Modelling a Dagger (1): How to bend straight faces I am trying to model this dagger I found on the internet (source):


So I first concentrated in the top part (the blade itself), and later model the handle. I started out with a cube, and tweaked it until I got to this point:



Now you can see my problem: I have no idea about how to "round" the sides of the blade, so that they are not straight but with a certain curvature.

I tried adding a bezier curve that adjusted to the outline of the blade, and then added a Curve modifier, but it seemed to bend only one part of the blade.

Of course I could just Loop Cut and Slide, and scale it up a bit. However I'm looking for a more precise way to do it. I'm pretty new to Blender and any advice on how to model the blade is more than welcome.

Thanks.
One approach would be in Edit Mode add a loop cut in the middle CTRL+R and delete the vertices on one side so you are working with half of the blade.



Add a Mirror Modifier and check "Clipping".



Add some loop cuts from top to bottom CTRL+R and scroll the mouse wheel to increase the number of loop cuts then Right Mouse click to complete. I used 12 in this example.



Select "Proportional Editing" and a "Fall Off Type". I choose Spherical. Select vertices in the middle and press "G" and use the mouse wheel to determine how many neighboring vertices are affected (Illustrated by a circle in the viewport)as you drag. Right mouse click to complete.