Hi Robert: I have two ways of performing the displacement:
-- time = nv->getFrameStamp()->getSimulationTime(); mT.makeTranslate( vehSpeed*time, 0., 0. ); -- mT.makeTranslate( dist, 0., 0. ); dist=dist+avgTime*vehSpeed; // avgTime is the average time per callback In the first case jumps appear regardless the vsync is on or off. In the second case jumps don't appear but, whenever the framerate changes (for instance by turning vsync off framerate turns from 60 to 160 fps), the avgTime needs to be recomputed in order to keep the desired velocity. I think I'm going to adopt the second strategy, but I am still wondering why the first one doesn't work. Thank you, Alfonso
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