#jMonkeyEngine 2D using Dyn4J.
###Basic Shapes
##Rationale. jMonkeyengine has an excellent 3D physics engine bundled - Bullet. I've recently been trying to make a 2D game with physics using all the standard stuff in jME, with mixed luck. I came close by forcing Z=0f using physics tick listeners. But when stuff moved fast (projectiles or really hard/fast collisions) stuff started moving behind each other (Z axis) and I figured trying to switch to a pure 2D physics engine was the right way to go.
##Solution. Attempt to mimic the familiar API you use when using standard bullet.
Dyn4JAppState, trying to be like BullettAppState
dyn4JAppState = new Dyn4JAppState()
stateManager.attach(dyn4JAppState)Dyn4JShapeControl - Tries to behave like RigidBodyControl
private createBox(Vector2f location, Dyn4JAppState dyn4JAppState) {
Double boxSize = 0.5f;
// jME Geometry:
Geometry boxGeom = new Geometry("Box", new Box(new Float(boxSize), new Float(boxSize), 0.1f))
Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md")
mat.getAdditionalRenderState().setWireframe(true);
mat.setColor("Color", new ColorRGBA(new Float(255/255f),new Float(228/255f),new Float(225/255f), 1f))
boxGeom.setLocalTranslation(location.x, location.y, 0f)
boxGeom.setMaterial(mat)
rootNode.attachChild(boxGeom)
// The Control:
Dyn4JShapeControl physics = new Dyn4JShapeControl(
new Rectangle(new Float(boxSize*2), new Float(boxSize*2)), MassType.NORMAL,
100, //100 kg
0.8, // quite high friction
0) // not slippery
// Glue jME with Dyn4J:
boxGeom.addControl(physics) // <-- Let Dyn4JShapeControl handle the jme Geometry from now on.
dyn4JAppState.add(boxGeom)
}##Current state. Got solid item working (floor) and a couple of squares and circles bouncing on it. The controller is leaky, forcing you to use dyn4j internal classes. Player control seems working but primitive.
Run the tests in src/test/groovy to see what's up.
##Get it Check out the code and run the tests.
or add it to your project. The packaging may be bad, so feedback is apprichiated.
repositories {
maven {
url 'http://dl.bintray.com/johnsen/maven'
}
}
/*
...
*/
dependencies {
compile 'jme-dyn4j:jme-dyn4j:0.1'
}