What are the rendering methods in games?

Question

3D rendering

Please write what are the known methods of rendering frames in games.
Something like Ray-casting and Ray-marching.

Answer 1

here

• Rasterization (English rasterization) together with the method of scanning lines (Scanline rendering (English)). Rendering is performed by projecting scene objects onto the screen without considering the effect of perspective relative to the observer.
  
• Ray casting (ray casting) (English ray casting). The scene is considered as being observed from a certain point. Rays are directed from the observation point to the objects of the scene, with the help of which the color of a pixel on a two-dimensional screen is determined. In this case, the rays stop their propagation (unlike the back tracing method) when they reach any object in the scene or its background. It is possible to use some very simple ways to add optical effects. The perspective effect is obtained naturally when the projected rays are launched at an angle depending on the position of the pixel on the screen and the maximum angle of view of the camera.
  
• Ray tracing is similar to ray casting. Rays are directed from the observation point to the objects of the scene, with the help of which the color of a pixel on a two-dimensional screen is determined. But at the same time, the beam does not stop its propagation, but is divided into three component beams, each of which contributes to the color of a pixel on a two-dimensional screen: reflected, shadow and refracted. The number of such components determines the depth of tracing and affects the quality and photorealism of the image. Due to its conceptual features, the method allows obtaining very photorealistic images, however, due to the high resource intensity, the rendering process takes a significant amount of time.
  
• Path tracing uses a similar principle to ray tracing, but this method is the closest to the physical laws of light propagation. It is also the most resource intensive.