[Visualpython-users] how to visualize 3D surface?

[<pri...@gm...>]

hi folks,

I am new to VPython so this question may sound a little bit naive;
I've got a question concerning the problem how to visiualize a 2D-manifold in Vypthon. In this special case, the parameters are Theta and Phi to just plot a part of the surface of a sphere, where the Radius is constant. An additional feature would be that the surface is something like transparent or it also could be a spherical grid. I hope my english is not too bad, so that some of you could understand what my problem currently is. I hope I'll receive any help soon.

Thank you very much.

greets from germany

-Philipp

> You might study the example program faces_heightfield.py that comes with
> VPython, as it creates a surface.
>
> The most general VPython object is "faces" which lets you display
> arbitrary triangles and specify lighting at vertices. This low-level
> object could be used to display a portion of a sphere. Or if you want to
> display a portion of a sphere as a grid, use the "curve" object.
>
> There exists a beta version of VPython which lets you specify that an
> object is transparent. See the "Recent developments" section of
> vpython.org. Unfortunately the Windows version has some serious bugs
> (see the documentation in the Recent developments section) and there is
> no Macintosh version. The Linux version mostly works correctly.
>
> Bruce Sherwood
>
> pri...@gm... wrote:
> > hi folks,
> >
> > I am new to VPython so this question may sound a little bit naive;
> > I've got a question concerning the problem how to visiualize a
> 2D-manifold in Vypthon. In this special case, the parameters are Theta and Phi to
> just plot a part of the surface of a sphere, where the Radius is constant. An
> additional feature would be that the surface is something like transparent
> or it also could be a spherical grid. I hope my english is not too bad, so
> that some of you could understand what my problem currently is. I hope
> I'll receive any help soon.
> >
> > Thank you very much.
> >
> > greets from germany
> >
> > -Philipp
> >   

thx for the fast post. just like you recommanded, i have studied this example, and also tried to plot my surface. but this heightfiled_faces.py example comes a little bit complicated and it also doesn't do that what I expected. i need to add that I am new to python and I just wonder that it doesn't seem to be easy to plot a 3D-surface (just like in mathematica for example). nevertheless, I would truly like to understand this example programm, and also what I made wrong in useage; here are the differences to the example prog:

############################
theta = arange(0,pi/2.0,2./20)
phi= arange(0,2.0*pi,2./20)
x = sin(theta)*cos(phi)
y = sin(theta)*sin(phi)

m = Mesh( x, sqrt(1.0 - (x**2.0 + y**2.0)), y)
############################

when I try to run faces_heightfield.py with these modifications, "frames are not aligned" occurs. maybe somebody could help me with this problem, I would truly appreciate it....Thank you very much.

-phil 


-- 
Psssst! Schon vom neuen GMX MultiMessenger gehört?
Der kanns mit allen: http://www.gmx.net/de/go/multimessenger