给个英文的.个人理解可能会有点出入.基本上是这个意思. -DbH6u3
k,yc>3P;U
A candela plot is a plot of luminous intensity, or flux per solid angle. In photometric 5 >0\e_V
units, a luminous intensity plot is in units of candelas (lumens per steradian). In dY4 8S{
radiometric units, an intensity plot is in units of watts per steradian. Candela plots *tIdp`xT/T
are commonly used in the design of illumination systems, especially those used in 8b8e^\l(
the far field. 0 m)-7@
Candela data can be collected from ray sets of Missed rays, rays Exiting a surface h0&>GY;i
or rays Incident on a surface. Missed rays are a collection of all rays that “leave” n$}R/*
the model and “go off to infinity.” Exiting rays are the collection of ray segments K*J4&5?/
following the intersection point of a ray at a surface. Due to ray splitting, several 00$ @0
ray segments may contribute to the candela data for each incident ray. Incident u-]vK
rays are the collection of ray segments which intersect the selected surface. No }D&"z8mP
surface selection is required for Missed rays but one is necessary for Exiting and H'j_<R N
Incident rays. Ncs4<" {$
The candela plots represent flux versus angle and can be smoothed using the @+QYWh'
Candela Options dialog box. The iso-candela plots can be presented as false O?+tY
y?
color maps or contour plots. The distribution plots are graphs of cross-sectional $cp16
curves through the candela distribution. L<{OBuR
The orientation of the candela plots is determined by the Normal Vector and the c %6 @ z
Up Vector, as specified in the Analysis|Candela Options dialog box. The `[g# Mxw
normal vector specifies the axis of the candela plot and the up vector specifies [MSDk"o&
“which way is up.”
