add a pybullet example to compare the result of soft body and deformable body

examples/pybullet/examples/test_inertia.py

@@ -0,0 +1,28 @@
+import pybullet as p
+from time import sleep
+
+physicsClient = p.connect(p.GUI)
+
+useDeformable = True
+if useDeformable:
+	p.resetSimulation(p.RESET_USE_DEFORMABLE_WORLD)
+
+gravZ=-10
+p.setGravity(0, 0, gravZ)
+
+planeOrn = [0,0,0,1]#p.getQuaternionFromEuler([0.3,0,0])
+planeId = p.loadURDF("plane.urdf", [0,0,-2],planeOrn)
+
+boxId = p.loadURDF("cube.urdf", [0,1,2],useMaximalCoordinates = True)
+
+clothId = p.loadSoftBody("bunny.obj", basePosition = [0,0,2], scale = 0.5, mass = 1., useNeoHookean = 0, useBendingSprings=1, useMassSpring=1, springElasticStiffness=100, springDampingStiffness=.001, useSelfCollision = 0, frictionCoeff = .5, useFaceContact=1)
+
+p.setTimeStep(0.0005)
+
+p.setRealTimeSimulation(1)
+
+
+while p.isConnected():
+  p.setGravity(0,0,gravZ)
+  sleep(1./240.)
+