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.

