thanks, but i didn't find something to install... would you like to explain more detaily about the installation?

@Greyhead and Remus: JoinPP is a powerfull script for push/pull on terrain, but there was a problem here.
If you use this tool , pull a shape along z axis to make a wall or a road on terrain, the top faces of the wall were a copy of these ones on terrain, it was not "flat", for example, vehicle such as cars can not ride on, is there another way to fix this?

@solo
I'm a VUE 6 xstream user too, but as I know, in vue you can not instance objects with the same dimension. It variated the scales of the objects, so I can't use that system to brushed such as a crowed. Any solutions you can help me? Thanks.

Thanks matteo, I found that the problem is about the polygonal structure. But Zbrush suports only OBJ exported. So that if I want to import model into SU, I must use the 3rd app to convert it from OBJ to 3ds(!!!). Hope the OBJImporter ruby make an options for checking the polyonal structure before put this thing into Sketchup.

I try the script OBJImporters.rb to import a model from Zbrush.
And here it is...

is that because the model is not triangles mesh? Or anything else? Please help me to fix it...,thanks

OBJimporterror.skp

Thanks for Updates, Sir!
But I have an idea, hope your scripts have one more option.
The follow me tool twisted the face along the 3d path, so can you fix it by make the line always parabel to a selected face? or more simple, the line always parabel to OXY or OXZ or OYZ of WorldXYZ.
Thanks again and sorry about my terible English.