@mk1: theoretisch ja, aber ich kann nicht mall ffp nutzen. Das terrain in diesem speziellen fall muss aus mehreren "tiles" bestehen. Sogar shader wären keine wirkliche option

@julzmighty: sorry for switching the language.
thanks for your hint. its not really the chuncking but more the texture layout. the uvw map was covering 100% of the skin and therefor went also along the borders of it.
so ingame the pixel at the border where recalculated and this led to the seams.
in such a special case as mine they where visible.
but with shrinking the uvw map to less then 98% of the skinsize it now works.

cheers

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