Graphics Programming weekly - Issue 123 — March 15, 2020

Fresnel Equations, Schlick Approximation, Metals, and Dielectrics

  • the post presents the fresnel equations that are used for smooth metals and surfaces such as water
  • shows the Schlick approximations and compares them to the equations and where to retrieve the necessary parameter values

Reverse engineering the rendering of The Witcher 3, part 18 - color grading

  • Reverse engineering the color grading solution used in “The Witcher 3”
  • shows how the indexing into LUT works, including rounding mode handing
  • the solution used by the game can use up to 3 different LUTs for the same scene

Getting started with shaders: signed distance functions!

  • the article aimed at beginners presents how to use ShaderToy to get started with shader development
  • extends the example from simple colors to animated scenes
  • shows how to implement a spinning octahedron

Aliasing in computer graphics

  • the article presents an overview of aliasing in digital signal processing
  • then applies the information and shows how the same understanding applies to computer graphics
  • covering rasterization, texture and shading aliasing
  • short on time? Only read the TL;DR at the end
  • example code provided

Sprite Glow/Outline Shader Breakdown

  • the Unity tutorial shows how to create an outline effect for 2D sprites
  • implemented by storing a signed distance field in the alpha channel and using that additional information that in the pixel shader

Vulkan Best Practices: Frequently Asked Questions - Part 2

  • discusses buffer allocation, update and mapping strategies
  • descriptor pools, texture transfer synchronization, fence signaling, memory alignment, and shader variations

A Simple GPU Hash Table

  • the post discusses how to write a simple GPU Hash table implementation using CUDA
  • uses 32-bit keys and values with open addressing and linear probing

Interior SDFs

  • the article presents that combining signed distance fields of primitives using min and max operations can create incorrect SDFs
  • this is especially noticeable on the interiors of objects
  • offers 5 different ideas/solutions on how to solve the problem

Ray Tracing Essentials Part 4: The Ray Tracing Pipeline

  • part 4 of ray tracing series by Nvidia
  • this episode focuses on the RayTracing APIs in D3D and Vulkan
  • discusses the types of shaders and how they are interconnected

The Division ECHO Fx In Unity | GPUMAN

  • Video tutorial for Unity that shows how to present the Echo effect (a point-cloud based rendering overlay) from “The Division”
  • covers how to generate the data, implement the rendering, interactions with the player and post-processing

Why DXR 1.1 vs 1.0?

  • overview of what is new with DXR 1.1
  • presents how to extend a depth pre-pass system for shader ray tracing using the DXR 1.1 RayQuery object

ASTC Format Overview

  • the document provides an overview of the ASTC texture compression format
  • explains how end-point color compression works
  • encoding strategies, block sizes and how the format allows the compressor to adapt the techniques for each block

Automated Performance Advice for Android Games

  • the article presents how to use new ARM tools to gather performance information (later versions will support Continues integration)
  • provides an easy to read report that can be used by non-programmers to validate the performance of the game
  • the tool allows performance budgets to be defined, will be shown in the UI
  • Automated screenshot collection when frames take longer than a specified threshold to produce

Thanks to Eric Haines for support of this series.

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