Graphics Programming weekly - Issue 94 — July 21, 2019

Axis-Aligned Bounding Tetrahedra and Octahedra for Ray Tracing Bounding Volume Hierarchies

  • presents Axis-Aligned-Bounding-Tetrahedron (AABT) and Axis-Aligned-Bounding-Octahedron (AABO) as alternative approaches to axis-aligned Bounding Boxes (AABB) to build acceleration structures
  • displays the data structures in 2D and extends into 3D
  • showing results and possible proposals for more research into the topic

Anatomy of a frame in AnKi

  • frame breakdown of a single frame in the Anki engine
  • clustered deferred engine
  • discussing shadows, Screen space ambient occlusion, global illumination, Volumetric lighting/fog, reflections, tone mapping, and compositing

Wavefront Path Tracing

  • the article explains what wavefront path tracing is
  • how it enables efficient path tracing on GPUs
  • implementation provided in Lighthouse 2

Robust pipeline cache serialization

  • provides an overview of Vulkan pipeline caching
  • list of possible problems that can be encountered
  • different driver behavior and IO issues require user code validation
  • shows the system used by Roblox to validate the cache

High-Performance Graphics 2019

  • slides for the High-Performance Graphics 2019 conference are now available
  • topics include raytracing, 3D text rendering, denoising, many light techniques, shadows, VR and more

Physically Based Shading

  • A Shadertoy that shows the different components the define physically based rendering
  • with explanations and demos of the separate components

GPU-Assisted Validation

  • GPU based validation in Vulkan has been updated
  • now supports more cases, the article explains which are currently supported
  • the whitepaper provides more details

Radeon GPU Analyzer 2.2 for Direct3D®12 Compute

  • Radeon GPU Analyzer can now compile compute shaders to the target ISA without having to have the GPU installed in the host machine
  • the article explains how the shader compiler pipeline works and the different ways to express the required information

Dot products and planes

  • an article explains the dot product and how it relates to the plane equation

Dot product and its relationship to matrices

  • shows how the dot product and axis define matrices
  • dot products can be used to decompose effects onto the axis
  • 3 axis represents a 3x3 matrix

How to ray-intersect a transformed geometry, without actually transforming it: a geometric illustration

  • the article shows that with the inverse-transformation applied to a ray origin and direction
  • intersection tests can be done against the untransformed geometry

Thanks to Stephen Hill for support of this series.

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