In article <3961f972@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> The shape of the falloff curve is irrelevant.
> 
> As long as 2 function remains the same *relative to each other*
> the intersection points remains the same. The code below proves it.

You are right, I was thinking of changing radius, not strength. If you 
render these three blobs you will see what I meant.
blob {
    sphere {< 0, 0.5, 0>, 0.75, strength 1}
    sphere {< 0,-0.5, 0>, 0.75, strength 1}
    threshold 0.25
    texture {
        pigment {color Red}
    }
    translate <-2, 1, 0>
}
blob {
    sphere {< 0, 0.5, 0>, 1, strength 1}
    sphere {< 0,-0.5, 0>, 1, strength 1}
    threshold 0.5
    texture {
        pigment {color Red}
    }
    translate < 0, 1, 0>
}
blob {
    sphere {< 0, 0.5, 0>, 1.5, strength 1}
    sphere {< 0,-0.5, 0>, 1.5, strength 1}
    threshold 0.75
    texture {
        pigment {color Red}
    }
    translate < 2, 1, 0>
}

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/

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