[vtkusers] Re: CMake issues

[Bob Palank]

Greetings.
Running Win XP Home with VC++.Net Express 2005.  In attempting to build vtk
4.2 CMake 2.2-Patch3  reports that it cannot compile a sample program and
offers no output message.   I tested my own C program using cl from within a
batch file and the comile. link, execute sequence was successful.
What should I do?
BR
  Bob Palank
  -----Original Message-----
  From: vtkusers-bounces+bob=stlcc.org at vtk.org
[mailto:vtkusers-bounces+bob=stlcc.org at vtk.org]On Behalf Of Randall Hand
  Sent: Thursday, January 26, 2006 1:56 PM
  To: Goodwin Lawlor
  Cc: vtkusers at public.kitware.com
  Subject: Re: [vtkusers] Re: Metaball Simulation


  Clever.. so you mean I would derive a vtkMetaballs from
vtkImplicitFunction that basically had 1 user function "AddMetaball(float
position[3], float radius)".  Then all i'll need is to override the
EvaluateFunction and EvaluateGradient to return the correct value, right?

  wow.. That's nowhere near as complicated as I was expecting to have to do
:)  Thanks!


  On 1/26/06, Goodwin Lawlor < goodwin.lawlor at ucd.ie> wrote:
    Randall Hand wrote:
    > I'm curious if there is any way in VTK to do a create a MetaBall-type
    > dataset.  Example of metaballs can be found here:
    > http://www.corelmag.com/1103/overview/Metaball_Modeling.html
    > < http://www.corelmag.com/1103/overview/Metaball_Modeling.html>
    >
    > Basically I want to be able to define points in 3d-space along with a
    > Radius for each, and then have a vtkPolyData (or something like it)
    > created from the results of the Metaball surface.  Is there any way to
    > do this in VTK?  I can get a rough approximation by using a vtkGlyph3d
    > and mapping a vtkSphereSource at each point, but that leaves
    > intersecting geometry without the smooth features that come from a
    > Metaballs type algorithm.

    Hi Randall,

    This looks a job for a vtkImplicitFunction... maybe called vtkMetaballs.
    vtkMetaballs would define a centre, a radius, and a potential function
    for each metaball you add to the system. Then, just sample it with
    vtkSampleFunction, and create the surface with a vtkContourFilter.

    Have a look at this paper: http://tinyurl.com/7fdox

    hth

    Goodwin

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  --
  Randall Hand
  Visualization Scientist,
  ERDC-MSRC Vicksburg, MS
  Homepage: http://www.yeraze.com
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