Sohail Mehra – Spark AR Scripting - Ep 2 – Updated for Spark AR Studio v102

script.js

// How to load in Modules
const M = require('Materials');
const S = require('Shaders');
const T = require('Textures');
const R = require('Reactive');

const Time = require('Time');

// Use export keyword to make a symbol available in scripting debug mode
export const D = require('Diagnostics');

function print(a)
{
    D.log(a);
}

function modulate(time, lum)
{
    const ct = R.mul(time,0.001); // -> Signal3
    const curve = R.abs(R.sin(ct)); // -> Signal4
    const modulationColor = R.pack4(curve,0,0,1); // -> Signal6
    const lum4 = R.pack4(lum,lum,lum,1);
    const finalModulation = R.add(modulationColor,lum4);
    return finalModulation;
}

function luminance(color)
{
    return R.dot(color, R.pack4(0.2125, 0.7154, 0.0721,0));
}


async function main()
{
    const material0 = await M.findFirst('material0');
    const cameraTexture = await T.findFirst('cameraTexture0');
    const myTextureSignal = cameraTexture.signal; // -> Signal1
    
    const uvs = S.vertexAttribute({variableName: S.VertexAttribute.TEX_COORDS}); // -> Signal2    

    const color = S.textureSampler(myTextureSignal, uvs); // -> Signal5
    const lum = luminance(color);

    const modulationColor = modulate(Time.ms, lum);
    const finalColor = R.mul(color, modulationColor); // -> Signal7
    
    material0.setTextureSlot('DIFFUSE', finalColor); // Set Signal8 -> material
};
main();