3D graphing programs for ti 89 titanium

yugoo

Hi,

Just wanted to know if there are any good 3d graphing programs out there. I tried to look around but had no luck in finding any good ones. I usually have to do volume integrals etc...bu this calculator cannot draw any 3d shapes very well. e.g. z=sqrt(x^2 + y^2) gives me a very wierd shape instead of i think a cylinder. Any suggestion on what program is good for 3d graphing

Thanks