Best way to walk on a mesh?

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Swifty

I`m currently coding the players avatar to walk on an uneven mesh that I am using for terrain, but I`m having problems getting it to "stick" to the ground. It is floating a little above the ground ,and sometimes drops through when going uphill.
I am using linepick to detect the mesh below the avatar. Would using entitycollided be better for this?

What would be the best way to code walking on a mesh?