[vtkusers] How to change the color of a single polyline ??

[Rakesh Patil]

 Hello,As suggested by Bill, I tried to implement it by setting a scalar to celldata of my unstructured grid.. Initial setup of scalars works fine... But when i change color by selecting it, there doesnt seem any changes... Here is what I'm doing..I've used a callback technique to pick and object by deriving, a subclass from vtkCommand.In Execute function, I have following statement apart from highlighting..EApp::instance()>setSelectedPropId( picker>GetCellId());EApp::instance()>setSelectedActor( picker>GetActor());Later, when i change the type of polyline, this is what i do..vtkIdType id = EApp::instance()>getSelectedPropId();vtkActor *act = EApp::instance()>getSelectedActor();act>GetMapper()>GetInput()>GetCellData()>GetScalars()>InsertTuple1(id, 6);act>Modified();By doing this, it is not showin any change in color... Initially i'm setting all colors to 0. And my lookup table contains only 10 values... i mean colors.. Even if i add this actor to a renderer, no change is show
 n..What may be the problem..??ThanksRegardsRakesh Patil Original message From:"Rakesh Patil"< rakeshthp at in.com >Date: 24 Mar 10 10:14:09Subject:Re: [vtkusers] How to change the color of a single polyline ??To: "Bill Lorensen"Hello,Its not the question of highlighting... I'm working on FEM based mesh generation application.. So, I draw a line and have to set the property for this line. I mean polyline.. This line is classified into two, closed boundary or open boundary. So, initially when i draw a line, it has unassigned value.. i.e. boundary is not defined.. Thus it is black in color.. THen i select this line and change the properties.. If it is set to be an open boundary then it should be of say green color... and if it is of closed boundary, I need to show it in say brown color.. And this color will remain unchanged till end. I mean till mesh is generated, till file is saved. And even after file is reloaded, based on the property the same color it should show..I hope the p
 roblem is clear... :) Any solutions for this..??ThanksRegardsRakesh Patil Original message From:Bill Lorensen< bill.lorensen at gmail.com >;Date: 23 Mar 10 23:35:18Subject: Re: [vtkusers] How to change the color of a single polyline ??To: David Doria Add cell data scalars to the unstructured grid. Then you have two options:1) Assign a different cell scalar to the polyline to be highlightede.g. 1. Make all of the other cell scalars another value, e.g. 0.. Usea vtkLookupTable to assign the proper colors.2) Make each cell data scalar a unique value (say 0...n1). Create avtkLookupTable with n colors. Modify the entry of the cell you want tohighlight.BillOn Tue, Mar 23, 2010 at 8:02 AM, David Doriawrote:> On Tue, Mar 23, 2010 at 5:58 AM, Rakesh Patilwrote:>>>> Hello users>>>> I have one unstructured grid which contains more than one polylines and>> polyvertex. Now, on the other hand, I have only one actor corresponding to>> this grid. Now what I want to do is select a particular pol
 yline. And change>> the color of this polyline. Initially all polylines are black in color. Once>> i change the color, it should be reflected back in the actor only for that>> particular polyline..>>>> I have only one actor.. And i guess, using this actor, if i change the>> color, using get property, it changes the color of all the the polylines.>> How do i change the colors of only one polyline..??>>>> Thanks>>>> Regards>> Rakesh Patil>>>> I think you are supposed to make a new actor which contains the selected> line only, and set the color of that line.> Thanks,>> David> > Powered by www.kitware.com>> Visit other Kitware opensource projects at> http://www.kitware.com/opensource/opensource.html>> Please keep messages ontopic and check the VTK FAQ at:> http://www.vtk.org/Wiki/VTKFAQ>> Follow this link to subscribe/unsubscribe:> http://www.vtk.org/mailman/listinfo/vtkusers>> 
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