Hi Lionel,
I did some work to try and avoid this issue - it's essentially a new
frame starting and being tagged as a new frame, but new events come in
between the start of the new frame and when event queues are read for
the event traversal. I haven't tested in the ON_DEMAND rendering
though so I'll need to look into this. Unfortunately I have lots on
my plate right now so not in a good place to investigate right away.
A quick fix for yourself would be to change the message to INFO.
Robert.
On 12 April 2012 15:10, Lionel Lagarde wrote:
> Hi,
>
> When I use the FlightManipulator, I have a lot of warning messages:
> "Manipulator warning: eventTimeDelta = -0.004".
> The messages are displayed only using ON_DEMAND rendering.
>
> The GraphicsWindow has an event queue. The window related event (mouse move,
> ...) are appended in this queue.
>
> The osgViewer::View has also an event queue (not shared with the window). A
> FRAME event is pushed in this queue in the advance method.
>
> A frame is made of:
> advance
> {
> push FRAME event time = reference time = delta_s(view start tick,
> now)
> }
>
> eventTraversal
> {
> gw->checkEvents => fill the GraphicsWindow event queue time =
> delta_s(event queue start tick, now) > FRAME event time
> append gw events to a local event queue
> append view events to the local event queue
>
> here, the local event queue contains:
> gw event (time = T)
> gw event (time = T+1)
> gw event (time = T+2)
> ...
> FRAME event (time = T-1)
>
> the local event queue is not sorted (by event time) and the
> FlightManipulator doesn't like it.
> }
>
> The warnings are not printed in the CONTINUOUS rendering mode because the
> takeEvents method (used to takes the events from the graphics window event
> queue and the view event queue) uses a cutoff time (reference time). The
> window events are processed by the manipulator during the frame N+1.
>
> These messages are quite annoying. They exist in OSG 2.x but they are
> notified as info (most of the time not printed).
>
> I don't know how to correct this issue:
>
> sort the local event queue (using the event times) before the event dispatch
> always set cutoff time = reference time
> make the manipulators more flexible
> ...
>
> Any ideas ?
>
>
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