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feat(Rendering): add coordinate systems to Prop3D

Ken Martin requested to merge ken-martin/vtk:add_prop3d_coordinate_systems into master

Add the notion of what coordinate system a Prop3D is in such as

  • WORLD (the default)
  • PHYSICAL (within VR the physical room in meters)
  • DEVICE (relative to an device such as a Head Mounted Display)

When PHYSCIAL or DEVICE is specified you must provide the renderer that the coordinate system is related to through SetCoordinateSystemRenderer().

When the coordinate system is set to DEVICE you should SetCoordinateSystemDevice to indicate what device's space the Prop3D is in reference to.

See the OpenVR TestDragon test for an example of how to use.

Note that GetBounds and ComputeMatrix have been modified for this so analytic picking and similar operations should work.

To support this some additional pose/transformation methods were added to vtkMatrix4x4.

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