Figure 1
From: Interacting with the biomolecular solvent accessible surface via a haptic feedback device
The main features used in the surface tracking algorithm. An illustration of how the algorithm allows for proxy based haptic rendering of a molecular surface represented in space filling form. The three main features of a space filling molecule are marked as follows: Case 1: The HIP has penetrated a single sphere so the SCP can be calculated as the closest point on the surface, Case 2: The HIP is located between two intersecting atoms therefore the SCP must now be calculated as the closest point on the circle of intersection, Case 3: The HIP is situated beneath the intersection of several atoms. The intersection forms single points which can be calculated and used as the current position of the SCP, when the HIP moves out of this area the algorithm will then choose the next feature to calculate the new position of the SCP.