A vehicle body structure with a floor panel having rigidity to withstand an impact energy at an offset collision of the vehicle is provided. The STO includes: a spin polarization layer, a field generation layer positioned adjacent the SPL, and one or more interlayers positioned between the SPL and the FGL, and a magnetization easy axis of the SPL is positioned in an in-plane direction such that the SPL has no perpendicular magnetic anisotropy. A set of source cells is selected from the set of cells of the distance field to enable the rendering of the region.