"Jovian Ghost" <nomail@nomail> wrote in message 
news:web.4ad3ea18e8a97d86683b0b960@news.povray.org...
> I've got a surface that I'd like to add multiple textures and/or pigments 
> onto.
> Is there a way I can constrict where a pigment/texture appears?
>
> For example, I've got a cylinder, and I'd like a pattern to appear on one 
> cap,
> with another texture appearing within the first one. Is there a way to 
> control
> the boundaries of where the textures go?
>

Yes. There are quite a few approaches you could take to do this type of 
thing.

To get a clean pattern on the end without it bleeding through into the rest 
of the object, you can start with a cylinder that is a tiny amount longer 
than needed and slice the extra off with a CSG operation. You can then apply 
a texture to the cutting object which will end up on the cut surface without 
affecting any other surfaces.

You can then use either layered textures or a texture_map to control which 
bits of texture go where on the cutting object. You can layer textures by 
simply specifying a succession of textures for an object, where upper layers 
have some transparent patches, so that the lower layers are visible in those 
places. Texture maps allow you to define a pattern where you can transition 
smoothly or sharply between different textures. For example, you could use 
the onion pattern in a texture map to create concentric rings of different 
textures, specifying a marble texture in the middle, transitioning to a 
crackle texture around the outside.

Regards,
Chris B.

Post a reply to this message