Okay, back to your game. Now that there is a world, you need to fill it with objects.
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Every simulated object must have a body. All of these objects will share common code, so it would be nice if they could have a common parent class, but you also want to keep their existing properties. All physics objects will inherit from PNode and will have the best of both worlds! Just as RWNode represented a visual object for your earlier custom code describing object interactions in the game, the PNode superclass will represent the basic idea of a physical object, to be manipulated by the Bullet physics simulation engine.
Right after that, rename PNode. Open PNode. Here is some brief information about each of them:. Since creating convex objects in Bullet differs from creating concave objects, you need a flag. For example, you can describe the shape of an object as a sphere using btSphereShape or you can create complicated shapes with btBvhTriangleMeshShape , specifying vertices of triangles just like you do when rendering complex objects in OpenGL.
Of course, physics engines work faster with simple shapes, so you should try to use as many spheres and planes as possible. You can read more about collision shapes here. Next you need to write a method creating the body of the object. Place the following method in PNode.
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I strongly advise you to understand quaternions, since most 3D games use them for rotations. There is a good tutorial from Ray that covers rotations and quaternions here. You can read more about motion states here. Setting the property bodyCI. This is important moment. Sometimes you only have access to a physics body — for example, when Bullet calls your callback and passes you the body — but you want to get the node object that holds this body. Add it right after the instance variable declarations in PNode. Build and Run the project. Switch to PNode. All you have to do is to specify additional properties required for physics objects:.
Switch to ball.
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You should end up with this:. Those are totally okay to ignore for now or you can fix them the way I mentioned earlier in this tutorial. Switch to RWGameScene. Replace these lines:. Notice that final line. You simply need to add the body to the world. Next up is stepping the world. Remember, this is what gives the physics engine time to process the physics simulation and update the positions of each physics body accordingly. But wait! Why is the ball not moving, even though you can see in the Log that its position changes?
There is a physics world where you create bodies and all the simulation happens, but changes to simulated objects are not automatically applied to drawn objects and vice-versa. This means you have to write some code to synchronize the position of the physics object with the drawn ball.
As you probably know, all that fancy property stuff in Objective-C is just a convenient way of creating getter and setter methods. A transform is a translation [vector] plus a rotation [quaternion]. To fix this, you have to make almost the same changes to the paddle as you did to the ball. Switch to RWPaddle. A mass of zero means that forces or collisions with other objects do not affect the object.
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It can be static or, as in this case, kinematic since you move the paddle using touches. Finally, switch to paddle. Bouncing the ball on the paddle is fun, but your goal is a bit different. The changes you need to make here are once again familiar: I believe you can do them yourself. Switch to RWBorder.
Bullet Physics Library
Built from the Bullet physics library, the Maya Bullet plug-in lets you use the Bullet physics engine to create large-scale, highly-realistic dynamic and kinematic simulations. Bullet simulations can include interacting soft body and rigid body objects, as well as constrained collision objects, all contained in a single dynamic system within Maya.
Bullet automatically installs with Maya. After you load the Bullet plug-in, you can create simulations for your Maya scenes or export them to the native. To export scenes or objects to the Bullet format, select bullet from the File type list in the Export Selection Options and Export All Options windows.
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