Create a new scene: Create a new program called “factory.py”. Start by disabling the mouse and then place the camera at (1,-8,5) with a pitch of -25 degrees. Then define a class called World that derives from DirectObject (this allows World to receive events). In the constructor of the World class load and display two models: ./Models/factoryfloor.egg and ./Models/box.egg. Position the box at (1,0,2), scale it down to 30% and give it a heading of 45 degrees. Make sure you can see both the floor and the box.

Opening and closing the door: The floor contains a door object. Acquire a pathnode to it and call it door. Create two LerpPosIntervals for the door, one to open it by moving it to location (-1,0,0) and one to close it by moving it to location (1,0,0). You can play with the duration but 2.0 seconds is a good place to start. Make the World accept a 'space' (spacebar key) event and call the handler self.door_handler. In that handler, either start the opening interval for the door or the closing interval, depending on whether it's open or closed already (you'll need a new boolean member variable to keep track of that). Make sure you can now open and close the door with the spacebar.

Improving the door a little: When you create the opening and closing intervals, give the constructor attribute blendType a value of “easeInOut” for a bit more realistic trap door motion (you can play with the other values “easeIn” and “easeOut” as well). Also, give the attribute name the same name for both intervals - this ensures that the first interval gets cancelled when the second one gets starts.

Creating Collision Solids: Attach a new CollisionNode to the box pathnode and give it the name “box” (you pass the name into the constructor of the CollisionNode). To thie node of this new pathnode, add a new collision solid of the type sphere and give it a radius of 1.5.

# HINT - Creating and attaching a CollisionSphere
nodepath = object.attachNewNode(CollisionNode('object'))
nodepath.node().addSolid(CollisionSphere(0,0,0,radius))

Similarly, attach a new CollisionNode to the door pathnode and call it door*. This time however, add a CollisionPolygon to the node of the new pathnode. The verticies of this polygon are (-1,-1,0), (1,-1,0), (1,1,0) and (-1,1,0) in that order.<code python> # HINT - The CollisionPolygon nodepath.node().addSolid(CollisionPolygon(Point3(x,y,z),Point3(x,y,z),Point3(x,y,z),Point3(x,y,z))) </code> Call show() on your new nodepaths and you should see your collision solids as semi-transparent objects when you view your scene. Verify that your solids are in the right place. - and then attach a new CollisionNode** to that pathnode