the following

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#declare SphereInside=function(x,y,z,p,r) {
        select( vlength(<x,y,z>-p)-r),
                    0,1
                    )
    }
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gives me:
	
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        select( vlength(< <----ERROR

Parse Error: Expected 'operand', < found instead

Returned from renderer with error status
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how do have to correct this ?
I think, it is clear, what I want to do ... and: Yes, I need this as a function, NOT a
macro!
BTW: I also tried it with (sqrt((x-p.x)^2+(y-p.y)^2+(z-p.z)^2+))

How can I do ?

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