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Point-to-Point Joint

The Point-to-Point Joint limits the translation such that the pivot points between the two rigid bodies match in world space. You can use the Point-to-Point Joint to create effects such as a chain-link or to pin objects together.

FixedJoint3D

In Evergine, a Point-to-Point Joint is implemented using the PointToPointJoint3D component.

Properties

Property	Default	Description
ConnectedEntityPath	null	The entity path of the connected body. A joint is established properly only when the path is valid.
Anchor	0, 0, 0	The point that defines the center of the joint in the source entity local space. All physics-based simulations use this point as the center in calculations.
AutoConfigureConnected	true	Enable this setting to automatically calculate the ConnectedAnchor's position to match the global position of the anchor property. This is the default setting. Disable it to configure the position of the connected anchor manually.
ConnectedAnchor	auto-calculated	Manually configure the connected anchor position in the connected body's local space.
BreakPoint	0	If the value is greater than 0, it indicates the force that needs to be applied for this joint to break.
CollideConnected	false	Determines whether a collision between the two bodies managed by the joint is enabled.

Using the Point-to-Point Joint

This snippet creates two bodies and adds a fixed joint, maintaining the relative position from the start. This is because the AutoConfigureConnected property is set to true.

protected override void CreateScene()
{
    // Load your material
    var cubeMaterial = this.Managers.AssetSceneManager.Load<Material>(EvergineContent.CrateMat);

    int chainLength = 6;
    Entity previousLink = null;

    // Create the chain...
    for (int i = 0; i < chainLength; i++)
    {
        // The first object is kinematic (we don't want a falling chain :D)
        var rigidObjectType = (i == 0) ? RigidBodyType3D.Kinematic : RigidBodyType3D.Dynamic;

        // Create the link entities...
        var link = this.CreateCube(cubeMaterial, new Vector3(i, 0, 0), 0.75f, rigidObjectType);

        if (previousLink != null)
        {
            // Add a PointToPoint joint to the previous link connected to the current link...
            previousLink.AddComponent(new PointToPointJoint3D()
            {
                ConnectedEntityPath = link.EntityPath,
            });
        }

        previousLink = link;

        this.Managers.EntityManager.Add(link);
    }
}

private Entity CreateCube(Material material, Vector3 position, float size, RigidBodyType3D rigidBodyType)
{
    Entity cube = new Entity()
        .AddComponent(new Transform3D()
        {
            Position = position
        })
        .AddComponent(new MaterialComponent() { Material = material })
        .AddComponent(new CubeMesh() { Size = size })
        .AddComponent(new MeshRenderer())

        .AddComponent(new RigidBody3D()  // Add a RigidBody3D component...
        {
            PhysicBodyType = rigidBodyType
        })
        .AddComponent(new BoxCollider3D());  // Add a BoxCollider3D to the physic body...

    return cube;
}