positlabs

#!/bin/bash
# Lens Studio video asset encoder. Max dimension of 1280 using H.264 / AVC / MP4
# https://lensstudio.snapchat.com/guides/2d/video/
# USAGE: ./encode-lens-studio.sh myvideo.mov
ffmpeg -i $1 \
    -vf "scale='if(gt(iw, ih), min(1280, iw-mod(iw, 16)), -16)':'ifnot(gt(iw, ih), min(1280, ih-mod(ih, 16)), -16)'" \
    -c:v libx264 \
    -crf 23 \
    -preset veryslow \
    -c:a copy \

positlabs

#!/bin/bash
for project in **/*.arproj; 
do /Applications/Spark\ AR\ Studio.app/Contents/MacOS/sparkTerminalAppleMac export $project; 
done;

positlabs

const Scene = require('Scene')
const {log} = require('Diagnostics')
const {RGBA} = require('Reactive')

;(async function () {

  const light = await Scene.root.findFirst('ambientLight0')
  log(light)

  light.color = new RGBA(1, 1, 179/255, 1)

positlabs

#!/bin/bash

# https://trac.ffmpeg.org/wiki/Encode/VP9
# Converts video file to webm using two-pass encoding
# Installation on Mac: add script to /usr/local/bin
# Usage: 
#   webm ./path/to/video.mp4
#   Outputs ./path/to/video.mp4.webm

# Max size is 720 pixels wide. Change -vf scale to adjust

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