Stochastic processes is one thing. But most calculations in QFT is done using various perturbation theories (kind of like Taylor series expansion), instead of b

Stochastic processes is one thing. But most calculations in QFT is done using various perturbation theories (kind of like Taylor series expansion), instead of by using exact calculation. That could be interpreted kind of like ray tracing with finite resolution and a finite number of reflections. EDIT: Feynman diagrams serve as an attractive way to rationalize the various perturbations, but it may be that a "true" theory needs to be able to solve the (for us) unsolvable integrals directly. Especially since the perturbation theory integrals (that we can solve) diverge, and require renormalization to avoid infinities.