"Simon" <povray@*NOSPAM*SOWare.co.uk> schreef in bericht 
news:4658ad5a@news.povray.org...
> Hi all,
>
> wonder if someone can point me in the right direction for how to fade an
> object into/out of visibility.
>
> I can do rgbt and modify the t but have some complex (for me) objects so 
> not
> sure how to do it for the whole union'd object rather than on a 
> per-pigment
> basis. Ideally I just want to change what % of light rays passing through
> the volume of the objects are affected by them
>
> Sorry if that was a tad unclear - Any help greatly appreciated
>

Hi Simon,
I think that  instead of union {}, you should use merge{}probably because 
otherwise, by making the (collection) of objects transparent, you will see 
the inner limits of the individual objects constituting the union. Merge is 
specific for transparent objects.
Now concerning your question, if each constituent object has its own 
pigment, I would make a  #declare T = yourvalue; and use that in every 
pigment inside the union/merge block. If the union/merge block has only one 
pigment, then it is much easier of course :-)
I hope this answers your question. Post an image in p.b.i. if in doubt.

Thomas

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