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Source

//
// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
//
// This file is distributed under the same license as the Scilab package.
//

// =============================================================================
// tube : some tube like bodies.
// =============================================================================

function tube(nn)
	
	x=linspace(0,2*%pi,nn);
	//  atomic modell or so.
	y=0.1+[sin(linspace(0,%pi,15)),1.5*sin(linspace(0,%pi,10)),sin(linspace(0,%pi,15))];
	cosphi=dup(cos(x),length(y));
	sinphi=dup(sin(x),length(y));
	f=dup(y',length(x));
	x1=f.*cosphi;     y1=f.*sinphi;
	z=dup(linspace(-2,2,prod(size(y)))',prod(size(x)));
	
	my_handle                   = scf(100001);
	clf(my_handle,"reset");
	my_axe                      = my_handle.children;
	
	demo_viewCode("tube.sce");
	
	my_handle.immediate_drawing = "off";
	plot3d2(x1,y1,z,-1,35,70);
	my_plot                     = my_axe.children;
	my_handle.color_map         = jetcolormap(128);
	my_plot.color_flag          = 1;
	my_axe.rotation_angles      = [70,48];
	my_handle.immediate_drawing = "on";
	
endfunction

tube(50);
clear tube;

Result

Output from function tube