OpenGL Insights

42. Multimodal Interactive Simulations on the Web 615

In our scene, the lesser omentum is simulated as a deformable object which also

allows heat transfer. A mass-spring model is used for tissue deformation. Two dif-

ferent grids, coarse and fine, are generated (Figure 42.8). Each mass point (i,j) is

connected to its eight neighbors (i ± 2, j), (i ± 1, j), (i, j ± 1), and (i, j ± 2) with

springs and dampers.

The 2D boundary of the heat transfer object is extracted from the texture image

for node sampling. This helps in creating independent resolutions at initialization

regardless of the rendering-mesh resolution. In addition, since this works in tex- ...