[vtkusers] UsingGetResolveCoincidentTopologyPolygonOffsetParameters etc

[Andrew Cunningham]

Hi John,
	I am bashing my head against the proverbial wall with this one...I  
have added the various necessary calls to the static members of  
vtkMapper:: and ... no change- although the geometry is drawn as  
expected, no offsets are applied.

Searching through the vtk code base shows only two relevant places  
where glPolygonOffset could be called - but isn't.

- vtkOpenGLPolyDataMapper::Draw ( this method is never called, I am  
not clear why). A vtkOpenGLPolyDataMapper is never even created.
- vtkOpenGLCoincidentTopologyResolutionPainter::RenderInternal

But....vtkOpenGLCoincidentTopologyResolutionPainter gets it's  
information about 'CoincidentTopology' settings from a vtkInformation  
* object and ignores the static globals in vtkMapper.

I simply wrap my vtkUnstructuredGrid in a vtkDataSetMapper.

PS this is VTK 5.4


Andrew


On May 9, 2009, at 4:22 PM, John Platt wrote:

> Hi,
>
> Yes, create 2 actors. I usually add the actors to a vtkAssembly and  
> add the assembly to the renderer. This ensures the actors stay  
> together.
>
> HTH
>
> John.
>
> ----- Original Message -----
> From: Andrew Cunningham
> To: John Platt
> Sent: Saturday, May 09, 2009 4:54 PM
> Subject: Re: [vtkusers]  
> UsingGetResolveCoincidentTopologyPolygonOffsetParameters etc
>
> Hi John,
> Thanks for the reply - I am still a bit confused about how to use  
> this. I am using an unstructuredmesh to represent the FE mesh. Do I  
> create two actors, one with wireframe properties, and one with  
> filled properties... and let this setting take care of the overlay?
>

Andrew

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