Camera Node - Gun!

Troubleshooting General Help
6

I created something like this for a ludum dare competition (it was adapted from the CamNode):

https://code.google.com/p/jme-ld24/source/browse/trunk/src/com/teamjmonkey/controls/WeaponFollowCamControl.java

Edit: Created a testcase for you guys

[java]package com.mmm.util.test;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Quaternion;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Spatial;
import com.jme3.scene.shape.Box;

public class TestFPSGun extends SimpleApplication {

private Spatial weapon;

public static void main(String[] args) {
    new TestFPSGun().start();
}

@Override
public void simpleInitApp() {

    // Weapon
    Box box = new Box(0.5f, 0.5f, 0.5f);
    weapon = new Geometry("geometry", box);
    Material unshadedMat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    weapon.setMaterial(unshadedMat);
    rootNode.attachChild(weapon);

    // Random thing
    Box box1 = new Box(2, 2, 2);
    Spatial box2 = new Geometry("geometry", box1);
    Material unshadedMat1 = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
    unshadedMat1.setColor("Color", ColorRGBA.Blue);
    box2.setMaterial(unshadedMat1);
    rootNode.attachChild(box2);
}

public void simpleUpdate(float tpf) {
    Vector3f vectorDifference = new Vector3f(cam.getLocation().subtract(weapon.getWorldTranslation()));
    weapon.setLocalTranslation(vectorDifference.addLocal(weapon.getLocalTranslation()));

    Quaternion worldDiff = new Quaternion(cam.getRotation().mult(weapon.getWorldRotation().inverse()));
    weapon.setLocalRotation(worldDiff.multLocal(weapon.getLocalRotation()));

    // Move it to the bottom right of the screen
    weapon.move(cam.getDirection().mult(3));
    weapon.move(cam.getUp().mult(-0.8f));
    weapon.move(cam.getLeft().mult(-1f));
    weapon.rotate(0.3f, FastMath.PI, 0);
}

}[/java]

Edit again: changed color of other box, so you can see easier

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