[vtkusers] volume rendering changes

[Lisa Sobierajski Avila]

Hello Miguel,

There are no new classes - these are changes in existing classes. You'll 
need to download a nightly release to obtain the changes.

Lisa


At 07:05 PM 9/2/2001, Miguel Angel Martin Fernandez wrote:
>Hi vtkusers!
>
>I am quite interested in these changes in vtkVolumeRayCastMapper,and I
>understood that they had already been released,  but
>however haven't been able to find the "new" volume rendering
>classes.
>
>         In case they are already available, any tips on how to get to them
>would be welcome, otherwise it would be very helpful for me to know when
>these changes are expected to be made "public".
>
>         Thank you!
>
>
>
>On Mon, 20 Aug 2001, Lisa S. Avila wrote:
>
> > Hello,
> >
> > I have just checked in some fairly significant changes to
> > vtkVolumeRayCastMapper. These changes are part of the "bigger picture" of
> > the rendering restructuring in VTK.
> >
> > Here are the highlights of the change:
> >     * The vtkVolumeRayCastMapper now does its own ray casting (as opposed
> > to relying on the vtkRayCaster)
> >     * The ray casting resolution is independent of the resolution at which
> > geometry is rendered - so when you drop to lower resolution ray casting 
> for
> > interactivity the geometry does not become blocky
> > Here are the API changes:
> >     * All the methods in vtkRayCaster are obsolete. This includes:
> >         * Methods to control the automatic image scale such as
> > AutomaticScaleAdjustmentOn, AutomaticScaleAdjustmentOff,
> > SetAutomaticScaleLowerLimit. Instead you should use these methods on the
> > vtkRayCastMapper: AutoAdjustSampleDistancesOn,
> > AutoAdjustSampleDistancesOff, SetImageSampleDistance,
> > SetMinimumImageSampleDistance, and SetMaximumImageSampleDistance
> >         * The method to control the number of threads - this has moved 
> from
> > vtkRayCaster to vtkVolumeRayCastMapper (SetNumberOfThreads)
> >         * Methods to control nearest neighbor or bilinear zoom - in the 
> new
> > vtkVolumeRayCastMapper only bilinear zoom is supported currently.
> >     * Ray bounding for ray casting is no longer supported. Therefore the
> > SetRayBounder method is obsolete on the vtkVolumeRayCastMapper.
> >     * A new variable IntermixIntersectingGeometry was introduced into the
> > vtkVolumeRayCastMapper. By default it is on. If you do not have
> > intersecting geometry (a bounding box around the volume is not
> > intersecting, a cursor drawn through the volume is) you may want to turn
> > this off to improve the performance and the low resolution image.
> >
> >
> > Here is what's coming next:
> >
> >          Next Monday I will be checking in the next set of changes. This
> > will include removing two passes from the renderer (ray casting and render
> > into image). At this point I will remove the following obsolete classes:
> >
> > vtkRayCaster
> > vtkViewRays
> > vtkRayBounder
> > vtkProjectedPolyDataRayBounder
> > vtkOpenGLProjectedPolyDataRayBounder
> > vtkMesaProjectedPolyDataRayBounder
> > vtkRayCastStructures.h
> > vtkVolumeRayCastStructures.h
> >
> >
> > Let me know if you run into any problems or have any questions.
> >
> >
> > Lisa
> >
> >
>
>--
>             ________________________________________________________
>   _________(_ 
> _)_________
>   \········(_   Miguel Ángel Martín 
> Fernández                      _)········/
>    \·······(_   ETSI Telecomunicación, Universidad de Valladolid   _)·······/
>     \······(_   Campus Miguel Delibes, Camino del Cementerio, s/n  _)······/
>      )·····(_   e-mail: miguel at atenea.tel.uva.es                   _)·····(
>     /······(_   Tfno: +34-983-423000 Ext. 25548                    _)······\
>    /·······(________________________________________________________)·······\
>   /__________) 
> (_____________\
>
>
>
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