[vtkusers] Combined surface + wireframe view

[Malcolm Drummond]

Hi John

It's static, so applies to all your mappers - they in turn pass on
parameters to OpenGL etc. that determine how lines should be made to appear
on top of polygons.

HTH
Malcolm

----- Original Message -----
From: "John Platt" <jcplatt at lineone.net>
To: <vtkusers at vtk.org>
Sent: Tuesday, January 13, 2004 12:09 AM
Subject: FW: [vtkusers] Combined surface + wireframe view


> Hi Malcolm,
>
> I didn't use the 2 actor approach because different mappers are used for
> each actor and I wasn't sure which mapper should be used to resolve the
> coincident topology or even if it would work at all. Either mapper seems
> to work OK. Do you know if this is a happy coincidence?
>
> Many thanks.
>
> John
>
> -----Original Message-----
> From: Malcolm Drummond [mailto:malcolm at geovision.co.za]
> Sent: 12 January 2004 14:13
> To: John Platt
> Subject: Re: [vtkusers] Combined surface + wireframe view
>
> Hi John
>
> I think you could just use separate actors for edges and geometry, so
> you
> don't have to worry about setting up scalar values etc.
>
> Malcolm
>
> ----- Original Message -----
> From: "John Platt" <jcplatt at lineone.net>
> To: <vtkusers at vtk.org>
> Sent: Saturday, January 10, 2004 12:56 AM
> Subject: FW: [vtkusers] Combined surface + wireframe view
>
>
> Hi Malcolm,
>
> That did the trick - thanks.
>
> To achieve the combined view I am using vtkAppendPolyData with 2 inputs
>
>         vtkUnstructuredGrid->vtkGeometryFilter  -------------  1
>                                     |
>                                     |------ vtkFeatureEdges -- 2
>
> changing the cell scalar attribute data in vtkFeatureEdges before it is
> connected to vtkAppendPolyData to get the required edge colour. Is there
> an easier route?
>
> By setting the actor colour the same as the background, I was hoping to
> get the effect of a "hidden" wire frame. It would be very useful to have
> a vtkProperty::SetLineColor() to avoid messing with the scalar
> attributes to get the colours through a LUT (EdgeVisibility would be
> better still).
>
> Thanks again.
>
> John Platt
>
>
>
>
>
> -----Original Message-----
> From: vtkusers-admin at vtk.org [mailto:vtkusers-admin at vtk.org] On Behalf
> Of Malcolm Drummond
> Sent: 08 January 2004 22:20
> To: vtkusers
> Subject: Re: [vtkusers] Combined surface + wireframe view
>
> Hi John
>
> Have a look at the static vtkMapper method SetResolveCoincidentTopology
>
> HTH
> Malcolm
> ----- Original Message -----
> From: John Platt
> To: vtkusers at vtk.org
> Sent: Thursday, January 08, 2004 11:55 PM
> Subject: [vtkusers] Combined surface + wireframe view
>
> Hi vtkUsers,
>
> I would like to display both cell edges and coloured cell faces using
> the same vtkDataSetMapper (surface + wireframe combined).
> EdgeVisibilityOn() looked like the solution but it does not appear to
> have been implemented for vtkOpenGLPolyDataMapper.
>
> I tried using two superimposed actors with surface and wireframe
> representation set in the mappers but the cell edges were broken by the
> cell face colour. One solution may be to slightly inflate the wireframe.
>
> Has anybody managed to achieve this effect or tried to implement
> EdgeVisibilityOn()?
>
> Any suggestions would be greatly appreciated.
>
> John Platt
>
>
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