Sohail Mehra – Spark AR Scripting - Ep 1 - Basics (updated for Spark AR Studio v102)

script.js

const Materials = require('Materials');
const Textures =  require('Textures');
const Shaders = require('Shaders');
const Time = require('Time');
const Reactive = require('Reactive');

// const Diagnostics = require("Diagnostics");
// const {log} = require('Diagnostics');

async function main()
{
    const myMaterial = await Materials.findFirst('material0');
    const myCameraTexture = await (await Textures.findFirst('cameraTexture0')).signal;
    
    let uvs = await Shaders.vertexAttribute({variableName: Shaders.VertexAttribute.TEX_COORDS}); // {variableName: ‘TEX_COORDS’} would work too
    
    let ct = Reactive.mul(Time.ms,0.001);
    let curve = Reactive.abs(Reactive.sin(ct));
    
    let color = await Shaders.textureSampler(myCameraTexture, uvs);
    
    let modulationColor = Reactive.pack4(curve,0,0,1);
    let finalColor = Reactive.mul(color, modulationColor);
    
    myMaterial.setTextureSlot('DIFFUSE', finalColor);
};
main();