tsukihiができるまで #レイトレ合宿4

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1. CPU RENDER tsukihi Sho Hosoda / @gam0022

2. None

3. UTVLJIJ
   ͕Ͱ͖Δ·Ͱ 1

4. ͓୊ “Rendering a beautiful image within 5 minutes.”

5. ϨΠϚʔνϯά×ύετϨʔγϯά ̑෼Ͳ͜Ζ͔ ̑࣌ؒͩͬͨ…

6. Ͳ͏΍ͬͯ
   ̑෼Ҏ಺ʹඳը͢Δʁ

7. ४උ࣌ؒ΋
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8. ઓུ ٖࣅදݱͰޡຐԽͦ͏ʂ

9. UTVLJIJ
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10. ⁞
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11. ⁞
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13. struct RaymarchingSphere : public RaymarchingObject { public: RaymarchingSphere(const Vec3 &position,

    const double scale, const Color &emission, const Color &color, const ReflectionType reflection_type) : RaymarchingObject(position, scale, emission, color, reflection_type) { } double distanceFunction(const Vec3 &p) const { return length(p - position) - scale; } }; code ϨΠϚʔνϯάͷΦϒδΣΫτͷఆٛ 3BZNBSDIJOH0CKFDU
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14. const double mengerSpongeLoop(const Vec3& p) const { double d =

    0.0; const double one_third = 1.0 / 3.0; for (int i = 0; i < 4; i++) { double k = pow(one_third, i); double kh = k * 0.5; d = std::max(d, -crossBar(mod(p + kh, k * 2.0) - kh, k * one_third)); } return d; } code ϝϯΨʔͷεϙϯδͷແݶ൛ͷڑ཭ؔ਺

15. ⁞
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21. inline double calcAO(const Vec3 pos, const Vec3 normal) { double

    k = 1.0, occluded = 0.0; for (int i = 0; i < 5; i++) { double length = 1.5 * i; double distance = map(normal * length + pos); occluded += (length - distance) * k; k *= 0.3; } return clamp(1.0 - occluded, 0.0, 1.0); } code ٖࣅ
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23. ٖࣅίʔςΟΫε ٖࣅίʔςΟΫε ύετϨʔγϯάʹΑΔ
    ίʔςΟΫε

24. inline double calcCaustics(const Vec3 pos, const Vec3 light_dir, const double

    distance) { for (int i = 0; i < 20; i++) { Vec3 p = pos + light_dir * depth_to_refraction; d_to_refraction = refraction_map(p); if (std::abs(distance - depth_to_refraction) < kEPS || depth_to_refraction > depth_to_other) break; if (std::abs(d_to_refraction) < kEPS) { Vec3 n = calcRefractionNormal(p); return 1.0 + pow(1.07 * std::max(dot(n, -light_dir), 0.0), 100.0); } depth_to_refraction += d_to_refraction; } return 1.0; } code ٖࣅίʔςΟΫε

25. ٖࣅίʔςΟΫε w EPU O
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    w ୯७ͳ಺ੵ͕ͩɺٿମʹݶΓͦΕͬΆ͘ͳΔ
    w ಾͷͱ͍͏ఆ਺ return 1.0 + pow(1.07 * std::max(dot(n, -light_dir), 0.0), 100.0);

26. 1280x960px 4spp 37.24sec @Core i7-6700K 4core ෼Λେ͖͘Լճͬͨʂ

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