Updating ParticleSystem alphaGraph (keys[]) during runtime

Hello again :slight_smile:

i have a request about updating a particle system during runtime. I would need to adjust the opacity during runtime to blend it in and out. I’ve attached the simple script below. The thing is: The particle system gets the value - if i console.log the adjustments, the key i change gets the right value, but the particle system dont change. Note: i’ve also included the particlesystem.rebuild() function, but that causes the particle system to stuck (it dont crash).

var ParticleOpacityController = pc.createScript('ParticleOpacityController');

// Opacity var for adjustments
ParticleOpacityController.attributes.add('opacity', {
    type: 'number',
    default: 1,
    min: 0,
    max: 1

// Initialize the script
ParticleOpacityController.prototype.initialize = function () {
    // Get the entity by name
    var snowEntity = this.app.root.findByName('Snow');
    // Check if the entity exists
    if (snowEntity) {
        // Get the particle system component directly
        this.particleSystem = snowEntity.particleSystem;

    } else {
        console.error("Entity 'Snow' not found.");

// Function to set the opacity of the particle system
ParticleOpacityController.prototype.setOpacity = function (opacity) {
    this.entity.particlesystem.alphaGraph.keys[1].value = opacity;

// Update the opacity during runtime
ParticleOpacityController.prototype.update = function () {

Has somebody an idea if its general possible in PlayCanvas to adjust the opacity during runtime in PlayCanvas? After several tries i had to post it here. Not sure if PlayCanvas may doesnt support changing ParticleSystem values during runtime.

Thanks for your help / input!

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