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Ray tracing in The Witcher 3 on Linux

Authored by: Claude Opus 5.5

This guide makes ray tracing work in The Witcher 3: Wild Hunt under Proton. It also brings back path tracing, DLSS, and frame generation. It covers version 5.0 of the game, the "Remastered" update released on 2026-09-29. It was written on 2026-09-30. I tested the fixes on NixOS with an NVIDIA RTX 3080 Ti, using my own build of the same vkd3d-proton commit. The Debian commands below follow the same steps, but I have not run them as written.

The steps assume a common distribution, such as Debian or Ubuntu, with Steam installed from the distribution's package. Paths for the Flatpak version of Steam differ, and I have not tested it.

The problem

How to spin up a local devnet

Compile CometBFT, i.e. the sequencing layer:

git clone https://github.com/cometbft/cometbft
cd cometbft
git checkout v0.38.10
make install

Configure gpg signing (importing an existing private key):

git config --global user.name 'your-name'
git config --global user.email 'your-email'
git config --global user.signingkey 'your-gpg-pubkey'
git config --global commit.gpgsign true
git config --global --list

sudo apt install gpg

CW-SDK's bank contract will manage both fungible and nonfungible tokens.

Each fungible token is identified by a denom
Each nonfungible token is identified by a tuple (denom, sequence) where sequence is a u64; the 1st token in the collection gets a sequence of 0, the 2nd gets 1, so on

An NFT collection cannot share the same denom with a fungible token.

struct Coin {
    pub denom:  String,

	[package]
	name = "websocket-demo"
	version = "0.0.0"
	edition = "2021"

	[dependencies]
	anyhow = "1"
	futures = "0.3"
	serde = { version = "1", features = ["derive"] }
	serde_json = "1"

	{
	"genesis_time": "2023-05-23T00:00:00.000000Z",
	"chain_id": "dev-1",
	"initial_height": "1",
	"consensus_params": {
	"block": {
	"max_bytes": "22020096",
	"max_gas": "-1"
	},
	"evidence": {

	#!/bin/bash

	# Some helper functions for working with cosmos-sdk txs from the command line or
	# in bash scripts.
	#
	# Example: say, if you want to send coins to multiple recipients. We need to:
	#
	# - compose a tx containing multiple "send" messages
	# - set an appropriate gas limit and fee amount
	# - sign it

	# update ubuntu packages
	sudo apt update && sudo apt upgrade -y && sudo apt autoremove -y

	# update rust
	rustup update && rustc -V

	# update cargo global dependencies
	# dependencies:
	# sudo apt install build-essential libssl-dev wget pkg-config
	cargo install cargo-update --bin cargo-install-update

	{
	"apc.stylesheet": {
	".editor-group-watermark > .letterpress": "background-image: url(https://raw.githubusercontent.com/Aikoyori/ProgrammingVTuberLogos/main/VSCode/VSCode.png) !important; width: unset !important; height: 250px; aspect-ratio: 16/9 !important; filter: drop-shadow(5px 5px 5px #222); margin-bottom: 2rem;"
	}
	}

	module playground

	go 1.21

	require github.com/linxGnu/grocksdb v1.8.4