Simple question (I think):

is it possible to create a 'surface' (so to use fill()) between two ellipses?

And if not: what would be a good way to create surfaces between two ellipses? By 'cutting' the ellipses in several line-elements and create rectangles between the corresponding elements of the two lines?

Script would be like this I think:
Code:

/*
- The coordinates of all ellipses are already known and in another array, lets say ellipses[]
- Each ellipse in ellipses[] will be cut into a number of elements, which is variable 'curveElements'
*/

pushStyle();
  fill(180);
  for (int e=1; e<ellipses.size(); e++){
    for (int t=1; t<(curveElements+1); t++){
    
	beginShape();
	  vertex(  xElement[e][t],	 yElement[e][t],	 zElement[e][t]	  );
	  vertex(  xElement[e][t-1],     yElement[e][t-1],     zElement[e][t-1]	);
	  vertex(  xElement[e-1][t-1],   yElement[e-1][t-1],   zElement[e-1][t-1]    );
	  vertex(  xElement[e-1][t],     yElement[e-1][t],     zElement[e-1][t-1]    );
	endShape(CLOSE);
	
    }
  }
popStyle();