Foveated Rendering is a rendering technique used for optimization within VR applications. There’s two main techniques, static and dynamic Foveated rendering.
Static Foveated Rendering
Static foveated rendering, sometimes referred to as fixed foveated rendering, has a fixed foveation region that is usually in the centre of the display. It exploits the blurring, distortion and occlusion effects resulting from the lenses and internal headset geometry to reduce the rendering load in areas of the display which can never be seen in detail or in some cases seen at all.
Dynamic Foveated Rendering
Also called “eye tracked” foveated rendering. Dynamic foveated rendering depends on an eye tracking signal, and utilizes the fact of the reduced visual acuity of the peripheral vision to reduce detail which will not be noticed by the user.
Dynamic foveated rendering can have advantages over static foveated rendering as larger areas of the display can have reduced processing loads while every viewing direction should still present the maximum clarity available within the optical and physical constraints of the lenses and headset.