Figure 3
General mesh structure in 2 dimensions. The heart is embedded in a preliminary "scaffolding" voxel mesh, which comprises all of the voxels within the blue rectangle. The preliminary mesh is in turn embedded and aligned with a voxel torso mesh, whose outer nodes are shown in green. Within the preliminary mesh, the voxels that have nodes both inside and outside of the heart are located, and the nodes in these voxels that are outside of the heart are defined as boundary nodes (Xb). A surface (the "boundary surface") is fitted to these nodes. A coupling mesh (in purple) between the outer heart surface and the boundary surface is then generated.