물

• https://ateliersera.blog.me/220413097549

• https://www.ronja-tutorials.com/2018/11/03/river.html

• https://alexanderameye.github.io/simple-water.html

• https://darkcatgame.tistory.com/30?category=806332

• https://github.com/simplestargame/UniversalOceanShaderGraph

• https://www.gamedeveloper.com/programming/water-interaction-model-for-boats-in-video-games-part-2

• https://www.e2gamedev.com/water-buoyancy

• Acerola - Rendering Water With Sine Waves

• Acerola - I Tried Simulating The Entire Ocean

• Ocean waves simulation with Fast Fourier transform

• Very fast procedural ocean

• http://peerplay.nl/ripple-water-shader/

• rain

  • https://tympanus.net/codrops/2015/11/04/rain-water-effect-experiments/

• 위치

  • sin을 이용한 리니어 방식
    • linear wave : y = y - Amplitude * sin(Frequency * x - Phase)
  • noise를 이용한 방식

• 디테일

  • 노말맵
    • 1장 - 단조로움
    • 2장 - 역방향으로 하고 합친다
      • n = n1 + n2 * 0.5 * (0.5, 0.5, 1)
  • 버텍스칼라 가중치

• 주의해야할 점

  • 너무 단순히 만들면 타일링 패턴으로, 부자연스럽게 보임

바다/강

• 특징 짚기
  • 물결
  • 거품
    • sea form
      • 오브젝트 상호작용은 깊이맵 이용
    • sea spray
  • 거리 가까울때 투명
  • 거리 멀때 거울처럼 반사
    • cubemap ? Planar Reflection
  • 수면 아래 Caustic
    • 카메라 앞에 커스틱 매쉬를 둬서 처리

셰이더 참고 단어

Ref

• gpugems 1

  • Chapter 1. Effective Water Simulation from Physical Models
  • Chapter 2. Rendering Water Caustics
  • Chapter 42. Deformers

• gpugems 2

  • Chapter 18. Using Vertex Texture Displacement for Realistic Water Rendering
    • 번역

• Boat Attack

  • https://github.com/Unity-Technologies/BoatAttack
  • 모바일 플랫폼을 위한 URP에서의 물 표현. 모바일 플랫폼을 위한 물 표현 (1/6)
  • 2 Gerstner wave - 카메라를 따라다니게
  • 3 Planar Reflection
  • 4 Caustic - 카메라를 따라다니게
  • 5 Fresnel

• https://en.wikipedia.org/wiki/Trochoidal_wave

• Water Caustics Shader - Unity

  • https://github.com/z4gon/water-caustics-shader-unity

• Deep-Water Animation and Rendering

  • https://www.semanticscholar.org/paper/Deep-Water-Animation-and-Rendering-Jensen-Goli%C3%A1%C5%A1/b82acf6a543aff6a3581b1e7ad02efb88b501750
  • 번역

• https://catlikecoding.com/unity/tutorials/flow/waves/

• [SIGGRAPH2018] The Technical Art of Sea of Thieves

  • https://history.siggraph.org/learning/the-technical-art-of-sea-of-thieves/

float3 GerstnerWave (
      float4 wave,
      float3 p,
      inout float3 tangent,
      inout float3 binormal)
{
  float steepness = wave.z;
  float wavelength = wave.w;
 
  float  k = 2 * UNITY_PI / wavelength;
  float  c = sqrt(9.8 / k);
  float2 d = normalize(wave.xy);
  float  f = k * (dot(d, p.xz) - c * _Time.y);
  float  a = steepness / k;
  
  float sinf;
  float cosf;
  sincos(f, sinf, cosf);

  tangent += float3(
    -d.x * d.x * (steepness * sinf),
    d.x * (steepness * cosf),
    -d.x * d.y * (steepness * sinf)
  );
  binormal += float3(
    -d.x * d.y * (steepness * sinf),
    d.y * (steepness * cosf),
    -d.y * d.y * (steepness * sinf)
  );
  
  return float3(
    d.x * (a * cosf),
    a * sinf,
    d.y * (a * cosf)
  );
}

퓨리에변환 fourier transform https://en.wikipedia.org/wiki/Fourier_transform

웨블레트 (Wavelet) 웨이블릿이란 0을 중심으로 증가와 감소를 반복하는 진폭을 수반한 파동 같은 진동을 말한다

phillips spectrum https://github.com/Scrawk/Phillips-Ocean