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> This is a misconception; a display whose voxels have non-isotropic radiation profiles are indeed able to depict position-dependent effects.

Sure, if you replace each pixel with a tiny light field display pixel you can do occlusion.

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Unfortunately, that's a big challenge for a volumetric display, particularly a spinning one. There's a mass problem (heavier spinny things are more difficult than lightweight spinny things). There's also a wire problem if the elements on the spinning element are active and need to be addressed, since the wires generally need to come through the hub. If a projector is used and the spinning element is passive, then there's a tricky alignment issue.

And in any case, there's a bandwidth issue, since every 3d point is now addressed by a 1D or 2D array. That's an enormous amount of the data that ultimately needs to be uncompressed by the time it hits the display hardware.

A hogel volume can be reduced into a 1bpp 2d plane representing the interference problem. Literally, a hologram. Probably the computational effort to do this in realtime is within reach of current GPUs.

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