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Graphics Programming weekly - Issue 90 — June 23, 2019

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jendrikillner

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  • explains gamut mapping techniques
  • difference perceptual and clipping techniques
  • shows how gamut mappings are derived
fs2_gamut_ab_view.png
  • shows how the fog in The Witcher 3 has been implemented
  • combines aerial fog and an artist-controlled fog coloring based on a gradient from 3 colors (front to back)
  • uses AO information to darken the fog in occluded areas
01_scene.jpg

  • list of sessions from SIGGRAPH 2019 that are related to ray tracing techniques
SIGGRAPH2019.png
  • new extensions in AMD driver
  • VK_EXT_full_screen_exclusive, allows application to enter fullscreen mode such as IDXGISwapChain::SetFullscreenState
  • VK_EXT_separate_stencil_usage allows separate depth and stencil states
  • VK_AMD_display_native_hdr, better HDR support for FreeSync 2 monitors without requiring AMD libraries
amd_vulkan.jpg

  • support for GPU timing data in the new timing capture view
  • a lot of GPU capture improvements
NewTimingCapturesWithGpuData2.png
  • new glint integrator for specular surfaces using multiple-scattering patch-based BRDF
  • addresses energy loss introduced from classical normal mapping
  • uses normal maps and second moments of slopes as in LEADR mapping
teaser_EGSR_2019.png

  • shows a new version of voxel-based path-tracing based graphics engine
  • provides an overview of the implementation
voxel_path_tracing.png

  • new path tracing sampler techniques
  • distributed per-pixel samples so that errors are distributed as blue noise in screen space
  • provides C++ source code
  • comparison against other methods at various sample counts
blue_noise_screen_space.png

  • the paper builds on the techniques described in the previous article
  • introduces a temporal algorithm that locally permutes the pixel sequences
  • improves error distribution for a series of frames
blue_noise_temporal.png

  • describes how to support unbounded arrays of textures in Vulkan
  • presents two techniques to solve validation errors
  • first fills unused slots with a know valid texture descriptor
  • second shows the required extensions to enable partially filled descriptor sets
vulkan.png

  • shows how to implement raytracing against a Signed Distance Field (SDF)
  • extends this to use sphere tracing
ClippedSphere.png
  • a master thesis that describes a progressively path-traced solution for indirect illumination lightmaps on the GPU
  • covers parameterizing geometry into lightmaps, improving coherence in a path tracer, reducing variance and spherical basis functions
  • presents a new way to store diffuse and specular irradiance using an Ambient Dice encoding scheme (additional post below)
master_thesis_illumination.png

  • explains how to extend the Ambient Dice basis function to store and evaluate both diffuse and specular irradiance
Sponza-Metals-Metallic-SG12NN-Crop.jpg
  • explains how branching on GPUs is commonly implemented
  • explains what divergence is, impact on performance and how to reduce it
  • GPUs use an execution mask to hide results from inactive threads
  • shows how this looks in GCN ISA and AVX512
gpu_branch_sorted.png

  • describes the surface gradient framework
  • a framework for robust processing of height maps, height volumes, and normal maps
  • explains the Preliminaries (Tangent Frame, Height Maps, and Volumes, Wrinkled Surfaces)
tbn.png

Thanks to Jon Greenberg for support of this series.


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