CodeJawn

OpenTrack Head Tracking for iRacing – Sample Config & Quick Guide

Hey sim racers!

Here’s my OpenTrack head tracking setup for iRacing using just a webcam. When I started, I couldn’t find many ready-to-use configs or clear guides, so it took some trial and error to get everything feeling right. Now that my setup is super smooth, I’m sharing my config to help others get up and running quickly!

Quick Tips

• For iRacing, you want your head tracking to be very subtle. Too much movement is makes things really abrupt.
• I mainly use yaw (left/right look) and a touch of roll. The rest are turned off for a more natural feel.

jousby

#!/bin/bash

# Run outstanding system updates
echo "Updating system install..."
softwareupdate -ia --verbose
echo ""

# Install xcode cli development tools
echo "Installing xcode cli development tools..."
xcode-select --install

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD