给个英文的.个人理解可能会有点出入.基本上是这个意思.
OV8b~k4= 31>k3IP& A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric bOck^1Hk y units, a luminous intensity plot is in units of candelas (lumens per steradian). In /"CKVQ radiometric units, an intensity plot is in units of watts per steradian. Candela plots sD{b0mZT are commonly used in the design of illumination systems, especially those used in
o@LjSQ5! the far field. @gi
Y Candela data can be collected from ray sets of Missed rays, rays Exiting a surface UWn}0:6t or rays Incident on a surface. Missed rays are a collection of all rays that “leave” D?\K~U* > the model and “go off to infinity.” Exiting rays are the collection of ray segments d;<n [)@ following the intersection point of a ray at a surface. Due to ray splitting, several 6eDIS|/ ray segments may contribute to the candela data for each incident ray. Incident fr#lH3 rays are the collection of ray segments which intersect the selected surface. No -;P<Q`{I surface selection is required for Missed rays but one is necessary for Exiting and g=Qga09 Incident rays.
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(IW The candela plots represent flux versus angle and can be smoothed using the M2@q{RiS Candela Options dialog box. The iso-candela plots can be presented as false &vMH
AZd color maps or contour plots. The distribution plots are graphs of cross-sectional 4(aesZ8h curves through the candela distribution. K%=n \Y The orientation of the candela plots is determined by the Normal Vector and the WQ5sC[& Up Vector, as specified in the Analysis|Candela Options dialog box. The Ab2g),;c normal vector specifies the axis of the candela plot and the up vector specifies TLSy+x_gX “which way is up.”