Hardware clipping planes in VTK

[Lisa Sobierajski Avila]

Hello David,

Now that XGL and Starbase are gone, this seems like a good addition - at
least until we add some new graphics language that doesn't support hardware
clipping! :-)

Why did you chose to add these changes to vtkPolyDataMapper instead of
vtkDataSetMapper? It would seem that they could be added to
vtkDataSetMapper which would allow for clipping of more than just polydata.
And why did you add vtkImplicitFunctions instead of some other
specification that allows for only planes? The implicit function seems too
general - doesn't OpenGL require simple planes for hardware clipping?

Lisa Avila


At 02:53 PM 6/29/99 -0400, David Gobbi wrote:
>
>I have added hardware clipping planes to VTK, and would
>like to get some feedback before contributing the change
>to Kitware.
>
>All of the changes are limited to vtkPolyDataMapper, which has
>the following new methods:
>
>void vtkPolyDataMapper::SetClippingPlanes(vtkImplicitFunctionCollection)
>vtkImplicitFunctionCollection vtkPolyDataMapper::GetClippingPlanes()
>
>These allow you to specify up to 6 clipping planes which are
>handled by OpenGL.  This is equivalent to piping vtkPolyData
>through a set of vtkClipPolyData filters.  When you are moving
>the clipping planes around, doing the clipping in hardware 
>makes the rendering go several times faster.
>
> - David
>
>--David Gobbi, MSc                    dgobbi at irus.rri.on.ca
>  Advanced Imaging Research Group
>  Robarts Research Institute, University of Western Ontario
>
>
>
>-----------------------------------------------------------------------------
>This is the private VTK discussion list.  Please keep messages on-topic.
>Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
>To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
><majordomo at gsao.med.ge.com>.  For help, send message body containing
>"info vtkusers" to the same address.     Live long and prosper.
>-----------------------------------------------------------------------------
> 



-----------------------------------------------------------------------------
This is the private VTK discussion list.  Please keep messages on-topic.
Check the FAQ at: <http://www.automatrix.com/cgi-bin/vtkfaq>
To UNSUBSCRIBE, send message body containing "unsubscribe vtkusers" to
<majordomo at gsao.med.ge.com>.  For help, send message body containing
"info vtkusers" to the same address.     Live long and prosper.
-----------------------------------------------------------------------------