positlabs

vec4 getLutColor(vec2 rg, float sliceNo, std::Texture2d colorLutTex, vec2 gridSize) {
  vec2 pixelSize = 1.0 / colorLutTex.size;
  vec2 scale = 1.0 / gridSize;

  float row = floor(sliceNo * scale.x);
  float col = sliceNo - row * gridSize.x; // mod(sliceNo, gridSize.x);

  vec2 colorLutCoords = (vec2(col, row) + rg) * scale;

  // offset by 0.5 pixel and fit within range [0.5px, width-0.5px]

positlabs

#! /bin/bash
# export all arproj found in sub directories. e.g. you want to export several projects in one folder

for i in */*.arproj
  do 
  echo "============================"
  /Applications/Spark\ AR\ Studio/Spark\ AR\ Studio.app/Contents/MacOS/sparkTerminalAppleMac export "$i" -d ./
  echo "============================"
done

positlabs

# Batch encode webm files in a directory
for i in *.webm;
  do
  ffmpeg -y -i $i -b:v 0 -crf 30 -pass 1 -an -f webm /dev/null
  ffmpeg -y -i $i -vf scale=640:640:force_original_aspect_ratio=decrease -b:v 0 -crf 30 -pass 2 "_${i}"
done

positlabs

const R = require('Reactive')
const Patches = require('Patches')
const Animation = require('Animation')
  
let frame = 0
const td = Animation.timeDriver({durationMilliseconds: 1, loopCount: Infinity, mirror: false})
td.onAfterIteration().subscribe(() => {
  frame ++
  Patches.inputs.setScalar('currentFrame', frame)
  Patches.inputs.setPulse('frame', R.once())

positlabs

#! /bin/bash
# This command converts audio according to the specifications listed in the Spark docs:
#  https://sparkar.facebook.com/ar-studio/learn/documentation/docs/audio
#  mono m4a, 44.1kHz sample rate, 16-bit-depth resolution
# Usage: 
#  convert-audio.sh myaudio.mp3 converted.m4a
# Notes: 
#  Always use m4a for output file type
#  Change "64k" to a higher value to improve bitrate/quality. e.g. 96k 128k 192k

positlabs

/*
  Resize plane to match screen size
*/
const Scene = require('Scene')
const camera = Scene.root.find('Camera')
const plane = Scene.root.find('plane0')
plane.width = camera.focalPlane.width
plane.height = camera.focalPlane.height

positlabs

/*
    The client lib for the generator will override some browser methods in order to 
    generate video or gifs of the page that it runs on. This guarantees that frames
    won't be dropped, and the framerate will be consistent.
    Global method overrides
        - setTimeout
        - setInterval
        - requestAnimationFrame
    Set currentTime of videos
*/

positlabs

#!/bin/bash 
# A simple script to backup an organization's GitHub repositories.

# NOTE: if you have more than 100 repositories, you'll need to step thru the list of repos 
# returned by GitHub one page at a time, as described at https://gist.github.com/darktim/5582423

GHBU_BACKUP_DIR=${GHBU_BACKUP_DIR-"github-backups"}                  # where to place the backup files
GHBU_ORG=${GHBU_ORG-"<REPLACE_ME>"}                                  # the GitHub organization whose repos will be backed up
                                                                     # (if you're backing up a user's repos instead, this should be your GitHub username)
GHBU_UNAME=${GHBU_UNAME-"<REPLACE_ME>"}                              # the username of a GitHub account (to use with the GitHub API)

positlabs

Shader "ShadowShader" {
	Properties{ 
		_Color("Main Color", Color) = (1,1,1,1) 
		_MainTex("Base (RGB)", 2D) = "white" {}	
		_Cutoff("Cutout", Range(0,1)) = 1.0
	}
	SubShader{
		Pass{
			Alphatest Greater[_Cutoff] SetTexture[_MainTex] 

positlabs

/*

	LazyPromise is a cachey promise creator that returns a function.

	It's good for lazily running things only once.

	Promise creation is deferred until the first call.

	Construct using same signature as a regular Promise (except it doesn't require `new`).