PyBullet: add signed distance field support, with example/signedDistanceField.py

See also data\toys\concave_box.urdf and data\toys\concave_box.cdf

data\toys\concave_box.cdf was generated from concave_box.obj using
//GenerateSDF.exe -r "32 32 32" -d "-1.6 -1.6 -.6 1.6 1.6 .6" concave_box.obj
//SDF is based on code from DiscreGrid, https://github.com/InteractiveComputerGraphics/Discregrid

examples/pybullet/examples/signedDistanceField.py

@@ -0,0 +1,15 @@
+import pybullet as p
+import pybullet 
+import time
+p.connect(p.GUI)
+p.loadURDF("toys/concave_box.urdf")
+p.setGravity(0,0,-10)
+for i in range (10):
+	p.loadURDF("sphere_1cm.urdf",[i*0.02,0,0.5])
+p.loadURDF("duck_vhacd.urdf")
+timeStep = 1./240.
+p.setTimeStep(timeStep)
+while (1):
+	p.stepSimulation()
+	time.sleep(timeStep)
+