Wiardgroup

Here is a more precise explanation, taken from the net.

The original article is:

Mitsuhashi orbiting formula (JAES 30:10)
Journal Audio Engineering Society

Wave signals generated from a 3d surface

Both x and y functions and their first-order
derivatives are continuous over the terrain

Both x and y functions are zero on the
boundaries of the terrain

Ex. Formula
Wave( x , y) = (x -  y)(x - 1)(x + 1)(y - 1)(y
+ 1)
Fairly experimental sound generation

Orbiting the terrain
Fixed orbits
Produce a predictable signal

Time-varying orbits
Produce a signal that varies over time

Meaning FM or Vector modulation.

Here is more

This implements a 2-dimensional table access: F(x,y). It uses the formulas 
; given in Boronovo and Haus for calculating the x and y values:
; 	x = 2fxt + Px + Ix(t)sin(2piFxt + Qx)
; 	y = 2fyt + Py + Iy(t)sin(2piFyt + Qy)
; where 
;	fx, fy, Fx, Fy are frequencies
;	Px, Py, Qx, Qy are initial phase values
;	Ix(t), Iy(t) are "time-dependent orbital parameters," which means
;		the amplitudes of the sine waves which produce eliptical
;               motion through the 3D table.



--- In wiardgroup@yahoogroups.com, "coyoteous" <antithesist@m...> wrote:
> Okay, nevermind - I still don't understand the difference, but I see the 
> difference. Next time I'll read the assignment before I raise my hand - can 
> anybody point to this new research?
> 
> Thanks, Barry
> 
> --- In wiardgroup@yahoogroups.com, "coyoteous" <antithesist@m...> wrote:
> > Please add my "this is cool" vote, though something similar has been 
> around 
> > the CSound world for years:
> > 
> > Wave terrain synthesis with Csound
> > 
> > by Josep M. Comajuncosas - Barcelona, dec. 1997 / jan. 1998
> > 
> > http://www.csounds.com/jmc/Articles/Wts/WTS.html
> > 
> > Who is "the researcher who authored the paper" you reference?
> > 
> > Barry
> > 
> > --- In wiardgroup@yahoogroups.com, "grantrichter2001" <grichter@a...> 
> > wrote:
> > ...
> > > Bear in mind the technology is so new that not even the 
> > > researcher who authored the paper knows wht the technique 
> > > can do. The only way to find out is to experiment. 
> > ...