[Bf-docboard] sine wave errata

[Stefano Selleri]

I do believe it makes a moving gaussian, as stated in the doc, or at least
something similar to a gaussian.

The doc says what you can do to obtain something slightly similar to a
sinusoidal wave

Stefano
----- Original Message ----- 
From: "Chris Burt" <desoto at blender.spaceisbig.com>
To: "Blender Documentation Project" <bf-docboard at projects.blender.org>
Sent: Wednesday, October 19, 2005 12:36 AM
Subject: Re: [Bf-docboard] sine wave errata


> The code for the wave modifier isn't anything like what you'd expect.
> The wave modifier doesn't actually make a sinusoidal wave I don't think.
> I'm pretty sure it actually makes a moving parabola.
>
> Regards,
> --Chris
>
> Randall Rickert wrote:
> > In the user documentation on this page:
> > http://download.blender.org/documentation/htmlI/ch21s03.html
> >
> > It says:
> >
> >> To obtain a Sinusoidal-like wave
> >>
> >> To obtain a nice Wave effect similar to sea waves and close to a
> >> sinusoidal wave it is necessary that the distance between following
> >> ripples and the ripple width are equal, that is the Width Num  Button
> >> value must be equal to 4 over the Narrow value.
> >
> > There is a nice diagram also. Both the diagram and the text are
> > incorrect. The formula Width=4/Narrow does not create something like  a
> > sine wave. This is easy to see if you try using the values Width=4  and
> > Narrow=1. The result does not look at all like a sine wave.
> >
> > As far as I can tell, the formula for a wave that looks sinusoidal
> > should be Width=Pi/(2*Narrow). Probably a better way to write it is
> > Narrow=Pi/(2*Width), because most people would probably start with a
> > wavelength in mind (the wavelength is Width*2).
> >
> > It's a bad interface anyway, because making a sine wave (probably the
> > most common wave the user will want to make) shouldn't require the  user
> > to calculate Pi/(2*whatever).
> >
> > -Randall
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> >
> >
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