Chladni_Plate.pde

//based on this site http://paulbourke.net/geometry/chladni/
float gridS = 2;//10
float m = 5;
float n = 1;
float hmult = 10;//50

void setup(){
  size(500, 500, P3D);
  //fullScreen(P3D);
}

void draw(){
  //m = map(mouseX, 0, width, 0, 10);
  //n = map(mouseY, 0, height, 0, 10);
  m = sin(float(frameCount)/70)*5+5;
  n = sin(float(frameCount)/50)*5+5;
  lights();
  noStroke();
  background(255);
  translate(0, height, 0);
  rotateX(10);
  for(int x=0; x<width-gridS; x+=gridS){
    beginShape(TRIANGLE_STRIP);
    for(int y=0; y<height; y+=gridS){
      float px = map(x, 0, width, 0, 1);
      float py = map(y, 0, height, 0, 1);
      float px2 = map(x+gridS, 0, width, 0, 1);
      float h = cos(n*PI*px)*cos(m*PI*py) - cos(m*PI*px)*cos(n*PI*py);
      float h2 = cos(n*PI*px2)*cos(m*PI*py) - cos(m*PI*px2)*cos(n*PI*py);
      vertex(x, y, abs(h)*hmult);//use abs for visualization
      vertex(x+gridS, y, abs(h2)*hmult);
    }
    endShape();
  }
}