On 31-3-2015 14:08, Sven Littkowski wrote:
> Hi,
>
> I have a cylinder (open, hollow) that has a PNG graphic file as texture. That
> image consist only of white dots (blurred edges) and the rest is transparent,
> and I want to simulate light speed (or a wormhole travel, whatever).

Another idea: Have you thought about using an absorption media inside 
the cylinder? you might be able to simulate the light shift that way.
-- 
Thomas

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