Re: Top 10 IDL Requests

["Richard Tyc" <richt(at)sbrc.umanitoba.ca>]

anne martel <anne.martel@nottingham.ac.uk> wrote in message
39745A3A.CECAC2FA@nottingham.ac.ukqqq">news:39745A3A.CECAC2FA@nottingham.ac.ukqqq...
> My main request is for the ability to make polygon objects transparent.
> Someone posted a request for information on how to do this a short while
> ago but I don't think anyone responded so I'm assuming that it's not
> possible at the moment (unless you uses volume rendering which is too
> slow).

If you texture map a RGB+alpha  IDLgrImage object into the polygon object,
you can gain transparency assuming you set the alpha channel low enough and
the appropriate blend function (I use [3,4]) to IDLgrImage.