thanx for quick response.
i will try pretrace_start and pretrace_end = 1

but i don't quite get it-
usually i render with pretrace_start = 0.08 and _end = 0.005 and i thought, when
pretracing is done and rendering begins, povray will fetch from pretraced
values.
i don't quite understand why v3.62 works like this i.e.
10 hours pretracing
2 hours rendering- then i stop
and next day continue_trace with
x hours of rendering until i stop (following days wiht x hours of rendering)or
image done

while v3.7 gives me
10 hours pretracing
2 hours rendering- until i stop
and next day its again
10 hours pretracing
x hours rendering
where the second (and third and fourth...) pretracing gives me exactly the same
"pixels" as the first pretrace... starting with value 0.08 again even if last
days pretrace 0.005 was finished...

maybe i'm too stupid to see, what's behind this...
thx for enlightment...

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