i have a tube model for making a tunnel,i want to bend this alittle ,because the tunnel is not a straight line , i think a ffd tools will be great ,since zbrush have no ffd tools,the most similar thing is to use zsphere and choose mesh to bind,i idraw few zsphere inside the tunnel and move those zsphere to bend the tunnel,but the tunnel mesh got twisted…i never press rorate but the zsphere rotate itself …
Investigate the various Curve Tube brushes. (Curve Tube or Curve Tube snap if you want to conform to a surface)
Draw out your tunnel as desired, shape the curve as desired. The curve can be bent and positioned by draging out the ends in snake like fashion until you get what you want, all in real time without having to rig or transpose anything.
Then delete the ends of the resulting tube by hiding them and selecting Tool >Geometry>modify Topology> Delete Hidden.
Flip the normals of the tube so that the walls face inward by hiding everything but the tube, and selecting Tool> Display properties> Flip Normals. Hit the double button there as well to see both sides of the tube.
Hope that helps.
this is the way that i create tunnel…but sometime we have a mesh already bended and have some detail on it,but we need to make some change ,let say the bend direction was wrong,the ffd tools is very useful this time…