Ue4 ??? ???? ??
- 1. ???? ??? ????????? ???(kulkal@thingsoft.com) ???? ?? ?? ??? UE4 ??? ???? ??
- 2. ?? 1. ???? 2. Global Illumination 3. VolumetricFog 4. Ambient Occlusion 5. QnA
- 4. UE4 Lightmass 3rd order SH Irradiance Volume 2nd order SH Lightmap Indirect Diffuse & Shadow Only Great quality & Low flexibility
- 5. UE4 Reflection Environment Compute Shader Tiled rendering Prefiltered cubemap for PBR UE4 ? Look ? ?? ??? ?? SSR ? ????? Specular ??
- 6. ????? ?? ??? ??? ?? ???. ??? ???? ?????? ???? SH Irradiance Volume ? ???
- 7. ????? ?? UV Seam ????(SH Volume, cubemap) ? ??? ??? ?????? ??? ??? ???? ??
- 8. ??? Global Illumination Light propagation volume Voxel cone tracing Enlighten
- 9. ??? ??? ? ?? ?? ???? ??? ???? UV ? ? ? ??. ??? ?? ??? ???. ??? ??? ???/??? ??? ??? ?? ??. ?? ?? ?? ???? ? ? ??? ?? ??. ???? ??? ?? ???? ??
- 10. Try #1 : Clipmap SH Irradiance Volume 3D Clipmap ? SH Irradiance Volume ? ??? ?? ???? CPU Octree SH + GPU 3d clip map : ??? ? ?? CPU ?? GPU Octree SH + GPU 3d clip map : ?????? ?? ???? ???
- 11. Try #2 : Tiled Diffuse Probe Blending UE4 reflection capture cubemap ?? 3rd order SH ? Projection UE4 Diffuse(??)
- 12. SH Projection GPU ?? SH Projection : ??? ??? ?? UE4 ? SkyLight Diffuse SH Projection ??? ?? 3rd Order Spherical Harmonics(9 float / channel)
- 13. Rendering Compute Shader tiled culling Reflection environment ?? ?? Interpolation ?? ?? (PrecomputedLightVolume ??) Probe ? Artist ??? (Color Tint, Intensity, Lighting Channel)
- 15. Overdraw? Tiled Rendering ? ?? ???? ??? Overdraw ??? ?? Cluster Rendering ?? ?? ? ?? ?
- 16. Probe Occlusion Light leak? Depth cubemap ?? visibility ?? :Probe ? ????? ? ??(???, ??) 2017 Nvidia GDC ?? Probe ?? Depth cubemap ? VSM?? Irradiance Probe ? Occlusion ?? ??:
- 17. Editor Tool ?? ??? ?? ? ?? ??? ??? ?? ??? ??(??) ?? ???(PPVolume) ???(PPVolume) ??( UE4??) ??? ?? ??? ULevel PostProcessVolume PostProcessVolume ULevel ULevel
- 18. ?? ?? ?????
- 19. ??? ??(GI ??)
- 20. ?? ? ??
- 21. Voxel based Volumetric Fog Volumetric Rendering ??? ??? Fog ? ??? Volumetric ??? ???? ?? ????? ?? ???? ??(??/??)
- 22. Fog Sheet Alpha Blending ??? ??? ?? ??
- 23. Dynamic Solution Geomtery ??2D Raymarching Inside Fallout 4
- 24. Voxel based Volumetric Fog Assasin creed 4 ? ???? Full Dynamic Screen Aligened Voxel Compute Shader Scattering ?? ?? ??? ?? ??
- 25. Shadow on Volumetric fog In-Scatterred Voxel ??? ??? PostProcess ?? ?? ??? ??? Volume Texture ??(Screen Aligned) CSM ESM ESM Shadow Projection ESM Sun Light Down sample & Blur In-Scatterred Voxel In-Scatterred Voxel CS Loop per voxel 2D Compute ShaderIn-Scatterred Voxel Out-Scattered Voxel
- 26. Voxel based Volumetric Fog Solving Scattering equation(?? ray(pixel 1 ?? CS Thread 1?) 2D compute shader [numthreads(4, 5, 1) DispatchComputeShader(Width/4, Height/5, 1) Z ?? ??? Loop
- 27. Aliasing ???(???) Exponential Shadow Map ???? ??? ??? ? Aliasing ??? Shadow map ? ?? ????? soft shadow ?? 6144x2048 CSM 768x256 ESM(Gaussian blurred)
- 28. Voxel based Volumetric Fog
- 29. Ambient Occlusion SSAO ? ???? ?? ??? ??
