s&box

HeavyAnvil.cs

A component that reacts to collisions like a heavy anvil. When a collision exceeds a speed threshold it optionally plays an impact sound, applies an upward/away impulse to a CharacterController, and applies a physics impulse to a Rigidbody on the other object.

Native Interop

using Sandbox;

public sealed class HeavyAnvil : Component, Component.ICollisionListener
{
    [Property] public float PushResistanceMultiplier { get; set; } = 0.25f;
    [Property] public float CrushSpeedThreshold { get; set; } = 300f;
    [Property] public float CrushImpactForce { get; set; } = 75000f;
    [Property] public SoundEvent ImpactSound { get; set; }

    public void OnCollisionStart( Collision collision )
    {
        if ( collision.Contact.Speed.Length < CrushSpeedThreshold ) return;

        var targetObj = collision.Other.GameObject?.Root;
        if ( !targetObj.IsValid() || targetObj == GameObject.Root ) return;

        if ( ImpactSound != null )
        {
            Sound.Play( ImpactSound, WorldPosition );
        }

        var cc = targetObj.Components.Get<CharacterController>();
        if ( cc.IsValid() )
        {
            var dir = (targetObj.WorldPosition - WorldPosition).Normal;
            dir.z = 0.5f;
            cc.Velocity += dir * 900f;
        }

        var rb = targetObj.Components.Get<Rigidbody>();
        if ( rb.IsValid() )
        {
            var dir = (targetObj.WorldPosition - WorldPosition).Normal;
            dir.z = 0.5f;
            rb.ApplyImpulse( dir * CrushImpactForce );
        }
    }
}