Update on Polygon RayCasting

My previous post on 2D Polygon Raycasting had an error at the very end of it. It turns out that it is much more useful to return the surface normal of the object which is hit and not the reflection off this normal. Finding the reflection after wards is extremely easy to find later if you still need it by merely reflecting the ray direction off this normal. However, finding the edge normal given a resulting reflection and a ray direction is much more annoying to calculate.

The final code then turns out to be the following:

public static bool RayCast(Ray ray, Polygon polygon, float tmax, out float t, out Vector2 pt, out Vector2 normal)
        {
            t = float.MaxValue;
            pt = ray.Origin;
            normal = ray.Direction;
            
            // temp holder for segment distance
            float distance;
            int crossings = 0;

            for (int j = polygon.NumVertices - 1, i = 0; i < polygon.NumVertices; j = i, i++)
            {
                if (RayIntersectsSegment(ray, polygon.v[j], polygon.v[i], float.MaxValue, out distance))
                {
                    crossings++;
                    if (distance < t && distance <= tmax)
                    {
                        t = distance;
                        pt = ray.GetPoint(t);

                        Vector2 edge = polygon.v[j] - polygon.v[i];
                        normal = Vector2.Normalize(RightPerp(edge));
                        // no reflection here
                    }
                }
            }
            return crossings > 0 && crossings % 2 == 0;
        }