"Wu Yang" <wya### [at] cswrightedu> wrote in news:3de43345@news.povray.org

> Hi, all
>    Does someone know the unit of the distance between the camera and
>    object? 
> Thanks

Your question is very hard to undersand.
There are no "units" in POV, all metrics (including ditance beetween camera 
to object) are in "Pov-units"

If you make scene 

sphere { // eath 
0 1.0
.. }

then 1 unit will be milons miles, and in scene 

sphere { 0 1.0 ... } // atom 

1 unit = 0.00000000000000000000000000001 " (or less)
 

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M

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