RectangleCollision.cs

public struct Rect {
    public Vector3 TopLeft, BottomRight;
    
    public bool Intersects(Rect other) {
        return !( this.TopLeft.X > other.BottomRight.X
               || this.TopLeft.Y > other.BottomRight.Y
               || this.TopLeft.Z > other.BottomRight.Z
               || this.BottomRight.X < other.TopLeft.X
               || this.BottomRight.Y < other.TopLeft.Y
               || this.BottomRight.Z < other.TopLeft.Z);
    }
}