Fig. 7

Linear approximation of the femur bone surface triangulation in regular background mesh for two refinement steps in a slice through the femur head (a–c) and a zoom to the area of high curvature in the femur bone slice (d–f). For the coarsest mesh, we observe a clear difference between the piecewise linear approximation of the level set function and the surface triangulation in the area of high curvature. This difference is resolved by mesh refinement