
I’ve mentioned the digital imaging pioneer Henrik Jensen before. He has produced some striking images of caustic effects, like this cognac glass…

The hard thing to capture with any digital simulation is the quality found in Nature of infinite surface variation and complex interactivity of light, which causes unexpected nuances like that array of internal highlights.

Caustics are also at play when sunlight is refracted by a gently undulating water surface. The waves act like lenses. They focus a network of dancing lines on objects below the surface—like this Dunkleosteus from Dinotopia: The World Beneath.

Note the chromatic effects on the borders of the caustics above. Keep in mind that underwater caustic effects don’t occur much deeper than 20 or 30 feet. It would look wrong to include them in a deep-sea picture.
Dr. Jensen’s website, with explanations, link.
A 3D digital scene before and after caustics, link.
5 comments:
This has caused me so much trouble over the years, like hands the complexity and risk of portraying is incredibly off putting. I'm always so blown away by how eagerly you embrace the problems of rendering the world, even looking to science for the answers.
As well as the caustic refraction you describe here you can also get caustic reflections. Think of the patterns of dancing light you get on the ceiling of a swimming pool. Another example would be the metal ring in this render. It's the same priciple at work of course but I just wanted to point out that it isn't just lens like materials that do this.
refraction, very difficult and very interesting!
Hmm, the raytracing topic is taking shape in my mind again. This guy here has been working on such hardware. Funny that I must have met him on campus way back, but of course I didn´t know how important all of this would become, or I would have talked to him.
http://www.sven-woop.de/publications.html
I guess that in a few years in the future we will have fully raytracing capable GPUs for a reasonable prize in our computers. This is really amazing.
I came home once and the house smelled faintly like smoke. I discovered that my wooden dining table had a large teardrop shape burn in it. Near that burn was my big roundish vase of flowers. I thought it possible that aliens had showed up while I was gone and sampled a piece of the table but I stopped leaving the vase in the sun just in case:)
Post a Comment