I have defined a simple texture, e.g.:
#declare paper1 = texture {
uv_mapping pigment { color rgb <0.8,0.8,1> }
normal { leopard 1 turbulence 1.7 scale 0.01 }
}
Now I want to draw a line on top of the texture (say I want black line of
thickness 0.1 from point (u,v) = (0,0) to point (u,v) = (1,1)).
What is the best approach to define such texture?
