[Insight-users] MeshSpatialObject Issues

[Ghassan Hamarneh]

On 11/28/05, Julien Jomier <jjomier at cs.unc.edu> wrote:
> Hi Chris,
>
> I guess you are trying to use SOViewer to display a 2D mesh (from the
> file you sent). This is currently not possible, therefore only 3D meshes
> are supported (see example at the end of the email). You can try to
> convert your 2D mesh into a 3D one by setting the Z=0 of your points.
>
> Regarding the SpatialObjectToImageFilter, this filter is looking if the
> point is on the mesh (not inside the mesh). That's why (25,25) is
> returning false and currently this function is not implemented for
> LineCells... You can submit a bug report (www.itk.org/Bug) and we'll try
> to implement it.
>
> Let us know if you still have any issues/concerns.
> Thanks,
>
> Julien
>
> ----
> ObjectType = Scene
> NDims = 3
> NObjects = 1
> ObjectType = Mesh
> NDims = 3
> ID = 0
> TransformMatrix = 1 0 0 0 1 0 0 0 1
> Offset = 0 0 0
> CenterOfRotation = 0 0 0
> ElementSpacing = 1 1 1
> PointType = MET_FLOAT
> PointDataType = MET_FLOAT
> CellDataType = MET_FLOAT
> NCellTypes = 2
> PointDim = ID x y ...
> NPoints = 4
> Points =
> 0 1 1 0
> 1 100 1 0
> 2 100 225 0
> 3 1 225 0
> CellType = VRT
> NCells = 4
> Cells =
> 4 0
> 5 1
> 6 2
> 7 3
> CellType = LNE
> NCells = 4
> Cells =
> 0 0 1
> 1 1 2
> 2 2 3
> 3 3 0
>
> Chris McIntosh wrote:
> > Hello,
> >
> >    I'm trying to use an itk meshSpatialObject as the geometrical
> > component to a deformable model. I can deform the mesh without problem, but I'm
> > unable to correctly view the mesh using a spatialObject viewer. Also, trying to
> > use the spatialObjectToImageFilter results in incorrect output. In fact,
> > checking to see if point 25,25 is inline yields the wrong answer as well.
> >
> > I've included the meta file below that gets output from the
> > spatialObjectWriter.
> >
> > Basically, I create a rectangle using 4 points, 4 vertices, and 4 lines. The
> > reason I'm using lines is that I don't want to view a surface, I want to
> > view a wire-frame mesh. Basically, I'm deforming a spring-mass model and these
> > lines correspond to springs connecting the masses.
> >
> > Any help on this issue would be greatly appreciated. Of course, if it will
> > help I can provide code chunks.
> >
> > Regards,
> >
> > Chris McIntosh
> > MSc. candidate
> > Simon Fraser University
> > http://mial.fas.sfu.ca
> >
> >
> > -----------------------------------------
> > ObjectType = Scene
> > NDims = 2
> > NObjects = 1
> > ObjectType = Mesh
> > NDims = 2
> > ID = 0
> > TransformMatrix = 1 0 0 1
> > Offset = 0 0
> > CenterOfRotation = 0 0
> > ElementSpacing = 1 1
> > PointType = MET_FLOAT
> > PointDataType = MET_FLOAT
> > CellDataType = MET_FLOAT
> > NCellTypes = 2
> > PointDim = ID x y ...
> > NPoints = 4
> > Points =
> > 0 1 1
> > 1 100 1
> > 2 100 225
> > 3 1 225
> > CellType = VRT
> > NCells = 4
> > Cells =
> > 4 0
> > 5 1
> > 6 2
> > 7 3
> > CellType = LNE
> > NCells = 4
> > Cells =
> > 0 0 1
> > 1 1 2
> > 2 2 3
> > 3 3 0
> >
> >
> > _______________________________________________
> > Insight-users mailing list
> > Insight-users at itk.org
> > http://www.itk.org/mailman/listinfo/insight-users
> >
> >
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users
>