/// <summary>
/// Refract a ray
/// </summary>
/// <param name="ray"></param>
/// <param name="hit"></param>
/// <returns></returns>
public static Ray Refract(Ray ray, RayHit hit)
{
float eta = ray.isOutside()
? hit.Obj.Material.RefractionIndex / Constants.LIGHT_IOR
: Constants.LIGHT_IOR / hit.Obj.Material.RefractionIndex; // TODO: cache both
var dir = QuickMaths.Refract(ray.Direction, hit.Normal, eta);
short outside = (short)(hit.Obj.IsVolumetric ? (ray.isOutside() ? -1 : 1) : 1);
return(new Ray(hit.Position + dir * Constants.EPSILON, dir, outside, ray.Depth + 1, ray.Refldepth));
}
/// <summary>
/// Reflect a ray
/// </summary>
/// <param name="ray"></param>
/// <param name="hit"></param>
/// <returns></returns>
public static Ray Reflect(Ray ray, RayHit hit)
{
var dir = QuickMaths.Reflect(ray.Direction, hit.Normal);
return(new Ray(hit.Position + dir * Constants.EPSILON, dir, ray.Outside, ray.Depth + 1, ray.Refldepth + 1));
}
