Hello Daniel,
Daniel Wickeroth wrote:
> first of all thanks for the help on framerate limitations. We solved
> the problem using Qt Timers.
> But there is (as always) another problem. We have implemented a
> collaborative application, where the mouse cursor of one person is
> also shown to the other. So in the end both partners see two mouse
> cursors. The remote mouse cursor is rendered into an
> OSGImageForeground.
>
> Now here's the problem: we currently re-render the whole scene, just
> because the remote mouse was moved, which causes a change in the
> imageforegroud.
>
> Is there a way to re-render the foreground only, and leave the scene
> the way it was?
this requires that you keep the framebuffer content covered by the mouse
cursor around, so that you can restore it when the mouse moves to a new
position.
So the basic idea is to make a copy of the framebuffer (of part of it)
then draw the mouse cursor. Later when the cursor moves to a new
position, write the framebuffer content back and draw the cursor at its
new location.
One way to achieve this would be to render the scene into an FBO and
draw it as a texture on a e.g. PolygonBackground. As long as only the
mouse moves you render an empty scene with just that Background and your
cursor on the foreground, when the scene changes, you additionally
render the FBO texture again.
Hope it helps,
Carsten
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