This is how works now, written from the vtk thread's perspective (in BASIC)
10 waitOnFrameReady() REM now the manta threads should be "stopped" because thread 0 is,
... REM process changes in vtk state by issuing transactions to let manta threads know about it.
60 displayDone() REM release the manta threads, I expect callbacks to be received now
70 waitOnFrameReady() REM this frame doesn't show the changes yet
80 displayDone() REM let manta render the frame that has the changes
90 waitOnFrameReady() REM now the image I get has the changes in it
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