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Yes, you are linearly scaling the structure. Your density will not change as a
function of position if you make scalar operations like those. I want to make
a sphere that is "100% dense" at r=0, but gradually tapers off to zero or a
minimum density at r=some R. This is easy to do with media.
Where does 3dnoise come from? It's not in the superpatch docs or documented
anywhere that I know of...
Buckaroo Bill wrote:
> I am probably the wrong person to answer this, since I don't understand the
> question. But I just figured out something about noise3d that maybe you
> already know but if not.. maybe it will help, it might even be correct.
>
> noise3d<x,y,z> gives one iteration of noise acros each face.
> noise3d<x*3, y*3, z*3> gives three.
> noise3d<x*3, y*3, z*3> *0.5 gives half the depth,
> noise3d<x*3, y*3, z*3> *5.0 gives five times the depth
>
> At least that is what it seems like. See "Noise3d" in p.b.i.
>
> Greg M. Johnson <gre### [at] my-dejanews com> wrote in message
> news:37FA64D8.6F1532FE@my-dejanews.com...
> > I'm having fun making flythroughs of the 3dnoise function in the
> > superpatch for povray.
> >
> > I am trying to understand this mathematically. If I use:
> > 3dnoise(x,y,z)
> > I get something with a uniform distribution of porosity. As the
> > threshold approaches 1.0, the percent porosity approaches 0 (% density
> > approaches 1.0). However, if the threshold is 0.0, there is not 100%
> > porosity.
> >
> > I want to understand how to change the radial density of the noise
> > function. Suppose I want to make a sphere where the density approaches
> > 0 at r=R. How would I do this? Intuitively, I might try:
> > 3dnoise(x^0.5,y^0.5,z^0.5)
> > . So far, nothing is yielding precisely the results I'm looking for.
> >
> >
> >
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