[Bf-docboard] sine wave errata

[Stefano Selleri]

Okie!

Stefano
----- Original Message ----- 
From: "Randall Rickert" <randall at rickert-digital.com>
To: <bf-docboard at projects.blender.org>
Sent: Monday, October 17, 2005 12:27 PM
Subject: [Bf-docboard] sine wave errata


> 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
> _______________________________________________
> Bf-docboard mailing list
> Bf-docboard at projects.blender.org
> http://projects.blender.org/mailman/listinfo/bf-docboard