Instances (인스턴스)

__device__ inline Hittable* MakeBox(const Point3& a, const Point3& b, Material* mat) { Point3 min(fmin(a.X(), b.X()), fmin(a.Y(), b.Y()), fmin(a.Z(), b.Z())); Point3 max(fmax(a.X(), b.X()), fmax(a.Y(), b.Y()), fmax(a.Z(), b.Z())); Vector3 dx(max.X() - min.X(), 0, 0); Vector3 dy(0, max.Y() - min.Y(), 0); Vector3 dz(0, 0, max.Z() - min.Z()); Hittable** sides = new Hittable*[6]; sides[0] = new Quad(Point3(min.X(), min.Y(), max.Z()), dx, dy, mat); // front sides[1] = new Quad(Point3(max.X(), min.Y(), max.Z()), -dz, dy, mat); // right sides[2] = new Quad(Point3(max.X(), min.Y(), min.Z()), -dx, dy, mat); // back sides[3] = new Quad(Point3(min.X(), min.Y(), min.Z()), dz, dy, mat); // left sides[4] = new Quad(Point3(min.X(), max.Y(), max.Z()), dx, -dz, mat); // top sides[5] = new Quad(Point3(min.X(), min.Y(), min.Z()), dx, dz, mat); // bottom return new HittableList(sides, 6, true); // true = 6개 Quad + 배열을 소유 }

list[i++] = MakeBox(Point3(130, 0, 65), Point3(295, 165, 230), white); list[i++] = MakeBox(Point3(265, 0, 295), Point3(430, 330, 460), white);

class Translate : public Hittable { public: __device__ Translate(Hittable* object, const Vector3& offset) : mObject(object), mOffset(offset) { // 자식 경계 상자도 옮겨 둔다. 안 옮기면 BVH 슬랩 검사가 엉뚱한 곳을 // 보고 레이를 조기 기각한다. mBBox = object->BoundingBox() + offset; } __device__ ~Translate() override { delete mObject; } // 소멸자 연쇄 __device__ bool Hit(const Ray& ray, double tMin, double tMax, HitRecord& rec) const override { Ray offsetRay(ray.Origin() - mOffset, ray.Direction(), ray.Time()); // 1) 레이 -offset if (!mObject->Hit(offsetRay, tMin, tMax, rec)) // 2) 교차 검사 return false; rec.P += mOffset; // 3) 교점 +offset return true; } __device__ Aabb BoundingBox() const override { return mBBox; } private: Hittable* mObject; Vector3 mOffset; Aabb mBBox; };

__host__ __device__ inline Aabb operator+(const Aabb& bbox, const Vector3& offset) { return Aabb(bbox.X + offset.X(), bbox.Y + offset.Y(), bbox.Z + offset.Z()); } __host__ __device__ inline Aabb operator+(const Vector3& offset, const Aabb& bbox) { return bbox + offset; }

__host__ __device__ inline Interval operator+(const Interval& ival, double displacement) { return Interval(ival.Min + displacement, ival.Max + displacement); } __host__ __device__ inline Interval operator+(double displacement, const Interval& ival) { return ival + displacement; }

