[vtkusers] Multiple Surfaces at same height

[PsyVis]

Hello Gerrick
I've tried using the SetResolveCoincidentTopology functions but to no luck,
would you mind telling me if i'm doing right heres the code for the two
sepreate mappers

mesh 1 mapper:

        partMapper = new vtkPolyDataMapper();
        partMapper.SetInput(normals.GetOutput());
        // partMapperwl.SetScalarModeToUsePointData();
        partMapper.SetResolveCoincidentTopologyZShift(0.5);
        // partMapper.SetResolveCoincidentTopologyToPolygonOffset();
        partMapper.SetResolveCoincidentTopologyToShiftZBuffer();

        System.out.println("zbuff b" +
partMapper.GetResolveCoincidentTopologyZShift());

mesh 2 mapper:

        partMapperwl = new vtkPolyDataMapper();
        partMapperwl.SetInput(normals.GetOutput());
        partMapperwl.SetLookupTable(lut);
        //partMapperwl.SetResolveCoincidentTopologyToPolygonOffset();
        partMapperwl.SetResolveCoincidentTopologyZShift(0.1);
        partMapperwl.SetResolveCoincidentTopologyToShiftZBuffer();
        System.out.println("zbuff w" +
partMapperwl.GetResolveCoincidentTopologyZShift());

and here is a picture of the problem
http://www.nabble.com/file/p19766927/tiger%2Bprinting.jpeg 

Rich


Gerrick Bivins wrote:
> 
> 
> Hi Rich,
> Sounds like a z fighting problem but hard to tell without seeing.
> You could take a look at the "SetResolveCoincidentTopology" functions in
> vtkMapper to see if it can resolve your issue:
> http://www.vtk.org/doc/release/5.2/html/a00817.html#a2ea475413fed0b45566e33c
> c9f659e8
> 
> Gerrick
> 
> On 10/1/08 11:21 AM, "PsyVis" <osue80 at bangor.ac.uk> wrote:
> 
>> 
>> Hello 
>> 
>> I am trying to visualise some coastal hydrodynamical data taken from a
>> mathematical model where I've got two poly data surfaces (one
>> representing
>> the sea floor and the other representing the water level). At some points
>> the water level gets clamped to the same height as the sea floor so there
>> are two surfaces in the exact same space. When this is rendered it leaves
>> an
>> undesirable effect (almost like tiger printing - where the renderer
>> cannot
>> decide which triangles to draw on top of one another). I've tried using
>> seperate renderers(in the same renderwindow) and setting layers but this
>> doesn't work either.
>> 
>> Thanks very much
>> 
>> Rich
>> 
>> Here is the code for the rendering process
>> 
>> 
>>         vtkRenderWindow renWin = new vtkRenderWindow();
>>         renWin = renPanel.GetRenderWindow();
>>         renWin.SetNumberOfLayers(2);
>> 
>>         vtkRenderer wlRen = new vtkRenderer();
>>         wlRen = renPanel.GetRenderer();
>>         wlRen.AddActor(wlActor);
>>         wlRen.SetBackground(Colors.SLATE_GREY);
>>         wlRen.SetLayer(0);
>> 
>>         vtkCamera camera = wlRen.GetActiveCamera();
>>         camera.Zoom(1.5);
>> 
>>         wlRen.SetActiveCamera(camera);
>>        
>>         vtkRenderer ren = new vtkRenderer();
>>         ren = renPanel.GetRenderer();
>>         ren.AddActor(bActor);
>>         ren.AddActor(bbActor);
>>         ren.AddActor(edgeActor);
>>       
>>         
>>         ren.SetActiveCamera(camera);
>>         ren.SetLayer(1);
>>        
>>          renWin.AddRenderer(ren);
>>          renWin.AddRenderer(wlRen);
>>         
>> 
> 
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