- 30. Two-Pass Rendering(HBAO+ Ultra) ? ??? ???? ?? ?? Halo ?? ??? ???? ?? AO ???? ?? Hbao+ Hbao+ Ultra
- 32. Two-Pass Rendering(HBAO+ Ultra) ?? ??? stencil bit 1 ?? AO ??? (?? ?? AO ????) ??? ??? stencil bit 2 BasePass ??
- 33. Two-Pass Rendering(HBAO+ Ultra) ?? AO ???(invert stencil 2, Min Blend, ??? AO ????) ??? AO ??? (stencil 2 ? ???, Overwrite, ??? AO ????)
- 34. Q & A
- 35. Reference https://mynameismjp.wordpress.com/2016/10/09/new-blog-series-lightmap-baking-and-spherical-gaussians/ Spherical harmonics ?? ?? ?? HBAO+ Ultra ???? ???? Volumetric fog ???? Spherical Gaussian ???? http://silviojemma.com/public/papers/lighting/spherical-harmonic-lighting.pdf http://www.ppsloan.org/publications/StupidSH36.pdf https://cseweb.ucsd.edu/~ravir/papers/envmap/envmap.pdf https://bartwronski.files.wordpress.com/2014/08/bwronski_volumetric_fog_siggraph2014.pdf http://developer.download.nvidia.com/gameworks/events/GDC2016/atatarinov_alpanteleev_advanced_ao.pdf
- 36. ?????? ? ??? ?? ?? ? ???? ?? ????. ?? ?? ? ?? ?? ????.
Editor's Notes
- #5: ?? ??? ?? ???. ????? ??? ???? ??????? ??? ?? ??? ????? ????? ???? ????? ?? ???? ???? ???? ?? ??? ???? ??(????? ?? ??)
- #8: ??? ?????? sh ? ??? ??? ???? uv ? ????? ??? ??? seam ? ??? ???, ?? ??? ?? ?? ? ??? ?? ???? ? ????? ???? ??? (??) ?? ??? ?????? ???? ???? ???? ???? ?? ??? ?? ? ? ??? ?????? ????. ???? ??? ??? ???? ??? ????? ??? ?
- #9: LPV ? Sh Irradiance ??? ????? ??? ?? ??? Voxel Contrace ? ??? Direct Lighting ? Voxelize ? ?? Contracing (ray ? ?? ???? ??? ??? ??????) ????? ????? ????? ??? ?(Specular ???, ?? ??????? ????? ??? ?? ??? ??? ??)
- #10: ?? ? ??? ?? ?? ????? ??? ?? ???? ??? ??? ???? ?????? ?? ?. UE4 ? precoputed lighting volume?? ???? ????? ?? ???? ???? ?? ??.2nd order sh, ??? 3rd order sh) ? ????? ?? ?? ?? ??? ??? ??? ?? ??.
- #11: ???? ????? ???, SH irradiance volume ? ?? ??? ??, Gpu clip ?? ?? ? ????? ?? ?? ?? ??? ?? ???? CPU Octree? ??, ??? ???? GPU ???? ???? ??? ???, GPU Octree ? ?? ??? ?? ???? ??? ??? cpu octree ??? ?? ??. ??? GPU Octree ? ?? ?? ???? ??, ???? ???? ?? ?? ??? ?? ??.
- #12: ????? gpu ?? pbr specular ? ?? ???? ???? ?????, diffuse irradiance sh ? ?????? ??? ??. ???? ??? ????? ???? ?? ???? ???? ????? ???? ? ?? diffuse sh ? ?? ReflectionEnvironment ? Tiled ????? ??? Diffuse SH ??? ??, ???? ?????? ?? ??? ???? ??? ??
- #13: ????? gpu ?? pbr specular ? ?? ???? ???? ?????, diffuse irradiance sh ? ?????? ??? ??. ???? ??? ????? ???? ?? ???? ???? ????? ???? ? ?? diffuse sh ? ?? ReflectionEnvironment ? Tiled ????? ??? Diffuse SH ??? ??, ???? ?????? ?? ??? ???? ??? ??
- #15: ???? ?????? ?? ??? ???? ??? ??
