BOOL LLDrawable::isRecentlyVisible() const { //currently visible or visible in the previous frame. BOOL vis = isVisible() || (sCurVisible - mVisible < MIN_VIS_FRAME_RANGE) ; if(!vis) { LLSpatialGroup* group = getSpatialGroup(); if (group && group->isRecentlyVisible()) { mVisible = sCurVisible; vis = TRUE ; } } return vis ; }