vertex move on the surface of the geometry
 

hi guys
i have a question,how can i move vertex just on the surface IN icem ? sometiomes,when i adjust the loacation of vertex to meet the geometry,i just think if i can just move vertex on the surface of geometry,i think it is very useful.

in icem ????

yes ,in icem i forgot it

in move verticies under the blocking tab, use fix x, y, or z. usually to move on the surface, you need to fix only one coordinate...
i use this feature in this video : http://www.youtube.com/watch?v=nuiRkZqaEz4
hope it can help

thanks ,i am chinese, whicn mean that i cannot see youtue. i know what you see ,but the surafce is three dimentional ( curved surface)