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Hi,
trying to do is translate the result of a function on the isosurface in the x or
I can create a rippled surface for my isosurface using the following:
function {(y - cos(sqrt(x*x + z*z)*5*pi)*0.08}
I can get the same result if I construct the function using a pattern, using
something like:
#declare fn_ripples1 = function {
pattern {ripples scale 0.1 translate <0.5, 0, 0.5>}
}
The advantage of the pattern is I can translate the result of the function
different surface to that generated by the function outside of the pattern.
#declare fn_myripples = function { // This doesn't work as expected
pattern {
function {cos(sqrt(x*x + z*z)*5*pi)*0.08}
}
}
obvious.
Any suggestion are welcome.
Cheers,
Alan
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From: Thomas de Groot
Subject: Re: Trying to translate an isosurface function
Date: 11 Nov 2011 02:57:10
Message: <4ebcd556$1@news.povray.org>
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On 11-11-2011 2:31, Alan M wrote:
> obvious.
>
> Any suggestion are welcome.
>
I think paragraph *2.3.3.3.9 Transformations on functions* of the docs
will help you.
Thomas
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Thomas de Groot <tenDOTlnDOTretniATtoorgedDOTt> wrote:
> On 11-11-2011 2:31, Alan M wrote:
>
> > obvious.
> >
> > Any suggestion are welcome.
> >
>
> I think paragraph *2.3.3.3.9 Transformations on functions* of the docs
> will help you.
>
> Thomas
Thanks, it does help and explains the approach very well. Bit embarrassed to get
an RTFM as I was reading this part of the docs before I posted the question -
should've kept reading.
Alan
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From: Thomas de Groot
Subject: Re: Trying to translate an isosurface function
Date: 11 Nov 2011 07:26:48
Message: <4ebd1488$1@news.povray.org>
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On 11-11-2011 11:27, Alan M wrote:
> Thanks, it does help and explains the approach very well. Bit embarrassed to get
> an RTFM as I was reading this part of the docs before I posted the question -
> should've kept reading.
>
Sooner or later we all sin against the RTFM law ;-)
Thomas
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From: Slime
Subject: Re: Trying to translate an isosurface function
Date: 13 Nov 2011 04:38:02
Message: <4ebf8ffa@news.povray.org>
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> different surface to that generated by the function outside of the
pattern.
>
> #declare fn_myripples = function { // This doesn't work as expected
> pattern {
> function {cos(sqrt(x*x + z*z)*5*pi)*0.08}
> }
> }
I believe patterns evaluate the function and then wrap the resulting
value to the range [0,1). Since cos() returns negative numbers
sometimes, they're getting wrapped around to higher values (for
instance, -.3 becomes .7).
- Slime
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