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  PuppyRay for Dogwaffle:

Real Fresnel

PD Particles is great for quick painting, drawing and sketchingPD ArtistPD Howler also supports digital painting,  animation & video, 3D and visuall effects

  Introduction  | First Steps | Starfields as Elevation Maps | Water Attenuation and Dispersion | Summer Splash of Caustics
Bumps | Darkening with Water | Real Fresnel | New in Version 11 | Other Sightings | Playlist on Youtube  

Puppy Ray uses real Fresnel calculation to determine what to show when looking at water: the scenery below, essentially the ocean floor, as it appears refracted through the water's wavely deformations, or the world above, reflected on the water surface, such as the sky above, and the nearby islands, mountains, beaches.

Here are some examples using this feature.

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