EMAIL: gameprog@jps.net NAME: Gary R Arnold TOPIC: Imaginary Worlds COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT. TITLE: Extrasolar COUNTRY: USA WEBPAGE: RENDERER USED: Proprietary TOOLS USED: None RENDER TIME: Approx 1.5 hours HARDWARE USED: Pentium II-266 IMAGE DESCRIPTION: A young Earth-like planet orbits it's gas giant parent in a distant corner of the sky. Remnants of the birthing nebula still glow faintly in this thick star cluster, as a face-on galaxy pinwheels is the far, far distance. Inspired by the discovery of several extrasolar planets over the past few years, this image represents what one might actually find outside our solar system. Perhaps tidal or radioactive heating from the parent gas giant warms 47 Ursae Majoris enough to support water and life. Perhaps this is a planet no human will ever see, that galaxy in the background being our own Milky Way. Perhaps. We can only imagine -- perhaps our children will not. DESCRIPTION OF HOW THIS IMAGE WAS CREATED: This image was rendered with proprietary software I'm currently devloping. I wanted to write a program capable of generating very realistic looking planets of various types -- currently Earth-type, Jovian, Lunar, and Venusian. In addition, an hour-long programming project gave rise to a so-so galaxy renderer. I modified the program, which normally only renders one planet at a time, to render both planets, added the galaxy renderer to it, and wrote a quick starfield renderer also. Changes to the scene were fairly laborious -- change the rendering parameters, recompile, run, examine output, change the parameters again, recompile, and so on. Basically, I wrote a very specialized program that was made to render just this one image. I suppose I need to write a front end soon, huh? The gas giant is actually rather simple in execution -- a ringed wood-like procedural texture with some extra levels of turbulence added and gas giant-ish coloring. It looks better rendered large than it does in this image. The Earth-type procedural texture is composed of several layers of fractal and multifractal noise, turbulence, and whirlpools, and was inspired by Ken Musgrave's similar work. For this image, I used the cratering code from the Lunar renderer to add craters to an otherwise terrestrial planet. I think the effect makes it look a bit younger and more battered. The galaxy and starfield are really quick hack of simple fractal noise functions. Most of the starriness was created by sampling very high frequency noise functions, giving it the grainy "can't quite make out any stars" look that actual starfields have. This image was rendered in Linux and The GIMP was used to add the title, etc. info and to JPEG the image.