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Add interactive picking feature

Sreekanth Arikatla requested to merge sreekanth-arikatla/iMSTK:picking into master

Adds mesh to sphere picking collision

  • A mesh to sphere collision is used to determine the proximity of the device pointer to a node in the mesh.
  • The sphere radius is assumed to be small enough to detect one node at any given instant in time.

Adds picking collision handling

  • The contact handling specialized for picking dynamically sets the linear projection constraints to enforce the nodal displacements to follow the device

Adds test example for picking

  • Adds an example for picking

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