Added python sample program

samples/street-navigation/main.py

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+from direct.showbase.ShowBase import ShowBase
+from panda3d import navigation
+from panda3d.core import PointLight,DirectionalLight
+
+class MyApp(ShowBase):
+
+    def __init__(self):
+        ShowBase.__init__(self)
+
+        # Setting up light for better view.
+        plight = PointLight('plight')
+        plight.setColor((20, 0.9, 0.9, 1))
+        plnp = render.attachNewNode(plight)
+        plnp.setPos(10, 20, 0)
+        render.setLight(plnp)
+        dlight = DirectionalLight('dlight')
+        dlight.setColor((0.8, 0.5, 0.5, 1))
+        dlnp = render.attachNewNode(dlight)
+        dlnp.setHpr(0, -60, 0)
+        render.setLight(dlnp)
+
+        # Loading the model
+        self.scene = self.loader.loadModel("models/street.obj")
+        self.scene.reparentTo(self.render)
+        self.scene.setP(90)
+        self.scene.flatten_light()
+        self.scene.setScale(0.25, 0.25, 0.25)
+        self.scene.setPos(-8, 42, 0)
+
+        # NavMeshBuilder is a class that is responsible for building the polygon meshes and navigation meshes.
+        self.builder = navigation.NavMeshBuilder()
+        # Take Nodepath as input. Nodepath should contain the required geometry.
+        self.builder.fromNodePath(self.scene)
+
+        self.builder.build()
+
+        # Code to attach the polymesh generated to the scene graph
+        self.node1 = self.builder.drawPolyMeshGeom()
+        self.node = self.scene.attachNewNode(self.node1)
+        self.node.setColor(0,0,1)
+        
+        
+
+
+app = MyApp()
+app.run()

samples/street-navigation/models/street.mtl

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+# Blender MTL File: 'None'
+# Material Count: 2
+
+newmtl Material
+Ns 323.999994
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+
+newmtl None
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2