Creating an edgeless material for flame I'm looking to recreate something like this , but if possible, using just the nodes editor and a mesh. I'm primarily having trouble with finding the right combination of nodes to create that edgeless, or feathered look to the mesh. The rest should be simple enough to do, mixing it in with transparent and emission shaders. I think I have that part of the node setup ready to go, but I need to have the rest of the node setup to be sure. That's where I'm hoping someone here might come in.
Just an idea..

You could just draw with really soft brush in Photoshop/Gimp, something similar to a flame. Then use that as the mask factor. 

 


I just did this on a flat plane. If you use a solid object just make sure all the sides are close to each other or it might look a little weird.