not work

Code/Base/Wheel/Suspension/Hinge.cs

@@ -0,0 +1,26 @@
+using System;
+
+namespace VeloX;
+
+internal readonly struct Hinge( Vector3 hinge_anchor, Vector3 hinge_arm )
+{
+	[Description( "the point that the wheels are rotated around as the suspension compresses" )]
+	public readonly Vector3 Anchor = hinge_anchor;
+
+	[Description( "anchor to wheel vector" )]
+	public readonly Vector3 Arm = hinge_arm;
+
+	[Description( "arm length squared" )]
+	public readonly float LengthSquared = hinge_arm.Dot( hinge_arm );
+
+	[Description( "1 / arm length in hinge axis normal plane" )]
+	public readonly float NormXY = 1 / MathF.Sqrt( hinge_arm.x * hinge_arm.x + hinge_arm.y * hinge_arm.y );
+
+	public readonly Vector3 Rotate( float travel )
+	{
+		float z = Arm.z + travel;
+		float lengthSq = MathF.Max( LengthSquared - z * z, 0.0f );
+		float nxy = NormXY * MathF.Sqrt( lengthSq );
+		return Anchor + new Vector3( Arm.x * nxy, Arm.y * nxy, z );
+	}
+}