Examples of vehicle games

TheCyberTrotter · May 16, 2021, 6:22am

I’ve been following forum posts and using TestFancyCar + TestPhysicsCar, but I can’t get the wheels to work / vehicle to move properly / models to load with collision detection at all times.

Also, I want to program an aircraft, but don’t know where to start. The physics doesn’t have to be great, just needs acceleration.

Any examples I can use for inspiration for aircrafts & vehicles?

sgold · May 16, 2021, 6:58am

Not a game, but should be helpful:

TheCyberTrotter · May 16, 2021, 7:00am

Yes (and I should have specified) but I’d like to use the native physics libraries & i dont want to use any extra classes – above is good but uses alot of extra classes

sgold · May 16, 2021, 7:02am

jme-vehicles uses native physics. Why don’t you want extra classes?

TheCyberTrotter · May 16, 2021, 7:05am

I don’t have alot of time to learn how the classes work (because there is a deadline I have to meet)-- I would love to use more but I’ve already studied VehicleControl + javadoc and so it would be alot easier for me to implement something with those

adi.barda · May 16, 2021, 8:15am

This is all you need for a fully working vehicles library wrapping the bullet classes:

dependencies {
    implementation 'com.github.stephengold:MaVehicles:0.6.1+for33'
    implementation 'com.github.stephengold:Minie:4.1.0+for33'
}

It’s just the core library, not a whole game to learn. I use it in my project. works extremely well and easy to use.

adi.barda · May 16, 2021, 8:22am

Regarding the aircraft, maybe just setting the RigidBodyControl’s linear velocity in the forward direction will be enough for you:

float velocity=5.0f;
RigidBodyControl ctl = [find your RigidBodyControl]; 
Vector3f forward = [your node containing the above RigidBodyControl].getLocalRotation().mult(Vector3f.UNIT_Z);
ctl.setLinearVelocity(forward.mult(velocity.floatValue()));

sgold · May 16, 2021, 4:10pm

What are you doing differently from TestFancyCar?

sgold · May 16, 2021, 4:21pm

For flight simulation, see

TheCyberTrotter · May 16, 2021, 11:22pm

I am using a different model.

Also @sgold is there a .jar file for MavCommon (the one with the examples)?
I cannot use gradle for my project.

Pavl_G · May 17, 2021, 12:03am

Vehicles using jme base classes (Minie) + Nitros + jump forces :

Main code :

github.com

Monkey-Droid/Superior-Extended-Engine/blob/6c2920a9d5adf47172e1f21e49ffb94fbb0dafb9/demoApp/src/main/java/com/myGame/JmEGamePadExample/JmeGame.java#L236


      
          private void addEnvLightProbe(){
              EnvironmentCamera envCam=new EnvironmentCamera();
              stateManager.attach(envCam);
              envCam.initialize(stateManager,this);
              LightProbe lightProbe=LightProbeFactory.makeProbe(envCam,rootNode);
              lightProbe.getArea().setRadius(500);
              lightProbe.setPosition(new Vector3f(0,20,0));
              rootNode.addLight(lightProbe);
          }
          
          private void buildPlayer() {
              cam.setFrustumFar(500f);
              Material mat = new Material(getAssetManager(), "Common/MatDefs/Misc/Unshaded.j3md");
              mat.getAdditionalRenderState().setWireframe(false);
              mat.setColor("Color", ColorRGBA.Black);
          
              //create a compound shape and attach the BoxCollisionShape for the car body at 0,1,0
              //this shifts the effective center of mass of the BoxCollisionShape to 0,-1,0
              CompoundCollisionShape compoundShape = new CompoundCollisionShape();
              BoxCollisionShape box = new BoxCollisionShape(new Vector3f(4.2f, 0.8f, 4.5f));

Linear Nitro :

github.com

Monkey-Droid/Superior-Extended-Engine/blob/6c2920a9d5adf47172e1f21e49ffb94fbb0dafb9/demoApp/src/main/java/com/myGame/JmEGamePadExample/JmeGame.java#L109


