This is the original code, com.jme3.math.Plane.reflect(Vector3f, Vector3f)
[java]public Vector3f reflect(Vector3f point, Vector3f store){
if (store == null)
store = new Vector3f();
float d = pseudoDistance(point);
store.set(normal).negateLocal().multLocal(d * 2f);
store.addLocal(point);
return store;
}[/java]
When called like plane.reflect(x, x); where x is used both as input and also as store the results are different (obviously if you read the above code), therefore the caller must be aware/on guard when doing this call, also Note similar methods that use in and store do work well when in == store (aka same reference)
testcase (search for “XXX:” to get to the relevant code) [used @alfinete 's code]:
[java]package org.jme3.forum;
import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.FastMath;
import com.jme3.math.Plane;
import com.jme3.math.Quaternion;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.shape.Box;
public class CopyOfMain extends SimpleApplication {
public static void main(String args) {
CopyOfMain app = new CopyOfMain();
app.start();
}
Node cosmos;
Node farAway;
Vector3f translationVector, translationUnityVector;
float myTimer = 0.0f;
Quaternion fromCameraRotation;
@Override
public void simpleInitApp() {
Box b = new Box(new Vector3f(620, 80, -300), 100, 100, 100);
Geometry geom = new Geometry("Box", b);
Material mat = new Material(assetManager,
"Common/MatDefs/Misc/SolidColor.j3md");
mat.setColor("m_Color", ColorRGBA.Blue);
geom.setMaterial(mat);
cosmos = new Node("cosmos");
farAway = new Node("farAway");
farAway.attachChild(geom);
cosmos.attachChild(farAway);
rootNode.attachChild(cosmos);
rootNode.setLocalScale(2, 3, 4);
rootNode.setLocalTranslation(2900f, -189f, 7718f);
rootNode.setLocalRotation(new Quaternion().fromAngles(
FastMath.DEG_TO_RAD * 81, FastMath.DEG_TO_RAD * 320,
FastMath.DEG_TO_RAD * 139));
translationVector = new Vector3f(-1200.0f, 1000.0f, 1600.0f);
farAway.setLocalTranslation(translationVector);
translationUnityVector = new Vector3f(translationVector.normalize());
cam.setFrustumFar(115000.0f);
Quaternion cameraRotation = new Quaternion();
cameraRotation.lookAt(translationUnityVector, Vector3f.UNIT_Y);
// COMMENT OUT ONE OF THESE TWO LINES TO TEST ONE METHOD OR THE OTHER.
// cam.setRotation(cameraRotation);
cam.lookAt(geom.localToWorld(b.getCenter(), null), Vector3f.UNIT_Y);
System.out.println(" Var translationUnityVector = "
- translationUnityVector);
System.out.println("Camera Direction (cam.getDirection) = " - cam.getDirection());
System.out.println("Quaternion to be sent to the camera = " - cameraRotation.toString());
System.out.println(" Quaternion retrieved from Camera = " - cam.getRotation().toString());
Vector3f x = translationVector.clone();
Vector3f y = translationVector.clone();
// geom.localToWorld(x, x);
// y = geom.localToWorld(y, null);
// System.out.println(x + "n" + y);
// geom.worldToLocal(x, x);
// y = geom.worldToLocal(y, null);
System.out.println("Initially: x=" + x + "nInitially: y=" + y);
// XXX:
Plane p = new Plane();
p.setNormal(translationUnityVector);
p.reflect(x, x);
y = p.reflect(y, null);
System.out.println("After: x=" + x + "nAfter: y=" + y);
}
@Override
public void simpleUpdate(float tpf) {
}
@Override
public void simpleRender(RenderManager rm) {
// TODO: add render code
}
}[/java]
output (on console):
Initially: x=(-1200.0, 1000.0, 1600.0)
Initially: y=(-1200.0, 1000.0, 1600.0)
After: x=(4800.0, -4000.0, -6400.0)
After: y=(1200.0, -1000.0, -1600.0)