Fig. 4

Visualization of the internal structure of a running shoe using X-ray computed tomography: (a) 3D translucent rendering of the midsole, viewed from the insole side, highlighting the positions of the heel and toe along with the placement of the stiffening element within the shoe; (b) detailed 3D rendering of the stiffening element, showing its shape and design, obtained through interactive thresholding of the corresponding voxels.