[vtkusers] Implicit boolean and dimensions of vtk

[pauldoesntlikesurfaceextractio]

Hi everyone, 

I am trying to create a Visualization for my smoothed particle hydrodynamics
simulation. This means, that I have a set of unorganized points and using
VTK I want to construct a surface body. 
My current approach is as follows: 

- Get Surface Particles from all unorganized points
- Triangulate the points which have further points nearby as a Delaunay3D 
- The points which have 5 or less points nearby I want to visualize as
Boolean implicit functions, very similar to this tutorial
https://lorensen.github.io/VTKExamples/site/Cxx/Filtering/ImplicitBoolean/

My problem: I can’t get the spheres to be smaller. Even when setting the
radius of the spheres I still get big spheres. *Can someone please tell me,
what I am missing? *

*A further question:* What dimension does VTK use? As in, when I set the
radius of a sphere to 1. Does that mean 1 meter, 1mm, 1 ft? 
Thank you very much




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