i found the problem now its wasnt a radiosity artefact, it did had to do
with the corner cylinders. here it is: i didnt understand the problem
because there should be nothing there and it couldnt be a shadow because
the shadowless(no_shadow) box should stop the non-shadowless stuff inside,
but it doesnt!! so luckly the only shadow you could see came from the
cylinders and making them shadowless wouldnt affect the picture.
so problems solved and thanks for the help!!

btw: sinced i posted my image anyway, comments are welcome

roelof

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