Evil MotionPathListener doesn't listen to!

Troubleshooting General Help
1

Hi,



MotionPathListener’s onWayPointReach() method seems not to be always triggered, which is very anoying in my game…



Here’s the code:



[java]

package mygame;



import com.jme3.app.SimpleApplication;

import com.jme3.cinematic.MotionPath;

import com.jme3.cinematic.MotionPathListener;

import com.jme3.cinematic.events.MotionTrack;

import com.jme3.light.DirectionalLight;

import com.jme3.material.Material;

import com.jme3.math.ColorRGBA;

import com.jme3.math.Vector3f;

import com.jme3.renderer.RenderManager;

import com.jme3.scene.Geometry;

import com.jme3.scene.Spatial;

import com.jme3.scene.shape.Box;

import com.jme3.system.AppSettings;



public class Main extends SimpleApplication {



DirectionalLight sun;

MotionPath path;

public static SimpleApplication sapp;



public static void main(String[] args) {

Main app = new Main();

sapp = (SimpleApplication) app;

AppSettings settings = new AppSettings(true);

settings.setFrameRate(60);

app.setSettings(settings);

app.start();

}



@Override

public void simpleInitApp() {

sun = new DirectionalLight();

sun.setDirection(new Vector3f(0,-1,0).normalizeLocal());

sun.setColor(ColorRGBA.White);

sapp.getRootNode().addLight(sun);



sapp.getCamera().lookAtDirection(new Vector3f(0,-1,0), new Vector3f(0,0,-1));

sapp.getCamera().setLocation(new Vector3f(0f,30f,0f));



Box box = new Box(Vector3f.ZERO, 1f,1f,1f);

Material mat = new Material(sapp.getAssetManager(), “Common/MatDefs/Misc/Unshaded.j3md”);

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

Spatial spatial = new Geometry(“test”, box);

spatial.setMaterial(mat);



sapp.getRootNode().attachChild(spatial);



path = new MotionPath();

float z = 10, x = 0, step = 1.5f;

path.addWayPoint(new Vector3f(x , -10 , z));

path.addWayPoint(new Vector3f(x , -10 , -z));

path.addWayPoint(new Vector3f(x , 0 , -z2/3));

path.addWayPoint(new Vector3f(x-step , 0 , -z1/3));

path.addWayPoint(new Vector3f(x+step , 0 , 0));

path.addWayPoint(new Vector3f(x-step , 0 , z1/3));

path.addWayPoint(new Vector3f(x+step , 0 , z2/3));

path.addWayPoint(new Vector3f(x-step , 0 , z));

path.addWayPoint(new Vector3f(x+step , 0 , z*4/3));



MotionTrack motionControl = new MotionTrack(spatial, path);

motionControl.setSpeed(2);

path.enableDebugShape(sapp.getAssetManager(), sapp.getRootNode());

// motionControl.setLoopMode(LoopMode.Loop);

motionControl.play();

}



@Override

public void simpleUpdate(float tpf) {

path.addListener( new MotionPathListener() {

public void onWayPointReach(MotionTrack control, int wayPointIndex) {

System.out.println("way point index: "+wayPointIndex);

}

});

}



@Override

public void simpleRender(RenderManager rm) {

//TODO: add render code

}

}



[/java]

2 Likes
2

Thanks for the test case, apparently the problem only occur when frame rate is low.

I’m gonna look into it and keep you informed.

3

I committed a fix. Next nightly should fix your issue.

4

All right, it works. Thank you.