I'm new to ice, and I was experimenting with strands. Could it be done, that strands don't go through each other. Here is a rendering, so you probably could better understand my problem:

Is this possible? Like I said I'm new to this, and I couldn't figure out how to fix this. I would be glad for any hint, link, tutorial or so.
thank you
mars
edit: here is my ice-tree so far
