grab vertex along an edge?

[raincole]

If I press 'G' and then 'X', I can grab selected vertex along X-axis.

But what if I want to grab it along the edge it's on? For example, I have an edge and three vertices: two endpoints and one midpoint. Then I wanna move the 'midpoint' to quarter-point. How should I do?

[CoDEmanX]

how about Vertex Slide?

[raincole]

how about Vertex Slide?

Thanks! It's a cool addon. For those who as lazy as me, here is a link.

Bonus tip:

I found another way to do this. What's interesting is that B) method can move vertices precisely, but Vertex Slide2 can't.

[CoDEmanX]

wasn't talking about the addon, but the built-in vertex slide live operator...

[raincole]

Thanks. Soon after previous reply I realized it's built-in as of Blender 2.63...

just press Shift+V