Thomas de Groot <tho### [at] degrootorg> wrote:
> On 25-9-2014 13:06, Ralf Jonas wrote:
> > Hi,
> >
> > although I'm not very new to povray (I already used it when it was
> > DKB-Trace), I'm very impressed by this draft made by a friend of mine in
> > Blender.
> > It's a kind of bathroom wall with tiles. Each tile in the top row and
> > the second row from bottom was made with a height field.
> > My question points to the dirt on the wall. It seems, like the dirt
> > drops down from above and fades out on its way down.
> > Can you tell me, how to do this in povray?
> >
> > Thanks in advance
> > Ralf
> >
> The most simple setup would be with a layered texture. The underlying
> one being the tiles; overlying that a simple texture with a gradient
> pigment_map with a strong vertical turbulence would do the trick. The
> most 'difficult' part would be to scale and translate that texture
> correctly but knowing the dimensions of the wall would help. For instance:
>
> texture {tile}
> texture {
>    gradient y
>    pigment_map {
>      [0.2 a transparent pigment]
>      [0.6 a dirt pigment]
>    }
>    warp {turbulence <0, 0.6, 0>}
>    scale ....
>    translate ....
> }
>
> Thomas

The easier way is to just UV map it and export to Povray. Dirt isn't all that
difficult to make in GIMP.

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