Why is atmospheric light scattering important to science?
Atmospheric light scattering is an important natural phenomenon, which arises when light interacts with the particles distributed in the media. Rendering such effects can be exploited by many applications, such as computer games, to greatly improve scene realism.
How does atmospheric light scattering work on Intel?
This enables achieving high quality rendering at interactive frame rates on Intel processor graphics. Since the technique implemented in this sample is primarily based on concepts presented in [ED10] and [CBDJ11], it is highly recommended to read these papers.
How does the scattering of light affect the scene?
Scattering effects affect the scene objects in two ways which account for phenomenon called aerial perspective (fig.1). From one hand some portion of light initially emitted from the object is out-scattered due to interactions with particles. From the other hand, some sun light is scattered towards the camera.
What kind of scattering occurs in the atmosphere?
The two most common forms of scattering in the atmosphere are Rayleigh scattering and Mie scattering. Rayleigh scattering is caused by small molecules in the air, and it scatters light more heavily at the shorter wavelengths (blue first, then green, and then red).
Why does Rayleigh scattering cause diffuse sky radiation?
Rayleigh scattering of sunlight in Earth’s atmosphere causes diffuse sky radiation, which is the reason for the blue color of the daytime and twilight sky, as well as the yellowish to reddish hue of the low Sun. Sunlight is also subject to Raman scattering, which changes the rotational state of the molecules and gives rise to polarization effects.
Why is atmospheric scattering important for computer graphics?
Generating realistic atmospheric scattering for computer graphics has always been a difficult problem, but it is very important for rendering realistic outdoor environments. The equations that describe atmospheric scattering are so complex that entire books have been dedicated to the subject.