- #16: ????? gpu ?? pbr specular ? ?? ???? ???? ?????, diffuse irradiance sh ? ?????? ??? ??. ???? ??? ????? ???? ?? ???? ???? ????? ???? ? ?? diffuse sh ? ?? ReflectionEnvironment ? Tiled ????? ??? Diffuse SH ??? ??, ???? ?????? ?? ??? ???? ??? ??
- #17: ????? gpu ?? pbr specular ? ?? ???? ???? ?????, diffuse irradiance sh ? ?????? ??? ??. ???? ??? ????? ???? ?? ???? ???? ????? ???? ? ?? diffuse sh ? ?? ReflectionEnvironment ? Tiled ????? ??? Diffuse SH ??? ??, ???? ?????? ?? ??? ???? ??? ??
- #19: ??, ?? ????? ?? ???? ???? ????? ????? ????? ?? ???, ??? ??? ?? ??? UE4 ??? ??? ?? ? ???? ?? ??? ???? ?? ??? ?????, ??? ??? ????? ?? ??? ???? ??? ???? ??? ??? ???? ??? ??? ???? ?.
- #20: ??, ?? ????? ?? ???? ???? ????? ????? ????? ?? ???, ??? ??? ?? ??? UE4 ??? ??? ?? ? ???? ?? ??? ???? ?? ??? ?????, ??? ??? ????? ?? ??? ???? ??? ???? ??? ??? ???? ??? ??? ???? ?.
- #21: ??, ?? ????? ?? ???? ???? ????? ????? ????? ?? ???, ??? ??? ?? ??? UE4 ??? ??? ?? ? ???? ?? ??? ???? ?? ??? ?????, ??? ??? ????? ?? ??? ???? ??? ???? ??? ??? ???? ??? ??? ???? ?.
- #24: ??? ?????? raymarching ?? ???? ??, ????? ?? ?? ?? ??? ???? ???? ??? ??? ???? ??
- #25: ????? ??? ???? ?? ??, ??? Phase function ??. ??? ??? ?? ??? ??? ??? ???? ? ??????, ???? ??? ??? ????, ??? shading ??? ?? ??? ???? ???? ??? ??? ??.
- #26: ?? ???? ?? ??? ?? ESM ?? ?? ????, ??? ???, ???? ??? ?? Exponential shadow map?? ????. ESM ? ??? ??? ??? ??? ??? ?? ????? In-Scatter ???? ?????. ???? ??? ??? ??????/?????? In-scatter ???? ?????. ?? ???? 2D compute shader ? ??? (z ?? ?? ???? ????) Out-scatter ??(? ?? ??? In-scatter ???? ??? ?? ??? ???? ??)
- #27: ??? xy ?? ??? ??? ??? ??? 1?? ?? ??? ??? ?????? ? ??? ?.
- #28: ????? ????? d ? z ? ???? ?? ???? ??? ?????? VSM ? ??? ???, ???? ?? ???? ???? ?????? ??? ??? ???? ????? ???? ?? ???? ???.
- #30: ?? ??? ???? ???? ??? ???? ???? ??? ????? ???? ??, ?? ?????? ???. AO ? ???? ?? ???? ? ? ???? , ?? ????, AO ? ??? ???? ??? ???? ???? ?????? ???. ?????? ?? ?? ??? ????? AO ? ?? ???? ????? ??? ?? ?? ????, SSAO ?? ??? ??? ???? ???´..
- #31: ?????, ??? ???? ?? AO ? ????????? ???. ??? ?? ?? AO, ???? ?? ???? ?? ?? AO, ???? ? ??? ? ?? ?? ???? ?? DFAO ? ? ??? ????, voxe Cone tracing ? ???? ??? ???.
- #32: ?????, ??? ???? ?? AO ? ????????? ???. ??? ?? ?? AO, ???? ?? ???? ?? ?? AO, ???? ? ??? ? ?? ?? ???? ?? DFAO ? ? ??? ????, voxe Cone tracing ? ???? ??? ???.
- #33: ???? ????? ???? ???? ??? ???? ???? ?. ?? ??? ???? ????? ????? ??? AO ??? AO ? ??? ???? ???? ?? ??? ? ???? ??? ?? ??? ???(??? ??????? ?) (Hbao+ ultra ????? ???? ?? ???? ??)
- #34: ??? hbao ????? ???? ? ??? ??, ??? AO ? overwrite ? ao ??? ??? ?? AO ? Min Blend ? AO ??? ???(??? ??? ??? ?? ? ??) (??? ??? ??? 3 ????? ? ?? ??? ??? 2 ??)