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# stk::Mesh2D Class Reference

Two-dimensional rectilinear waveguide mesh class. More...

`#include <Mesh2D.h>`

Inheritance diagram for stk::Mesh2D:

List of all members.

## Public Member Functions
| Mesh2D (unsigned short nX, unsigned short nY)
| Class constructor, taking the x and y dimensions in samples.
| ~Mesh2D (void)
| Class destructor.
void | clear (void)
| Reset and clear all internal state.
void | setNX (unsigned short lenX)
| Set the x dimension size in samples.
void | setNY (unsigned short lenY)
| Set the y dimension size in samples.
void | setInputPosition (StkFloat xFactor, StkFloat yFactor)
| Set the x, y input position on a 0.0 - 1.0 scale.
void | setDecay (StkFloat decayFactor)
| Set the loss filters gains (0.0 - 1.0).
void | noteOn (StkFloat frequency, StkFloat amplitude)
| Impulse the mesh with the given amplitude (frequency ignored).
void | noteOff (StkFloat amplitude)
| Stop a note with the given amplitude (speed of decay) ... currently ignored.
StkFloat | energy (void)
| Calculate and return the signal energy stored in the mesh.
StkFloat | inputTick (StkFloat input)
| Input a sample to the mesh and compute one output sample.
void | controlChange (int number, StkFloat value)
| Perform the control change specified by number and value (0.0 - 128.0).
StkFloat | tick (unsigned int channel=0)
| Compute and return one output sample.
StkFrames & | tick (StkFrames &frames, unsigned int channel=0)
| Fill a channel of the StkFrames object with computed outputs.

## Detailed Description

Two-dimensional rectilinear waveguide mesh class.

This class implements a rectilinear, two-dimensional digital waveguide mesh structure. For details, see Van Duyne and Smith, "Physical Modeling with the 2-D Digital Waveguide Mesh", Proceedings of the 1993 International Computer Music Conference.

This is a digital waveguide model, making its use possibly subject to patents held by Stanford University, Yamaha, and others.

Control Change Numbers:

- X Dimension = 2
- Y Dimension = 4
- Mesh Decay = 11
- X-Y Input Position = 1

by Julius Smith, 2000 - 2002. Revised by Gary Scavone for STK, 2002.

## Member Function Documentation

StkFrames & stk::Mesh2D::tick | ( | StkFrames & | frames,
|  | unsigned int | channel = `0` |
| ) |  |  | `[inline, virtual]`

Fill a channel of the StkFrames object with computed outputs.

The `channel` argument must be less than the number of channels in the StkFrames argument (the first channel is specified by 0). However, range checking is only performed if _STK_DEBUG_ is defined during compilation, in which case an out-of-range value will trigger an StkError exception.

Implements stk::Instrmnt.

    00116 {
    00117   unsigned int nChannels = lastFrame_.channels();
    00118 #if defined(_STK_DEBUG_)
    00119   if ( channel > frames.channels() - nChannels ) {
    00120     oStream_ << "Mesh2D::tick(): channel and StkFrames arguments are incompatible!";
    00121     handleError( StkError::FUNCTION_ARGUMENT );
    00122   }
    00123 #endif
    00124
    00125   StkFloat *samples = &frames[channel];
    00126   unsigned int j, hop = frames.channels() - nChannels;
    00127   if ( nChannels == 1 ) {
    00128     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop )
    00129       *samples++ = tick();
    00130   }
    00131   else {
    00132     for ( unsigned int i=0; i<frames.frames(); i++, samples += hop ) {
    00133       *samples++ = tick();
    00134       for ( j=1; j<nChannels; j++ )
    00135         *samples++ = lastFrame_[j];
    00136     }
    00137   }
    00138
    00139   return frames;
    00140 }

The documentation for this class was generated from the following file:

- Mesh2D.h

The Synthesis ToolKit in C++ (STK)
©1995-2012 Perry R. Cook and Gary P. Scavone. All Rights Reserved.