Fractal Noise using fluid dynamics equations

fractalnoise.js

// Using Lorenz equations
// http://www.stsci.edu/~lbradley/seminar/attractors.html
// https://arxiv.org/ftp/math/papers/0305/0305212.pdf

x = 1.0;
y = -1.0;
z = 10.0;
P = 10.0;
R = 28.0;
B = 8.0/3;
scale = 0.014;
mix= function(x,y,z){ return x };
min = 0;
max = 0;
vol = 0.2;
val = 0;

scriptNode.onaudioprocess = function(e){
	var outputData = e.outputBuffer.getChannelData(0);
	
	for(var i=0;i<outputData.length;i++){
		if(playing){
			
			var dx = P*(y-x);
			var dy = R*x - y - x*z;
			var dz = x*y - B*z;
			
			x+=scale*dx;
			y+=scale*dy;
			z+=scale*dz;
			if( isNaN(x) || isNaN(y) || isNaN(z) ){
				console.log("step "+i+" isNaN "+x+" "+y+" "+z);
				playing  = false;
			}
			val = mix(x,y,z);

			if( val < min ) min = val;
			if( val > max ) max = val;
			val = 2*( (val-min) / (max-min ) ) -1;

			if(min!=max)
				outputData[i] = vol* val;
			
		} else {
			outputData[i] = 0;

		}
			
	}

    		
}