[osg-users] Setting view matrix seems to lag behind on frame

[Sebastian Messerschmidt]

Hi Robert,

Thanks for filling in on the details.

Cheers
Sebastian
> Hi Sebastian,
>
> On 1 December 2015 at 16:12, Sebastian Messerschmidt 
> <sebastian.messerschmidt at gmx.de 
> <mailto:sebastian.messerschmidt at gmx.de>> wrote:
>
>     Sorry for answering my own question:
>
>     The reason- of course- is threading. When setting the threading
>     model to single-threaded the correct matrix is used in the frame.
>
>
> I just had a look at the code, you don't set the DataVariance of the 
> osg::Geometry to DYNAMIC so when the viewer runs multi-threaded the 
> vertex update code can update the geometry whilst the previous frame 
> is still being rendered.  So rather than the camera lagging the 
> geometry by a frame, it's the geometry actually jumping ahead of the 
> camera.
>
> It's a subtle little bug but quite a good class example of the 
> challenges of trying debug multi-threaded applications :-)
>
> Robert.
>
>
>
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