A countercultural icon and legendary American abstract painter, the 84-year-old Heilmann is among the most influential artists of her generation, emerging out of minimalism and the Beat Generation in California, with shows at the likes of Hauser & Wirth and the New Museum. Matt Creed’s documentary “Waves, Roads, & Hallucinations” premiered at the Hamptons Film Festival and now heads for streaming platforms including AppleTV and Amazon via Tribeca Films on July 30.