[Paraview] PV 3.6.2 and VirtualGL

[Paul Melis]

Utkarsh Ayachit wrote:
> That's very interesting. You are seeing the issue only with glyph not
> with any other filter? 
>   
- On a velocity field I had lying around, using the Stream Tracer
displays streamlines. Trying glyphs on the same set fails. Switching to
the slice representation works.
- Volume rendering works for the iron protein sample file, as well as
displaying output of a Contour filter. Saving the geometry and loading
it back in also displays it correctly.
- A simple Sphere source followed by e.g. Subdivide and Smooth works.
Showing the result in wireframe, points, etc. all works.
- From the PV sample data: policital.vtk shows the line map
- Glyphing doesn't work on multiple sets I tried, except for 2D vertex
glyphs. Glyph with Custom Source and e.g. a sphere source also doesn't work.

So, it seems it's basically glyping that fails...
> I am wondering if you can show two 3D
> geometries at the same time and does that work?
>   
Do you mean adding a Glyph filter twice, one set to e.g. Spheres, the
other to 2D vertex? If so, then this only shows the 2D vertices

Paul
> On Wed, Mar 3, 2010 at 7:27 AM, Paul Melis <paul.melis at sara.nl> wrote:
>   
>> Hi,
>>
>> I'm experimenting with running paraview on a remote visualization
>> server, using VirtualGL. This package basically lets you run an OpenGL
>> application as you normally would, but intercepts the swapbuffer events
>> to read back the framebuffer, which then gets JPEG compressed and sent
>> to a client machine (see [1] for an excerpt from the manual). On the
>> client side you get a normal X11 application (using X forwarding), but
>> the 3D rendering is done on the server side and transported using a
>> dedicated connection.
>>
>> When using PV 3.6.2 in this setup I get the following strange results. I
>> have a dataset on which I apply the Glyph filter. When running PV
>> locally (without any remote rendering) this glyphing works fine. But,
>> when I run paraview remotely it refuses to show glyphs for the exact
>> same dataset and same pipeline. The strange thing is that I can't get
>> any of the glyph types to show anything, except for 2D Glyph + Vertex.
>> For that mode I get what I expect.
>>
>> I've disabled depth peeling to exclude a source of possible
>> interference. VirtualGL itself should basically leave the 3D rendering
>> untouched, except during context creation and on swapbuffer events. Is
>> there anything special in how Paraview draws its glyphs?
>>
>> Thanks,
>> Paul
>>
>>
>> [1] "Whenever a window is created by the application, VirtualGL creates
>> a corresponding 3D pixel buffer (“Pbuffer”) on a 3D graphics card in the
>> application server. Whenever the application requests that an OpenGL
>> rendering context be created for the window, VirtualGL intercepts the
>> request and creates the context on the corresponding Pbuffer instead.
>> Whenever the application swaps or flushes the drawing buffer to indicate
>> that it has finished rendering a frame, VirtualGL reads back the Pbuffer
>> and sends the rendered 3D image to the client."
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