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| author | assiduous <assiduous@diligentgraphics.com> | 2020-08-26 05:44:34 +0000 |
|---|---|---|
| committer | assiduous <assiduous@diligentgraphics.com> | 2020-08-26 05:44:34 +0000 |
| commit | d4903eb8f5c018ad6813e04b0ad237cf5f692f67 (patch) | |
| tree | b33703efea66b81ef128638fdeda9abf31b5e81b /PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp | |
| parent | Epipolar scattering FX: added Ozone approximation that fixes yellow-green sky (diff) | |
| download | DiligentFX-d4903eb8f5c018ad6813e04b0ad237cf5f692f67.tar.gz DiligentFX-d4903eb8f5c018ad6813e04b0ad237cf5f692f67.zip | |
Light scattering FX: added custom Ozone absorption coefficient
Diffstat (limited to 'PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp')
| -rw-r--r-- | PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp b/PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp index 74ae2de..98308e3 100644 --- a/PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp +++ b/PostProcess/EpipolarLightScattering/src/EpipolarLightScattering.cpp @@ -2235,8 +2235,9 @@ void EpipolarLightScattering::PrepareForNewFrame(FrameAttribs& m_PostProcessingAttribs.fAerosolDensityScale != PPAttribs.fAerosolDensityScale || m_PostProcessingAttribs.fAerosolAbsorbtionScale != PPAttribs.fAerosolAbsorbtionScale || (PPAttribs.bUseCustomSctrCoeffs && - (m_PostProcessingAttribs.f4CustomRlghBeta != PPAttribs.f4CustomRlghBeta || - m_PostProcessingAttribs.f4CustomMieBeta != PPAttribs.f4CustomMieBeta) ); + (m_PostProcessingAttribs.f4CustomRlghBeta != PPAttribs.f4CustomRlghBeta || + m_PostProcessingAttribs.f4CustomMieBeta != PPAttribs.f4CustomMieBeta || + m_PostProcessingAttribs.f4CustomOzoneAbsorption != PPAttribs.f4CustomOzoneAbsorption) ); // clang-format on m_PostProcessingAttribs = PPAttribs; @@ -2624,20 +2625,27 @@ void EpipolarLightScattering::ComputeScatteringCoefficients(IDeviceContext* pDev f4RayleighExtinctionCoeff = f4TotalRayleighSctrCoeff; } - if (m_PostProcessingAttribs.bUseOzoneApproximation && !m_PostProcessingAttribs.bUseCustomSctrCoeffs) + if (m_PostProcessingAttribs.bUseOzoneApproximation) { // As noted in [1], taking into account ozone particle absorption is essential to reproduce // the blue of the zenith sky. Without ozone, the sky can appear too yellow overall, especially // at sunset/sunrise. Ozone should be concentrated 32km up in the sky, however the author suggests // to use the same distribution as the Rayleigh particle distribution, which allows simply adding - // ozone absorption to Rayleigh absorption. + // ozone absorption to Rayleigh extinction. // // 1. Physically Based Sky, Atmosphere and Cloud Rendering in Frostbite, Sebastien Hillaire // (Physically-Based Shading in Theory and Practice, Siggraph 2016) - // Add Ozone absorption coefficients from [1] to total Rayleigh extinction coefficient - const float4 f4OzoneAbsorption = float4{3.426f, 8.298f, 0.356f, 0.f} * 6e-7f; - m_MediaParams.f4RayleighExtinctionCoeff += f4OzoneAbsorption; + if (m_PostProcessingAttribs.bUseCustomSctrCoeffs) + { + m_MediaParams.f4RayleighExtinctionCoeff += m_PostProcessingAttribs.f4CustomOzoneAbsorption; + } + else + { + // Add Ozone absorption coefficients from [1] to total Rayleigh extinction coefficient + const float4 f4OzoneAbsorption = float4{3.426f, 8.298f, 0.356f, 0.f} * 6e-7f; + m_MediaParams.f4RayleighExtinctionCoeff += f4OzoneAbsorption; + } } // Calculate angular and total scattering coefficients for Mie scattering: |