I like both ideas:
- transparent stars inside black image
- medium inside cylinder

But would a media not slow down the rendering? And it is only the stars that I
want to change the colors from white to red and blue, not the black. But how
would such a media be made? Can you give a sample code?

For working on the suggestion with transparent stars, I will change now the
graphic. Should easily be possible.

Steven




Thomas de Groot <tho### [at] degrootorg> wrote:
> 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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