news: pan### [at] removeitgeloeschtnet...
> You need a prism for that. Prisms work with splines,
An alternative easy way is height_field.
Just save your alpha channel as an image and use it to make a height_field
that you texture with your all opaque logo image.
Set the water_level to open the wanted parts.
http://www.povray.org/documentation/view/3.6.1/279/
Marc