Biventricular coarse mesh (left: basal-apex view and middle: longitudinal view) and its Catmull Clark subdivision (right) with an element extracted showing interpolation directions (ξ1, ξ2, ξ3). Green surface: LV endocardium, blue surface: RV endocardium, red surface: epicardium. The mitral valve is shown in cyan, the aortic valve in yellow, the tricuspid valve in magenta and the pulmonary valve in green.