[vtkusers] texture mapping animation

[Darren Weber]

On Sat, May 3, 2008 at 9:16 PM, T.R.Shashwath <trshash84 at gmail.com> wrote:

> On Saturday 03 May 2008 20:58:51 Darren Weber wrote:
> > I have a closed surface where the faces contain triangles of the points,
> > eg:
> >
> > vtkSurf = vtk.vtkPolyData()
> > vtkSurf.SetPoints(points)
> > vtkSurf.SetPolys(faces)
> >
> > I also have a time-series of scalar values for every point.  How do I
> > display one time-point with a reasonable colormap?  How do I create a
> loop
> > that changes the point values that map into the colormap?
> >
> > Thanks in advance, Darren
>
> Hi,
>
> You'll have to create a vtkPointData instance to add to your surface. You
> can
> assign the scalar values of each point to that point data, and turn on
> scalar
> color mode in the poly data mapper. That will display one time-point. If
> you
> want to do an animation of the time-series, just replace all the point
> values
> again.
>
> -- Shash
>


>From the longer snip of my code below, you can see that I used
vtk.vtkPoints() to create the point data, which was then added to the
vtk.vtkPolyData() object.  Should I replace the use of vtk.vtkPoints() with
vtk.vtkPointData()?  Perhaps these objects are complementary, so I should
use both?

### BEGIN SNIP
           # put data into vtk data structure
            points = vtk.vtkPoints()
            points.SetNumberOfPoints(nVert)
            for i in range(nVert):
                v = self.vert['xyz'][i]
                points.SetPoint(i, v[0], v[1], v[2])

            faces = vtk.vtkCellArray()
            faces.Allocate(nFace, 1)
            for i in range(nFace):
                fv = self.face['vertex'][i]
                faces.InsertNextCell(3)
                # double check the order of vertices for vtk outward normals
                faces.InsertCellPoint(fv[0])
                faces.InsertCellPoint(fv[1])
                faces.InsertCellPoint(fv[2])

            vtkSurf = vtk.vtkPolyData()
            vtkSurf.SetPoints(points)
            vtkSurf.SetPolys(faces)
### END SNIP


Thanks in advance, Darren (Noob)
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