[Felgo User]

The documentation says:

The <i>contactNormal</i> vector contains the information if the 2 objects collided on the horizontal axis (if contactNormal.x is 1 or -1) or on the vertical axis (if contactNormal.y is 1 or -1). The non-affected axis will be 0.

but the real value is not the contactNormal, seem It’s the contactPoint

[GüntherFelgo Team]

Hi!
The contactNormal property directly holds the normal vector coming from Box2D and should work as described here:
http://www.iforce2d.net/b2dtut/collision-anatomy

(see chapter “Collision points and the normal”)

Best,
Günther

[Felgo User]

Well, the problem is that when I say

 

fixture.onBeginContact: {

console.log(contactNormal)

}

The log prits something like QPointF(-25.3125, 0)

The x value moves from -25.3125 to 25.3125 depending on the position of the objects and de direction of the collision.

the y value is always 0.

any idea of what I’m doing worng?

 

Thank you

[GüntherFelgo Team]

Hi!

As the value for the contact normal directly comes from Box2D it could be possible that the values you receive are just how Box2D works in your specific use-case. For example, the y-value is 0 if your object e.g. collides with a vertical wall.

If this is not the case in your game it is hard to tell what is going wrong. You can prepare a small code-example for us in that case so we can do some more testing to see if we can identify the problem.

Best,
Günther