How Sub-Surface Scattering Physical Rendering is enhanced using Random Walk

Nowadays, render engines SSS shaders usually falls under either ‘fast’ or ‘physical’ modes. Fast SSS are like Unity game engine where speed in processing time matters more than getting physical accuracy, as long as the image quality is presentable. In fast mode, lightmaps are used to fake and simulate the scattering effect. On the other hand, Physical SSS rendering is computationally expensive. The rendering engine has to achieve physically-correct light photons, ray tracing, and global illumination to simulate the absorption versus scattering effect. finalRender, for example, is a physical rendering engine that combines all these with the Random Walk approach to enhance the look and calculation quality of sub surface scattering. You control the absorption of light based on its individual spectral wavelength. And then speed the whole process up with biasHybrid™ Light Cache and hybrid GPU+CPU rendering. Full article @ https://bit.ly/2sqUL19