When it comes to real-time one-path-pixel global illumination, using a good algorithm is required to achieve great performances. At least temporal accumulation can subdivide noise from details but games use only light algorithms, not Monte Carlo based in order to sustain rapidity of visualization.
But with Nvidia this great achievement is finally possible,in fact Spatiotemporal Variance-Guided Filtering does this:
.. 30Hz minimal performance requirement. Looking ahead to fully dynamic real-time path tracing, we expect this to only be feasible using a small number of paths per pixel. As such, image reconstruction using low sample counts is key to bringing path tracing to real-time. When compared to prior interactive reconstruction filters, our work gives approximately 10x more temporally stable results.
Full text of Spatiotemporal Variance-Guided Filtering in the links below.
