This videos demonstrates several methods to get sharper edges on a T-Spline body.
T-Splines bodies often have soft edges but there are many ways to sharpen those edges. When using create commands such as box or extrude, the number of faces can be increased. More faces produce sharper corners but also increase the complexity of the body.
Use edit form or slide edge to move edges closer together. Edges that are closer produce sharper corners.
Insert edge or insert point add edges to the body. More edges in a single area create sharper corners.
Crease edge produces a sharp edge between faces. Remove the crease using the uncrease command.