3D-plot of "x^2+y^2-z^2=1"

Here is my code:

[x,y,z] = meshgrid( linspace( -10, 10, 20 ) );
f = x.^2 + y.^2 - z.^2 ;
isosurface(x, y, z, f, 1);

Question: I need the x, y, z coordinates to feed to SolidWorks to do 3-D printing. How can I do this, please ?

[Image Analyst]

What kind of data file does SolidWorks like? A CSV file? A binary file? How about dlmwrite(), fprintf(), or fwrite()?

[Chung-Hao Li]

XYZ COORDINATE FILES ARE REQUIRED FOR SoidWorks.

Answer 1

[Walter Roberson]

 fv = isosurface(x, y, z, f, 1);

returns face and vertex data in the structure fv.

Answer 2

[Chen Guo]

Why images are not continuous

[Walter Roberson]

please explain your question?

[Chen Guo]

Why isn't it connected

[Walter Roberson]

which command are you using? When I try the user code with MATLAB Online, I get a connected plot.

[Chen Guo]

Yes, when I try the user code I also get a connected plot. But, when I change the first two values of linspace to - 20 20, I get an unconnected plot. I don't know why.

[Walter Roberson]

f(0,0,0) is 0, not 1 (the isosurface level), so you only get points drawn completing the cones if there are enough points near the origin that happen to have value 1. But when you switch to linspace(-20,20,20), the closest coordinates to the origin are at about -1.05, leaving a gap of about 2.1 between adjacent points. It just isn't enough to fill in the middle with values near 1.

[Chen Guo]

OK, I got it. Thank you very much.