Lock Z axis

Troubleshooting physics
21

@normen said: What you do there is bad voodoo btw, do not get().set() at any time in jme3!: I’ve heard so, but why? It usually works. edit: Could it be because the set method might include more operations than simply setting a variable? edit2: Changed the code

22

I believe the platform game Trine has this kind of physics; where movement in the z-direction is constrained.

23
Could it be because the set method might include more operations than simply setting a variable?

Yes, and even if there are none now there might be in the future, especially in physics (native bullet).
1 Like
24

if you don’t want movement in z-direction, then you can do:

[java]getPhysicsLocation().multLocal(1,1,0)[/java]

this makes all z values 0. And put it inside an update(float tpf); in a control for example.

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-.- what did I just say? xD Also, just setting the location might cause funny physics effects, you micro-beam the object basically…

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what did I just say?
Haha :p
Also, just setting the location might cause funny physics effects, you micro-beam the object basically..
Yeah, that's also the reason I didn't suggest that.
getPhysicsLocation().multLocal(1,1,0)
Why do multiplication when you can just set the value to 0?
I'ld still go with:
[java]
@Override
public void prePhysicsTick(PhysicsSpace space, float f) {
Vector3f linearVelocityVector = getLinearVelocity();
linearVelocityVector.z = 0;
setLinearVelocity(linearVelocityVector);
}
[/java]
1 Like
27

Not works :frowning: Object moves in jumps… O_o



// Edit:

O-M-G

Sorry, but m4tx is an idiot… -.-

[java] orbPhys = new RigidBodyControlZLock(1.5f);

orbPhys.setSpatial(orb);[/java]



I had this:

[java]orbPhys.setSpatial(orb);[/java]

Instead of:

[java]orbPhys.setCollisionShape(orbShape);[/java]



Eh… -.-

Now it works properly. Almost. Object is sometimes rotating around Z axis.

28

Use:

[java]

@Override

public void prePhysicsTick(PhysicsSpace space, float f){

Vector3f linearVelocityVector = getLinearVelocity();

Vector3f angularVelocityVector = getAngularVelocity();

linearVelocityVector.z = 0;

angularVelocityVector.x = 0;

angularVelocityVector.y = 0;

setLinearVelocity(linearVelocityVector);

setAngularVelocity(angularVelocityVector);

}

[/java]

or:

[java]

@Override

public void prePhysicsTick(PhysicsSpace space, float f){

Vector3f linearVelocityVector = getLinearVelocity();

Vector3f angularVelocityVector = getAngularVelocity();

linearVelocityVector.z = 0;

angularVelocityVector.z = 0;

setLinearVelocity(linearVelocityVector);

setAngularVelocity(angularVelocityVector);

}

[/java]

2 Likes
29

I use this first and it works :> Thanks for all!

30
I use this first and it works :> Thanks for all!
Glad to hear it finally worked out.