box. The V 88p;K$+
normal vector specifies the axis of the candela plot and the up vector specifies eFgA 8kY)
“which way is up.”
