WebGL Water / lightgl.js
Copyright (c) 2011 Evan Wallace

Original: https://madebyevan.com/webgl-water/
Source: https://github.com/evanw/webgl-water
Source revision: 73eda8be832b649367b25ea5690c1f0181bb56ad
Each reused source file declares release under the MIT license.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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Kling Labs adaptation, 2026:
Original GPU heightfield solver, raytraced pool, refraction, reflections,
sphere shading and caustic projection retained. New Swedish interface,
pointer controls, fixed-step scheduler, visibility handling, reset and
presets. Renderer accepts generated tile textures and lower-cost previews;
normal reconstruction and caustic division have numerical guards.

The original photographs and Flickr tile texture are NOT redistributed.
The tile material, cubemap and golf-ball material are generated procedurally
by Kling Labs. The golf-ball coating includes 352 normal-mapped dimples and
two opposed "Kling Labs" prints. The same material is sampled by the visible
sphere and the water's reflected/refracted rays. Sphere physics and water
displacement retain the original smooth-sphere approximation.
Additional Kling Labs explorations: coherent point sources with optional
opposite phase, a single-pass harmonic line source, prescribed sphere motion,
light-elevation sweep, surface cutaway, slow motion and a simulation-time
guided tour. These additions do not change the original wave-step equation.
This is an educational graphics model, not a validated CFD solver or a
calibrated radiometric simulation. The pool coordinates are dimensionless.