I added a new Update Mode named Animation Only Updates, which updates the nodes only when the frame changes but it does not update them when the dependency graph updates. This helps to avoid the freeze of the VTK To Blender Volume node.
Note the VTK To Blender Volume node still freezes with Update All Automatically selected as Update Mode. However, rendering animations with VTK To Blender Volume node is now possible by selecting Animation Only Updates as Update Mode.
I also made a few small changes to make volume object and volume data deletion more precise when updating during animation.
I added a new Update Mode named Animation Only Updates, which updates the nodes only when the frame changes but it does not update them when the dependency graph updates. This helps to avoid the freeze of the VTK To Blender Volume node. Note the VTK To Blender Volume node still freezes with Update All Automatically selected as Update Mode. However, rendering animations with VTK To Blender Volume node is now possible by selecting Animation Only Updates as Update Mode.
I also made a few small changes to make volume object and volume data deletion more precise when updating during animation.