[vtkusers] Volume rendering - resolution

[Lisa Avila]

Hello Cedric,

The automatic adjustment of the image sampling is default behavior with ray 
cast volume rendering. I believe you adjust this in VTK 2.4 in the 
vtkRayCaster which you can get from the vtkRenderer (it's been a long time 
since VTK 2.4 and a lot has changed since then!)

If possible I would recommend moving up to VTK 4.2. I would also recommend 
trying the vtkVolumeTextureMapper2D with your data as it is likely to be 
faster (as long as you have a reasonable graphics card in your system) You 
can use vtkLODProp3D to tie together both mappers (ray casting and texture 
mapping).

Lisa


At 05:25 AM 6/13/2003, Cedric LE MAITRE wrote:
>Hi,
>
>I'm a VTK beginner and i'm looking at volume rendering for acoustic fish
>schools vizualisation.
>I'd retrieve a code based on VTK2.4 wich display a high resolution image
>after the volume rendering computation (cf. 3D-volum-high-resol.jpg).
>And when we want to interact with the scene (translation, rotation...)
>it goes on a low level rresolution display (cf. 3D-volum-low-resol.jpg).
>I don't know why ? is it automatic with VTK volume rendering ?
>
>I have to improve performance for this vizualition. vtkLODProp3D seems
>interesting for that, because it work with a Level Of Detail function of
>frame rate. This class seems inexistant in VTK2.4, could it be that
>implementation which work with my existant rendering ?
>
>Every information, news on vtkLODProp3D or vtkVolumeRendering are
>welcome.
>
>Regards,
>Cedric.