[vtkusers] Need Help On Premitive Objects

[Vladimir Lazunin]

1. If you need to read into VTK some specific data format not supported by 
VTK readers - sure, you can do that. You should insert points coordinates 
into vtkPoints instance, then assign ids to cells in vtkCellArray, then 
assign these to a resulting object ( model->SetPoints(...), 
model->SetPolys(...) ).
Or, perhaps, more elegant approach is to use vtkProgrammableSource object. 
Loot at Examples\Modelling\.

2. Can't say anything about the rest of your question, but as for boundaries 
and edges representation - maybe you need vtkFeatureEdges filter.

4. Yes. vtkSpline and it's heirs.

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1.Now I guess I can build my own objects (my own element(s)) Is this right ? 
if yes then how ?
2. Let's say that I only want to use splines to draw my element boundaries 
and edges or I am willing to
    represent my elements by drawing their interpolation nodes. The question 
is, is it fine if I create so many
    instances (say thousands or hundred's of thousands) of the same object 
(say lines or dots) ?
    How should I do it to be     efficient ?
3. I need to draw many nodes as the very first step. Should I try spheres 
for it or there exist another more proper object?

4. Are there any splines available in VTK libraries?


Many Thanks
Davood Ansari