[Paraview] Volume Rendering with opacity mapping and specular highlights

[Mathew Guilfoyle]

Thanks for the suggestions.  After looking into it further the type of visualisation I am after is volume rendering of the data with an opacity transfer function based on the scalar data values.

I have set up my volume rendering to have full (i.e =1) opacity through the range of scalar values I’m interested in, reducing to near transparency either side of this.  I also want specular highlighting of the opaque tissues.

However, despite these settings Paraview does not seem to render any voxels as fully opaque and there is certainly no specular highlighting.  Is this a known limitation?

Many thanks
> On 21 Sep 2015, at 15:10, David E DeMarle <dave.demarle at kitware.com> wrote:
> 
> Two suggestions:
> * try contour filter instead of threshold if contour isn't available, apply cell to point first.
> * try the clip filter with the clip type set to scalar.
> hth
> 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
> 
> On Mon, Sep 21, 2015 at 9:40 AM, Mathew Guilfoyle <mrguilfoyle at gmail.com <mailto:mrguilfoyle at gmail.com>> wrote:
> I would be grateful for some advice on volume and surface rendering in Paraview.
> 
> I am trying to generate 3D skull models from CT data.  The reason for using Paraview is to take advantage of the detailed fly-through/movie capability.  I can generate an acceptable 3D model that I can interact with in OsiriX and 3D Slicer, both of which I believe use VTK.  However, in Paraview I am struggling to create a 3D model that looks any good.
> 
> When I apply a threshold filter and view as a ‘Surface’ the image is a lot more ‘blocky’ than in the other two applications.  The image is dominated by the artifactual lines due to the original data being acquired as axial slices; whereas in OsiriX and 3D Slicer this gets smoothed out and the ‘genuine’ surface skull features (sutures etc) stand out.
> 
> I realise this is probably question of apply the correct series of filters and that the other two apps do this ‘under the hood’.  However, i have tried to apply Decimation and Smooth to the extracted surface and am not making any headway.
> 
> Any pointers would be very welcome
> 
> M
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