On 3-4-2016 10:18, Stephen wrote:
> On 4/3/2016 7:54 AM, Thomas de Groot wrote:
>>
>> I may be missing something here, but is animation not very easy? just
>> rotate the inner cylinder. Essentially, the whole structure consists of
>> two moving semitransparent, superposed, image_maps.
>>
>>
>
> Probably not. But it is mumble, mumble years since I have seen one and
> was not sure how the effect was created. I thought that the glass
> cylinders might have been moulded to give local lenses on the inside.

Hmm... that is an interesting approach I had not thought about. Variable 
thickness of the inner cylinder might certainly be an interesting effect.

>
> Will the illusion work with computer graphics using planer images?
> What sort of masking is needed for the images and what frame rate to
> use? These questions I will need to find an answer to.
> I think that this might distract me from Elite Dangerous, for a while. :-)
>

Good. It will keep you from grave mischief in the digital world. I may 
want to explore a bit about superposition of images and such, without 
the animation part. I think that ior and photons should be involved too 
in the end.

-- 
Thomas

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