Add interactive picking feature
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