I drove myself nuts trying to make stencyl do 3D, then went and played with unity for a bit.
Which isn't to say I had no success, but as soon as there's enough objects in the scene to make it look interesting, say goodbye to any pretence of running at a reasonable number of FPS. I wish you luck sir.
(I've done fully 3d rotateable wireframe, textured objects, lighting effects/fog all in stencyl, nothing playable came out of any of it)