What happens to light in clouds?

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Title : What happens to light in clouds?
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What happens to light in clouds?

Let's take a look at how sunlight interacts with clouds.

Photo New Scientist, photographer Mahrt Fabian
Although there is a light side and a shadow side on most clouds, most of the light enters the cloud rather than bouncing off the surface. If the cloud is thin enough or fragmentary enough, a light side and shadow side are not distinguishable.

But in a massive cloud like a thunderhead, the light that enters the cloud is scattered and dispersed within the mass of water vapor or ice crystals. After its random journey, the light eventually exits the cloud, lightening the shadow side, and somewhat softening the light side.

 Note that the white cloud is darker than the white house.
Photo Home Buyer
This subsurface scattering gives clouds a different character than an opaque white surface such as plaster or painted stucco. The cloud's light side is darker than the solid surface (because it's absorbing light), and the shadow side is lighter (because of subsurface scattering).

The value of the shadow side of the cloud is therefore a combination of internal scattering and external sources, such as the blue light of the sky or reflected light from the ground.



Simulating clouds turns out to be a computational challenge for artists using 3D digital tools. A recent research paper by Disney's team of computer engineers discusses some improvements in the rendering of light behavior within clouds.

They used machine learning techniques to speed up the process of volumetric path tracing, following the complex pathways of the light within the cloud. (link to video)

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Disney's research paper (PDF)
My book Color and Light: A Guide for the Realist Painter gets deep into this topic. The previous link takes you to Amazon, and this link takes you to the book on my website, which USA customers can get signed.
Previously: Subsurface Scattering


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