I have the top shape. If I subdivide it, I get the second shape. What I want is a way to get the third. I made it by subdividing the two long edges of the triangle, and then knifing between them, but I want a way to automate it.
Two possibilities (at least).
- W then subdivide, once the edges are selected: you have to be in edge select mode to do that.
- Knife tool (activated by K) then hold the Ctrl key to cut at the middle of the wanted parts (you have to click at each cut you want to position and to validate with Enter at the end)
This last way is certainly more easy. For instance :