On Sun, Sep 27, 2015 at 7:36 PM, Mathew Guilfoyle <mrguilfo...@gmail.com> wrote:
> Thanks for the reply - the ‘Shade’ setting was the key. Am I right in > inferring this property is not exposed for unstructured grids? > Right, it is only available for image data one. > If I threshold or clip the image data I can no longer turn ‘Shade’ on. > Because that creates a unstructured grid I believe. > > Does GPU acceleration work on OS X presently? > GPURayCast volume mapper which uses vtkImageData works on Mac if you use OpenGL2 backend. > Whenever I switch to GPU the image disappears; rendering on the CPU takes > a long time. Would this be more likely to work if I compiled the OpenGL2 > version? > Yes, please see my comment above. Thanks, > > Cheers > > On 25 Sep 2015, at 05:05, Aashish Chaudhary <aashish.chaudh...@kitware.com> > wrote: > > > > On Wed, Sep 23, 2015 at 3:34 PM, Mathew Guilfoyle <mrguilfo...@gmail.com> > wrote: > >> Aashish - thanks for the reply >> >> I am using the latest OS X binary download (4.4.0) - is this OpenGL2? >> When I switch ‘Volume Rendering Mode’ to GPU rendering all images disappear >> so I presume I’m only able to use CPU rendering. I am on a 2014 Macbook >> Pro with Nvidia GT750M. >> > > No it would be OpenGL old version VTK. It would be nice if you can try > OpenGL2 version although I don't think your problem is related to GL > version. > >> >> I’m using contrast enhanced volumetric CT imaging. I want to render >> blood vessels in red; within the scan they appear in approximately the >> 100-200 Hounsfield unit range. The full range of scalar data is [-1024, >> 3071]. On this basis I’ve set up the following colour and opacity mappings: >> >> Colour: >> Value R-G-B >> -1024 0-0-0 >> 99 0-0-0 >> 100 1-0-0 >> 200 1-0-0 >> 201 0-0-0 >> 3071 0-0-0 >> >> Opacity: >> Value Opacity >> -1024 0 >> 99 0 >> 100 1 >> 200 1 >> 201 0 >> 3071 0 >> >> None of the voxels appear to be fully opaque in the rendering. When I >> increase the specular from 0 to 1 it has no effect at all on the image. >> >> Have you enabled the lighting? > http://www.vtk.org/doc/nightly/html/classvtkVolumeProperty.html(ShadeOn) > on volume property? > > - Aashish > > >> Ideally, I would want to emulate something along the lines of this: >> http://www.cemuva.com/img/uploads/malformacion-arteriovenosa-cerebral-3d.jpg >> >> Again, cheers for the help >> Mathew >> >> On 23 Sep 2015, at 18:24, Aashish Chaudhary < >> aashish.chaudh...@kitware.com> wrote: >> >> Matthew, >> >> * Can you send us the exact number you are putting in for the transfer >> function? Make sure that you have values for the entire range of scalar >> values? >> >> * Are you using OpenGL2 version? >> >> - Aashish >> >> On Wed, Sep 23, 2015 at 1:18 PM, Mathew Guilfoyle <mrguilfo...@gmail.com> >> wrote: >> >>> 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.dema...@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 <mrguilfo...@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 >>>> _______________________________________________ >>>> Powered by www.kitware.com >>>> >>>> Visit other Kitware open-source projects at >>>> http://www.kitware.com/opensource/opensource.html >>>> >>>> Please keep messages on-topic and check the ParaView Wiki at: >>>> http://paraview.org/Wiki/ParaView >>>> >>>> Search the list archives at: http://markmail.org/search/?q=ParaView >>>> >>>> Follow this link to subscribe/unsubscribe: >>>> http://public.kitware.com/mailman/listinfo/paraview >>>> >>> >>> >>> >>> _______________________________________________ >>> Powered by www.kitware.com >>> >>> Visit other Kitware open-source projects at >>> http://www.kitware.com/opensource/opensource.html >>> >>> Please keep messages on-topic and check the ParaView Wiki at: >>> http://paraview.org/Wiki/ParaView >>> >>> Search the list archives at: http://markmail.org/search/?q=ParaView >>> >>> Follow this link to subscribe/unsubscribe: >>> http://public.kitware.com/mailman/listinfo/paraview >>> >>> >> >> >> -- >> >> >> >> *| Aashish Chaudhary | Technical Leader | Kitware Inc. >> * >> *| http://www.kitware.com/company/team/chaudhary.html >> <http://www.kitware.com/company/team/chaudhary.html>* >> >> >> > > > -- > > > > *| Aashish Chaudhary | Technical Leader | Kitware Inc. * > *| http://www.kitware.com/company/team/chaudhary.html > <http://www.kitware.com/company/team/chaudhary.html>* > > > -- *| Aashish Chaudhary | Technical Leader | Kitware Inc. * *| http://www.kitware.com/company/team/chaudhary.html <http://www.kitware.com/company/team/chaudhary.html>*
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView Search the list archives at: http://markmail.org/search/?q=ParaView Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/paraview