コード例 #1
0
ファイル: Scatter.cs プロジェクト: stella3d/weekend-tracer
        public static bool Dielectric(Ray r, HitRecord rec,
                                      ref float3 attenuation, ref Ray scattered, ref Random rand)
        {
            var    refractionIndex = rec.material.refractionIndex;
            float3 outwardNormal;
            float3 reflected = RayMath.Reflect(r.direction, rec.normal);
            float  niOverNt;

            attenuation = new float3(1f, 1f, 1f);
            float3 refracted;
            float  cosine;

            if (math.dot(r.direction, rec.normal) > 0f)
            {
                outwardNormal = -rec.normal;
                niOverNt      = refractionIndex;
                cosine        = refractionIndex * math.dot(r.direction, rec.normal) / math.length(r.direction);
            }
            else
            {
                outwardNormal = rec.normal;
                niOverNt      = 1f / refractionIndex;
                cosine        = -math.dot(r.direction, rec.normal) / math.length(r.direction);
            }

            var reflectProbability = RayMath.Refract(r.direction, outwardNormal, niOverNt, out refracted)
                ? RayMath.Schlick(cosine, refractionIndex) : 1f;

            scattered = rand.NextFloat() < reflectProbability
                ? new Ray(rec.p, reflected) : new Ray(rec.p, refracted);

            return(true);
        }
コード例 #2
0
ファイル: Scatter.cs プロジェクト: stella3d/weekend-tracer
        public static bool Metal(Ray r, HitRecord rec, ref float3 attenuation, ref Ray scattered, ref Random random)
        {
            var    m         = rec.material;
            float3 reflected = RayMath.Reflect(math.normalize(r.direction), rec.normal);

            scattered   = new Ray(rec.p, reflected + m.fuzziness * Utils.RandomInUnitSphere(random));
            attenuation = m.albedo;
            return(math.dot(scattered.direction, rec.normal) > 0);
        }