Merci Matt! Great plugin~
By the way, I come up with an idea, I think maybe it's useful!

I use the shortcut“shift+Y” to recall the last tool. When I use this plugin, a situation like this will happen:
first I use the "Edge follow me" tool to build a face,
then I move it to another place, and use move and scale to modify the curves,
then I want to do "Edge follow me" again

so the idea comes:------this tool have a function: ignore the move, scale, rotate, line, arc, rectangle, circle...(because they are so useful and they have shortcuts), but recall edge follow me, blend, extrapolate colors...(you must find it in a submenu).
On my bad English... hope you get my meaning...

@thomthom said:

If you have Vertex Tools then after selecting vertices and exiting vertex editing mode the related edges and faces will be selected.

I only saw the introduce...But the tool can't select groups and components...
Maybe this tool is easy to imagine but hard to make.
Thank you for your reply~

When I use sketchup to build some complex model, I come up with an idea that if I have a selection tool like in autoCAD- polygon selection, maybe it will save some time. Yesterday I googled out Thomthom's plugin- vertex tools( ),it have the same selection method, but only for vertexes...
I imagine a small button, after one click, you can use polygon selection like in autoCAD, and exit the tool automatically. Maybe there will be two button, another is freehand selection??
I think this tool maybe is more popular when in top view, like in autoCAD.

@tig said:

This "one-liner" copy/pasted into the Ruby Console makes all faces in the current selection have the same material front and back... BUT don't use it as an excuse for sloppy modeling

Sketchup.active_model.selection.each{|e|next if e.class!=Sketchup;;Face;e.back_material=e.material if e.material;e.material=e.back_material if not e.material}

If a face has a front-material then it's duplicated on its back, if it doesn't have a front-material the back-material [if any] is duplicated on its front.

It doesn't work on 'nested faces' unless you edit the group/instance and then 'select all', and then run the snippet...

Thanks for your advice~ I'm lazy I was drawing a concept model, so I thought that sort of plugin can make something easy...

Is thare a plugin that can let me assign a material in one go to both sides?
One click,two sides of the face. I think this function is good, when to build models for exporting into 3dsmax~
I've found Builder Boy's plugin
http://forums.sketchucation.com/viewtopic.php?f=180&t=32839 Is there a plugin: one click two sides?