[kreativasas]

The easiest way is to brute force it: For each triangle compute it's distance to the point and then take the minimum. If the mesh is not large and you don't need to run this every frame, then it should suffice. 

I have yet to see a function in Ab3d that would do this, but that doesn't mean it does not exist.

I tried, but the mesh is very large and i have to test too many points..... It needs to much time!

Really there is not a fast way to do it?