I would like to make a multi layered road texture. I've a jpeg image for the
background and i tried to put some tires ground tracks. In order to do
that, i used a gradient but there is an artefact (on the bottom of the
image) and i don't know how to deal with it.

#declare P_Road = pigment {image_map {jpeg ".texturesroad.jpg"} rotate
<270,0,0>};

#declare TextureRoad = texture{
                            gradient z
                            turbulence 0.05
                            lambda 1.5
                            omega 0.1
                            octaves 5
                            texture_map {
                              [0.0  P_Road]
                              [0.3  pigment{rgb <0.1,0.1,0.1>}]
                              [0.5  P_Road]
                              [0.7  pigment{rgb <0.1,0.1,0.1>}]
                              [1.0  P_Road]
                            }
                            frequency 0.25
              }

Thanks for your help.

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Download 'image000.bmp' (352 KB)

I finally figured out why, and after translating the texture i think it
works great. Now i'd like to put some dust on the road against the pavement
(like in the  image "autobahn" made by Jaime Vives Piqueres, on the side of
the road). And maybe some random tracks on the road. I don't know how to do
that. Should i use a pattern texture??!??

here is a glimpse of my work...

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Attachments:
Download 'image035.bmp' (595 KB)