Physical Sky - The Dawn of a New Era
An appointment with the sun is waiting for you!
The physically accurate skylight model in finalRender 3.5 has been completely fine-tuned and overhauled. It is the new power tool for illuminating scenes in a photo-realistic way never possible before.
Through utilizing real world measurements and formulas to describe the illumination properties of skylight and its coloring based on the time and the region of the world, a light setup can now be created that nearly matches the "real thing" outside the office. Thanks to the new CIE sky color models, it is now easier than ever to match a skylight with a real world situation.
finalRender 3.5 offers a physical sky simulation methodology that accurately represents the colors and illumination model of a real world sky environment. The light intensities created by the physical sky model are calculated in a true High Dynamic Range Image format. Color and light intensities are calculated as they would appear in reality, at a certain place and time on earth.
How does it work?
As in the real world, finalRender 3.5 takes many aspects that form the illumination and color of a sky hemisphere into consideration. Aspects such as the time of the day, the year and month, along with the exact place on earth, are considered when rendering the skylight effect. Furthermore, parameters like dust particles, ozone, and water vapor play an important role in coloring the sky.
Click on the image to see a larger rendering
The color of a light source is defined by a collection of wavelengths. Each of these configurations indicates a particular absorption curve unique to each atmospheric element. Vaporized water in the atmosphere, for example, shows strong absorption between a wavelength of 690 and 730nm.
The physical sky model uses a true wavelength-based rendering scheme. The international standard for measuring wavelength is in nano-meters (a billionth of a meter), an extremely short distance.
In the real world, all the beautiful colors we see are made from a combination of different wavelengths, radiating all around us. A red color shows a wavelength ranging from 633-690nm, green 500-555nm and blue 440-500nm.
As usual, there is no need to focus on all physical sky parameters. The instant feedback experimenting with the controls shows in real time will easily yield the desired results.