Added osgSim library which encapulsulates light points.

Added osglightpoint demo.

src/osgSim/BlinkSequence.cpp

@@ -0,0 +1,40 @@
+//C++ header - Open Scene Graph Simulation - Copyright (C) 1998-2002 Robert Osfield
+// Distributed under the terms of the GNU General Public License (GPL)
+// as published by the Free Software Foundation.
+//
+// All software using osgSim must be GPL'd or excempted via the 
+// purchase of the Open Scene Graph Professional License (OSGPL)
+// for further information contact robert@openscenegraph.com.
+
+#include <osgSim/BlinkSequence>
+
+#include <stdlib.h>
+
+using namespace osgSim;
+
+BlinkSequence::BlinkSequence():
+    Referenced(),
+    _pulsePeriod(0.0),           
+    _phaseShift(0.0),
+    _pulseData(),
+    _sequenceGroup(0) {}
+
+BlinkSequence::BlinkSequence(const BlinkSequence& bs):
+    Referenced(),
+    _pulsePeriod(bs._pulsePeriod),
+    _phaseShift(bs._phaseShift),
+    _pulseData(bs._pulseData),
+    _sequenceGroup(bs._sequenceGroup) {}
+
+
+BlinkSequence::SequenceGroup::SequenceGroup():
+    Referenced()
+{
+    // set a random base time between 0 and 1000.0
+    _baseTime = ((double)rand()/(double)RAND_MAX)*1000.0;
+}
+
+BlinkSequence::SequenceGroup::SequenceGroup(double baseTime):
+    Referenced(),
+    _baseTime(baseTime) {}
+