[vtkusers] Creating a surface with three or more points

[Totte Karlsson]

Hi,
I seem to got stuck on something seeming very basic. I need to create a
surface (that I can render) from an arbitrary number of 3D points, typically
less than 5-6 points. I'll use it to visualize 'planes' in molecular
geometries.

The first geometry I am trying out is just the faces of a cube, i.e from 8
points creating the 6 faces of the cube. But seem to get stuck..

I started to create each plane and was using delaunay2d (part of the problem
I believe)

Code looking like this
    vtkSmartPointer<vtkPolyData> polydata = 
vtkSmartPointer<vtkPolyData>::New();
    polydata->SetPoints(mPoints);

    // Triangulate the grid points
    vtkSmartPointer<vtkDelaunay2D> delaunay =
vtkSmartPointer<vtkDelaunay2D>::New();
    delaunay->SetInputData(polydata);
    delaunay->Update();

    // Create a mapper and actor
    vtkSmartPointer<vtkPolyDataMapper> triangulatedMapper = GetMapper();
    triangulatedMapper->SetInputConnection(delaunay->GetOutputPort());

    vtkSmartPointer<vtkActor> triangulatedActor =   GetActor();
    triangulatedActor->SetMapper(triangulatedMapper);

where mPoints contain 4 points defining one cube face.

However, the above only works for the planes that are perpendicular to the z
axes. 

How to construct the other 4 planes? The ones parallel to the z-axes? 

I guess I should not need to use triangulation at all here, but I seem not
be able to find a simple example on how to just create and render a plane
from 4 points.

-tk






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