Reducing the clip_far to 2000 should increase the accuracy, right?
Ok, I see: "camera.clip_near = 0;" 0 is an invalid value, because that would mean a divison by zero. Keep the value above 0 (or >= 1 as the manual suggests).
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual