Limited zoom when working with Pyvista

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This is side effect of the focal point being too close to the camera.

You may want to switch the camera to parallel projection or change the focus point.
Here is a quick example to experiment with both

import pyvista as pv


mesh = pv.Cube(x_length=100,y_length=100,z_length=100).triangulate().subdivide(6,'linear')

p = pv.Plotter()
p.add_mesh(mesh,name="mesh",show_edges=True)

def toggle():
  """ Toggle parallel_projection in camera """
  value = not p.camera.parallel_projection
  p.camera.parallel_projection = value
  p.reset_camera()


def pick_center(pos):
    print("New camera focal point", pos)
    p.camera.focal_point = pos
    p.update()

def enable_picking():
    """ Toggle parallel_projection in camera """
    p.enable_point_picking(callback=pick_center, show_message='Pick a point')

p.add_key_event('z', toggle)
p.add_key_event('c', enable_picking)


p.show()
```
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