x' = cosθ·x + sinθ·z z' = -sinθ·x + cosθ·z

class RotateY : public Hittable { public: __device__ RotateY(Hittable* object, double angle) : mObject(object) { double radians = angle * 3.1415926535897932385 / 180.0; // 디바이스 라디안 변환 mSinTheta = sin(radians); mCosTheta = cos(radians); mBBox = object->BoundingBox(); // 자식 AABB의 8개 꼭짓점을 모두 회전시켜, 회전 후를 감싸는 새 AABB를 구한다. Point3 min(DBL_MAX, DBL_MAX, DBL_MAX); Point3 max(-DBL_MAX, -DBL_MAX, -DBL_MAX); for (int i = 0; i < 2; i++) for (int j = 0; j < 2; j++) for (int k = 0; k < 2; k++) { double x = i*mBBox.X.Max + (1-i)*mBBox.X.Min; double y = j*mBBox.Y.Max + (1-j)*mBBox.Y.Min; double z = k*mBBox.Z.Max + (1-k)*mBBox.Z.Min; double newx = mCosTheta*x + mSinTheta*z; double newz = -mSinTheta*x + mCosTheta*z; Vector3 tester(newx, y, newz); for (int c = 0; c < 3; c++) { min[c] = fmin(min[c], tester[c]); max[c] = fmax(max[c], tester[c]); } } mBBox = Aabb(min, max); } __device__ ~RotateY() override { delete mObject; } __device__ bool Hit(const Ray& ray, double tMin, double tMax, HitRecord& rec) const override { // 레이를 월드 → 오브젝트 공간으로 회전(-θ). Point3 origin( (mCosTheta*ray.Origin().X()) - (mSinTheta*ray.Origin().Z()), ray.Origin().Y(), (mSinTheta*ray.Origin().X()) + (mCosTheta*ray.Origin().Z())); Vector3 direction( (mCosTheta*ray.Direction().X()) - (mSinTheta*ray.Direction().Z()), ray.Direction().Y(), (mSinTheta*ray.Direction().X()) + (mCosTheta*ray.Direction().Z())); Ray rotatedRay(origin, direction, ray.Time()); if (!mObject->Hit(rotatedRay, tMin, tMax, rec)) return false; // 교점을 오브젝트 → 월드 공간으로 되돌린다(+θ). rec.P = Point3( (mCosTheta*rec.P.X()) + (mSinTheta*rec.P.Z()), rec.P.Y(), (-mSinTheta*rec.P.X()) + (mCosTheta*rec.P.Z())); // 법선도 같은 식으로 회전. rec.Normal = Vector3( (mCosTheta*rec.Normal.X()) + (mSinTheta*rec.Normal.Z()), rec.Normal.Y(), (-mSinTheta*rec.Normal.X()) + (mCosTheta*rec.Normal.Z())); return true; } __device__ Aabb BoundingBox() const override { return mBBox; } private: Hittable* mObject; double mSinTheta; double mCosTheta; Aabb mBBox; };

class Hittable { public: __device__ virtual ~Hittable() {} // Translate→RotateY→HittableList→Quad 연쇄 해제 __device__ virtual bool Hit(const Ray&, double, double, HitRecord&) const = 0; __device__ virtual Aabb BoundingBox() const = 0; __device__ virtual bool IsBvhNode() const { return false; } };

else // sceneId == 7, cornell_box (두 회전 상자) { Material* red = new Lambertian(Color(0.65, 0.05, 0.05)); Material* white = new Lambertian(Color(0.73, 0.73, 0.73)); Material* green = new Lambertian(Color(0.12, 0.45, 0.15)); Material* light = new DiffuseLight(Color(15, 15, 15)); // 5벽 + 천장 광원 (scene 6과 동일) list[i++] = new Quad(Vector3(555,0,0), Vector3(0,555,0), Vector3(0,0,555), green); list[i++] = new Quad(Vector3(0,0,0), Vector3(0,555,0), Vector3(0,0,555), red); list[i++] = new Quad(Vector3(343,554,332), Vector3(-130,0,0), Vector3(0,0,-105), light); list[i++] = new Quad(Vector3(0,0,0), Vector3(555,0,0), Vector3(0,0,555), white); list[i++] = new Quad(Vector3(555,555,555), Vector3(-555,0,0), Vector3(0,0,-555), white); list[i++] = new Quad(Vector3(0,0,555), Vector3(555,0,0), Vector3(0,555,0), white); // 키 큰 상자: 15° 회전 후 (265,0,295)로 이동 Hittable* box1 = MakeBox(Point3(0,0,0), Point3(165,330,165), white); box1 = new RotateY(box1, 15.0); box1 = new Translate(box1, Vector3(265, 0, 295)); list[i++] = box1; // 키 작은 상자: -18° 회전 후 (130,0,65)로 이동 Hittable* box2 = MakeBox(Point3(0,0,0), Point3(165,165,165), white); box2 = new RotateY(box2, -18.0); box2 = new Translate(box2, Vector3(130, 0, 65)); list[i++] = box2; background = Color(0, 0, 0); lookfrom = Vector3(278,278,-800); lookat = Vector3(278,278,0); vfov = 40.0; }