TITLE: Auburn_Foresthill Bridge NAME: Eric Frazier EMAIL: ericf@foothill.net TOPIC: Great Engineering Achievements COPYRIGHT: I SUBMIT TO THE STANDARD RAYTRACING COMPETITION COPYRIGHT. JPGFILE: fbridge.jpg ZIPFILE: fbridge.zip RENDERER USED: Pov-ray TOOLS USED: Pov-Ray, Paint Shop Pro RENDER TIME: 20 mins, 36 sec. HARDWARE USED: Pentium 133mhz IMAGE DESCRIPTION: This birdge is one I travel over frequently. At about a half-mile long and over 700 ft from the American River, it is a very impressive structure. Especially if you walk across. DESCRIPTION OF HOW THIS IMAGE WAS CREATED: One of the things I did with with was to create two height fields that were practically identical (included in the zip file - they were tga's in the original, converted to jpg to save space). The first was made to approximate the geography of the ravine the bridge crosses. The second is a copy of the first, but with small dots of three shades in them. Each dot is place in an area on the source of the height field matching it's shade. for example, if the greyscale brightness of an area is 50, then the dot is 55 in the outer ring, 58, and 61 as you move in. This creates a cone that rises from each area by the same amount. I then made that height field green, placed it barely under (-.01) the main terrain height field, and those cones poke through, creating trees. A back door approach, perhaps, but it worked fairly well. There was a third image used for a background height field, but it was nothing special.