[vtkusers] SetInputArrayToProces(...) ..??

[David Doria]

On Wed, Feb 17, 2010 at 3:32 AM, Rakesh Patil <rakeshthp at in.com> wrote:
> I was going through the documentation of vtkGlyph3D here
>
> http://www.vtk.org/doc/release/5.4/html/a00651.html
>
> I came across:
>
> "You can set what arrays to use for the scalars, vectors, normals, and color
> scalars by using the SetInputArrayToProcess methods in vtkAlgorithm. The
> first array is scalars, the next vectors, the next normals and finally color
> scalars."
>
> SetInputArrayToProces(...)
>
> Sorry to ask such stupid question, but can any one explain me with example
> how to use this method..?? In my case, I have two different arrays.. one
> scalar array and another color scalars.. So how do i do this..??
>
> Thanks in advance
>
> Rakesh Patil
>
>

vtkGlyph3D is derived from vktAlgorithm, so you can call
SetInputArrayToProcess directly on the glyph filter:

vtkGlyph3D* glyph = vtkGlyph3D::New();
glyph->SetInputArrayToProcess(...)

The trick, then, is knowing what to pass it :) It is extremely
confusing - here are a couple of use cases I've seen, maybe you can
use this as a starting point:

glyph->SetInputArrayToProcess(0, 0, 0,
vtkDataObject::FIELD_ASSOCIATION_CELLS,
vtkDataSetAttributes::SCALARS);

glyph->SetInputArrayToProcess(0, 0, 0,
vtkDataObject::FIELD_ASSOCIATION_CELLS, "index");

glyph->SetInputArrayToProcess(0, 0, 0,
                                   vtkDataObject::FIELD_ASSOCIATION_CELLS,
                                   vtkDataSetAttributes::SCALARS);

I think you'd want to change the first 0 to a 1, 2 or 3 depending on
if you want to set scalars, vectors, normals or color scalars.

Play around with those and let us know if you get anywhere.

Thanks,

David