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@andreyvit
andreyvit / tmux.md
Created June 13, 2012 03:41
tmux cheatsheet

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

@floehopper
floehopper / install.md
Last active May 26, 2026 12:49
Install rtl-sdr on Raspian on Raspberry Pi 
jamesmead@floehopper.local:~$ sudo dd bs=1m if=/Users/jamesmead/Downloads/2015-02-16-raspbian-wheezy.img of=/dev/disk2

pi@raspberrypi ~ $ sudo raspi-config
# Choose option 1 to "Expand Filesystem" - Ensures that all of the SD card storage is available to the OS
# Choose Finish & reboot

pi@raspberrypi ~ $ sudo apt-get update
@mattatz
mattatz / Matrix.hlsl
Last active May 19, 2026 16:26
Matrix operations for HLSL
#ifndef __MATRIX_INCLUDED__
#define __MATRIX_INCLUDED__
#define IDENTITY_MATRIX float4x4(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1)
float4x4 inverse(float4x4 m) {
float n11 = m[0][0], n12 = m[1][0], n13 = m[2][0], n14 = m[3][0];
float n21 = m[0][1], n22 = m[1][1], n23 = m[2][1], n24 = m[3][1];
float n31 = m[0][2], n32 = m[1][2], n33 = m[2][2], n34 = m[3][2];
float n41 = m[0][3], n42 = m[1][3], n43 = m[2][3], n44 = m[3][3];
@bkaradzic
bkaradzic / orthodoxc++.md
Last active May 16, 2026 11:21
Orthodox C++

Orthodox C++

This article has been updated and is available here.

@drmpeg
drmpeg / gr-paint.md
Last active April 29, 2026 08:58
How to create high quality gr-paint images.

High Quality Spectrum Painting

A quick tutorial on how to get high quality images from gr-paint and Gqrx.

Spectrum Example

Setup

  • Use a newer version of Gqrx with Ref. level and dB range sliders.
  • Set the FFT size in Gqrx to 32768
@bgolus
bgolus / WorldNormalFromDepthTexture.shader
Last active April 28, 2026 14:38
Different methods for getting World Normal from Depth Texture, without any external script dependencies.
Shader "WorldNormalFromDepthTexture"
{
Properties {
[KeywordEnum(3 Tap, 4 Tap, Improved, Accurate)] _ReconstructionMethod ("Normal Reconstruction Method", Float) = 0
}
SubShader
{
Tags { "RenderType"="Transparent" "Queue"="Transparent" }
LOD 100
@banksean
banksean / perlin-noise-classical.js
Created February 15, 2010 10:00
two Perlin noise generators in javascript. The simplex version is about 10% faster (in Chrome at least, haven't tried other browsers)
// Ported from Stefan Gustavson's java implementation
// http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
// Read Stefan's excellent paper for details on how this code works.
//
// Sean McCullough banksean@gmail.com
/**
* You can pass in a random number generator object if you like.
* It is assumed to have a random() method.
*/
@lxe
lxe / goes16-rtlsdr.md
Last active April 6, 2026 17:29
Receive GOES-16 and GOES-17 Images with a Raspberry Pi and RTL-SDR dongle
@mattatz
mattatz / Quaternion.hlsl
Last active March 19, 2026 06:57
Quaternion structure for HLSL
#ifndef __QUATERNION_INCLUDED__
#define __QUATERNION_INCLUDED__
#define QUATERNION_IDENTITY float4(0, 0, 0, 1)
#ifndef PI
#define PI 3.14159265359f
#endif
// Quaternion multiplication
@jvcleave
jvcleave / distccd-rpi.plist
Last active November 30, 2025 15:45
mac distcc install instructions
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Label</key>
<string>distccd-rpi</string>
<key>Program</key>
<string>/Users/YOUR_USER_NAME/Scripts/launchd-distccd.sh</string>
<key>RunAtLoad</key>
<true/>