Quick first prototype/test to integrate pybullet into Unity,

see readme.txt for details.

examples/pybullet/unity3d/readme.txt

@@ -0,0 +1,33 @@
+Quick prototype to connect Unity 3D to pybullet
+
+Generate C# Native Methods using the Microsoft PInvoke Signature Toolkit:
+
+sigimp.exe  /lang:cs e:\develop\bullet3\examples\SharedMemory\PhysicsClientC_API.h
+
+Add some #define B3_SHARED_API __declspec(dllexport) to the exported methods,
+replace [3], [4], [16] by [] to get sigimp.exe working.
+
+This generates autogen/NativeMethods.cs
+
+Then put pybullet.dll in the right location, so Unity finds it.
+
+NewBehaviourScript.cs is a 1 evening prototype that works within Unity 3D:
+Create a connection to pybullet, reset the world, load a urdf at startup.
+Step the simulation each Update.
+
+Now the real work can start, converting Unity objects to pybullet,
+pybullet robots to Unity, synchronizing the transforms each Update.
+
+void Start () {
+	IntPtr pybullet = b3ConnectSharedMemory(12347);
+	IntPtr cmd = b3InitResetSimulationCommand(pybullet);
+	IntPtr status = b3SubmitClientCommandAndWaitStatus(pybullet, cmd);
+	cmd = b3LoadUrdfCommandInit(pybullet, "plane.urdf");
+	status = b3SubmitClientCommandAndWaitStatus(pybullet, cmd);
+}
+
+void Update () 
+{
+	IntPtr cmd = b3InitStepSimulationCommand(pybullet);
+	IntPtr status = b3SubmitClientCommandAndWaitStatus(pybullet, cmd);
+}