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Factory Scene with PhysX (unfairly only for Windows)

Panda 1.7.0 comes with a Python exposure for PhysX, which is called Panda PhysX. Panda PhysX is a Python library you will use to access the Physx API from a Panda script.

To begin with, you need to import the Panda PhysX classes you will use along the code.

from panda3d.physx import PhysxManager
from panda3d.physx import PhysxEnums
from panda3d.physx import PhysxSceneDesc
from panda3d.physx import PhysxBodyDesc
from panda3d.physx import PhysxActorDesc
from panda3d.physx import PhysxBoxShapeDesc
from panda3d.physx import PhysxPlaneShapeDesc
from panda3d.physx import PhysxPointOnLineJointDesc

The PhysxManager is your entry point to the PhysX engine. It is a singleton, that is a class that can have only a single global instance.
```
self.physx = PhysxManager.getGlobalPtr()
```

The physics simulation take place into a PhysX scene, a sort of side invisible world where the objects have their physical incarnation. So, to begin with you want to create a PhysX Scene. Every time you want to create a general PhysX object, you need to provide a descriptor first and pass it as a parameter to a specific creation method. A descriptor is a blueprint of the object that you want to build and the creation method will return an instance of it. This fancy-looking way of instantiating classes is actually a variation of the Factory Method Design Pattern, it has many advantages and make a system easily extendible.
```
# Setup the physical world
sceneDesc = PhysxSceneDesc()
sceneDesc.setGravity(Vec3(0, 0, -9.81))
self.scene = self.physx.createScene(sceneDesc)
# Material of the world
m0 = self.scene.getMaterial(0)
m0.setRestitution(0.1)
m0.setStaticFriction(0.3)
m0.setDynamicFriction(0.3)
```