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A game developer adjusts cloud-light scattering to improve the sky rendering

frozenfractal.com 7 min read Editor score 6/10

The developer revisits a lookup table for light scattered through clouds and questions whether the prior rendering approach models multiple scattering. The graphics investigation may interest rendering engineers, though it is framed around a game.

What

A custom multithreaded recursive Monte Carlo ray tracer confirmed that POV-Ray did not simulate multiple scattering in clouds.

How

With multiple scattering, light emerges more uniformly, brightening cloud bottoms and smoothing lighting; the effect is less apparent in thin clouds.

Why it matters

Accurate scattering matters for believable cloud rendering, since a lookup table that omits multiple scattering produces a different lighting result.

Read on frozenfractal.com → Hacker News · 13 comments

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