      
                  ControlButtonsView controlButtonsView=appCompatActivity.findViewById(R.id.gamePadbtns);
                      controlButtonsView.addControlButton("X",ControlButtonsView.GAMEPAD_BUTTON_X,ControlButtonsView.DEFAULT_BUTTONS,ControlButtonsView.X_BUTTON_ALPHA)
                      .setOnClickListener(v -> appCompatActivity.startActivity(new Intent(appCompatActivity.getApplicationContext(), LanLogic.class)));
                      controlButtonsView.addControlButton("Y",ControlButtonsView.GAMEPAD_BUTTON_Y,ControlButtonsView.DEFAULT_BUTTONS,ControlButtonsView.Y_BUTTON_ALPHA);
                      controlButtonsView.addControlButton("A",ControlButtonsView.GAMEPAD_BUTTON_A,ControlButtonsView.DEFAULT_BUTTONS,ControlButtonsView.A_BUTTON_ALPHA)
                      .setOnClickListener(v -> {
                              vehicle.applyCentralImpulse(jumpForce);
                      });
                      controlButtonsView.addControlButton("B",ControlButtonsView.GAMEPAD_BUTTON_B,ControlButtonsView.DEFAULT_BUTTONS,ControlButtonsView.B_BUTTON_ALPHA)
                      .setOnClickListener(v -> {
                              vehicle.applyCentralImpulse(vehicle.getLinearVelocity().mult(150));
                              Node nitroNode=((Node)((Node) chassis).getChild("nitro"));
                              NitroState nitroState=new NitroState(assetManager,nitroNode,Vector3f.UNIT_Z.negate(),"nitroEffect",new ColorRGBA(0f, 1f, 1f, 0.8f),new ColorRGBA(251f / 255f, 130f / 255f, 0f, 0.1f));
                              nitroState.setViewPort(viewPort);
                              stateManager.attach(nitroState);
                      });
              }
          
              @Override
              public void destroy() {
          //        /* deInitializeSensor Service on app exit , to be used with other apps */

Effect :

github.com

Monkey-Droid/Superior-Extended-Engine/blob/6c2920a9d5adf47172e1f21e49ffb94fbb0dafb9/demoApp/src/main/java/com/myGame/JmeEffects/NitroState.java#L14


      
          import com.jme3.asset.AssetManager;
          import com.jme3.effect.ParticleEmitter;
          import com.jme3.effect.ParticleMesh;
          import com.jme3.material.Material;
          import com.jme3.math.ColorRGBA;
          import com.jme3.math.FastMath;
          import com.jme3.math.Vector3f;
          import com.jme3.renderer.ViewPort;
          import com.jme3.scene.Node;
          
          public class NitroState extends BaseAppState {
              private final AssetManager assetManager;
              private final Node nitroNode;
              private final String effectName;
              private final Vector3f gravity;
              private final float limitationTime=3f;
              private float counter=0.0f;
              private final ColorRGBA colorRGBA1;
              private final ColorRGBA colorRGBA2;
              private ViewPort viewPort;
              private MotionEffect motionEffect;

You can do both of them in the same class

Please donot copy those classes, use them as a reference because there are android parts embedded at the top, you will get red lines if you do on jme SDK.

Pavl_G · May 17, 2021, 12:06am

Let us know what are the specifications you want to add to your vehicles…other than aircrafts…

sgold · May 17, 2021, 5:44am

There’s no MavCommon JAR available for download, but you could easily build one, by cloning the repo and executing the Gradle wrapper:

sgold:~/Git/jme-vehicles$ ./gradlew :MavCommon:jar
Starting a Gradle Daemon (subsequent builds will be faster)

BUILD SUCCESSFUL in 29s
4 actionable tasks: 4 executed
sgold:~/Git/jme-vehicles$ ls MavCommon/build/libs
MavCommon.jar
sgold:~/Git/jme-vehicles$

TheCyberTrotter · May 26, 2021, 5:55am

Thank you @sgold @Pavl_G. Sorry for the late reply.

I will implement this in my project. Are there any projects of vehicle control / simple projects (no extra libraries) that can drive vehicles?

Thanks!

sgold · May 26, 2021, 12:25pm

The jme3-examples project includes 4 very simple applications involving vehicles: TestAttachDriver, TestFancyCar, TestPhysicsCar, and TestHoveringTank.

https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-examples/src/main/java/jme3test/bullet