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This makes it possible to support real time time-of-day simulations that support the multiple light scattering effect of lighting, shadowing from clouds and onto clouds, light contribution from the ground onto the bottom layer of clouds, and much more. The Volumetric Cloud system employs ray- marching and approximation to simulate cloud rendering for scalable real-time performance across many supported platforms and devices.
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The participating media that makes up clouds require complex lighting simulations that either aren't possible, or are too expensive, for real time simulation on consumer-grade hardware.
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The sections that follow explore and break down the cloud system's elements that contribute to rendering them for real-time rendering. The material-driven approach provides the most flexibility for artists and designers to create clouds that can move across the sky, of any type, and can handle different times of day. Now, the volumetric cloud system uses a three-dimensional volume texture that is ray-marched to represent cloud layers in real-time. Previously, rendering clouds in real-time for games and cinematics have primarily been achieved through static materials applied to a sky dome mesh or a similar approach. The system provides scalable, artist-defined clouds that can adapt to projects using ground views, flying, and ground to outer space transitions. The cloud system handles dynamic time-of-day setups that is complemented by the Sky Atmosphere and Sky Light using the real time capture mode. The Volumetric Cloud component is a physically-based cloud rendering system that uses a material-driven approach to give artists and designers the freedom to create any type of clouds they need for their projects. Budgeting with the Sky Light Real Time Capture Mode
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