Hi Tal,
There is currently no support for axis scrolling in 3D, but we may introduce one in the near future as it is not different than the 2D case - actually the only problem is the scrollbar rendering. The scrollbar / data zooming internally use the paging view ZoomIn/ZoomOut functions:
NChart chart = nChartControl1.Charts[0];
NAxis yAxis = chart.Axis(StandardAxis.PrimaryY);
yAxis.PagingView.Enabled = true;
yAxis.PagingView.ZoomIn(new NRange1DD(10, 20), 1);
The code above clips the 3D output - can you post the code you used to restrict the range of the of the axis that results in no clipping?