> Hello yet again,
>
> I've been toying with my ascending spiral for a long time now, and I believe I'm
> achieving some good results, finally. Actually, thanks to you guys, of course.
>
> Anyway, Although I tried it a million different ways, I'm still getting
> artifacts, and I don't see a way to get rid of the problem.
>
> So, I started to wonder if there is a way to transform my ascending spiral into
> an isosurface. A parametric isosurface would be even better. And if there is a
> way to transform a blob straight into a mesh, that would be simply perfect. Here
> is a post to the images forum, so you can see the spiral:
>
http://news.povray.org/povray.binaries.images/thread/%3Cweb.4bc8bcc516734c1270e596300%40news.povray.org%3E/
>
> I got it by way of a cylinder blob with some 10,000 cylinders, and still those
> pesky artifacts remain. All I want is to make it completely smooth, and keep it
> "renderable" with my meager equipment.
>
> Thanks once again,
>
> Ruy
>
>
After looking at your image ant the other posts, here a sample:

isosurface{function{f_helix1(x,y,z,1,2,1,y,1,0,0)}
	contained_by{box{<42,-1,42><-42,40,-42>}}
	threshold 0
	max_gradient 1.7
	all_intersections
	pigment{gradient y
		color_map{[0 rgbf<1,0,0,0.8>][0.25 rgbf<1,1,0,0.8>][0.50 
rgbf<0,1,0,0.8>][0.75 rgbf<0,1,1,0.8>][1 rgbf<0,0,1,0.8>]}
		scale 41*y translate -1*y}
	finish{specular 0.7 roughness 0.001 reflection{0.001, 0.3 
fresnel}conserve_energy}
	interior{ior 1.4}
	scale<1,5,1>}


Alain

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