ghostControl.setPhysicsLocation() doesn’t work anymore?

Troubleshooting physics
1

Hey, maybe the method is just not supposed to work the way I’m trying to use it, but with nightly build 26-JAN-11 it worked fine. The GhostControl (mouthCollisionObj) object should be on a certain location at the model to detect collisions. Maybe someone would like to suggest a better procedure.

Here some code:



[java]

float x = playerPhysicsControl.getPhysicsLocation().x;

float y = playerPhysicsControl.getPhysicsLocation().y;



//Column one is the forward direction.

Vector3f rotationColumn1 = playerPhysicsControl.getPhysicsRotation().getRotationColumn(1);



//Synchronize position of the mouth collision object and the player position.

mouthCollisionObj.setPhysicsLocation(new Vector3f(x + rotationColumn1.x / 2.0f, y + rotationColumn1.y / 2.0f, 0));

[/java]



greetings

2

getPhysicsRotation now returns a Quaternion, otherwise not much has changed…

1 Like
3

EDIT: Maybe someone can help me with that knowledge: When I change the type of the object from GhostControl to RigidBodyControl, “setPhysicsLocation()” starts working properly again.



I’ve been looking for a problem in the code for 2 houres now and I can’t find anything. The only thing that has changed (besides that I’m using the most recent nightly build) is that I’m now in parallel mode and that I use “pSpace.enableDebug(assetManager);” instead of attaching debug shapes. But ghostControl.setPhysicsLocation seems to not work anymore. Every help or suggestion is highly appreciated :slight_smile:

4

Unfortunately I couldn’t solve this problem yet, so I’ve made some executable test code to support you supporting me :slight_smile:





[java]

import com.jme3.app.SimpleApplication;

import com.jme3.bullet.BulletAppState;

import com.jme3.bullet.collision.shapes.BoxCollisionShape;

import com.jme3.bullet.control.GhostControl;

import com.jme3.light.DirectionalLight;

import com.jme3.material.Material;

import com.jme3.math.ColorRGBA;

import com.jme3.math.Vector3f;

import com.jme3.scene.Geometry;

import com.jme3.scene.shape.Box;





public class Test extends SimpleApplication {



private BulletAppState bulletAppState;



private Box testBox;

private Geometry testGeom;

private GhostControl ghostControl;



/**

  • @param args

    */

    public static void main(String[] args) {



    Test app = new Test();

    app.setShowSettings(false);

    app.start();





    }



    public void simpleUpdate()

    {

    ghostControl.setPhysicsLocation(new Vector3f(2.0f, 0.0f, 0.0f));

    }



    @Override

    public void simpleInitApp() {



    flyCam.setEnabled(false);



    bulletAppState = new BulletAppState();

    bulletAppState.setThreadingType(BulletAppState.ThreadingType.PARALLEL);

    stateManager.attach(bulletAppState);



    ghostControl = new GhostControl(new BoxCollisionShape(new Vector3f(0.5f, 0.5f, 0.5f)));



    bulletAppState.getPhysicsSpace().enableDebug(assetManager);

    bulletAppState.getPhysicsSpace().add(ghostControl);



    testBox = new Box(new Vector3f(0.0f, 0.0f, 0.0f), 0.3f, 0.3f, 0.3f);

    testGeom = new Geometry(“Box”, testBox);

    Material mat = new Material(assetManager, “Common/MatDefs/Misc/SolidColor.j3md”);

    mat.setColor(“Color”, ColorRGBA.Red);

    testGeom.setMaterial(mat);

    testGeom.addControl(ghostControl);

    rootNode.attachChild(testGeom);



    //Make a test light.

    DirectionalLight sun = new DirectionalLight();

    sun.setDirection(new Vector3f(2.0f, 0.0f, -1.0f));

    rootNode.addLight(sun);

    }

    }

    [/java]



    Isn’t the ghostControl now supposed to be on the right-hand side of the box? If not, and someone can tell my why not, I can avoid the mistake I’m making.



    greetings
5

When you attach the Control to a spatial its moved with the Spatial, just use a PhysicsGhostObject or don’t attach the control.

1 Like
6

Puh, thank you very much man :slight_smile:

Last thing that bothers me now, the debug shape isn’t displayed anymore when I don’t attach the control or when I use a PhysicsGhostObject.

7

Yeah, only controls have debug shapes.