How to make a dynamic cubemap ? (reflexion project)

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7

var texture = this.app.assets.get(5036732); //Getting the CubeMap
Gives you an asset, not a pc.Texture object. To get texture of it:

var asset = this.app.assets.get(5036732); //Getting the CubeMap
var texture = assets.resource;

var renderTarget = new pc.RenderTarget(this.app.graphicsDevice, texture, {
    face: 0
});

this.entity.camera.renderTarget = renderTarget;

But in your case, cubemap will contain multiple resources, each referring to separate face of a cubemap, which can be accessed from resources property.