Mark Stock's Radiance Raytracing Page 3

Mark Stock's Radiance Raytracing Page 3

Recent Radiance raytraced images

Welcome to page 3 of Mark Stock's Radiance raytracings, the product of 4 years of interest in raytracing, and access to a great radiosity raytracer, Radiance. Here are some links:

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Here are the images: (most recent on top)

Using DEM data of Thunder Bay, Ontario as a heightfield makes these clouds form a realistic shape. The surface defines a mist volume, and provides the nice sky. The ground is simply a plane. 12 min on O2, final size 512x512, 25 KB JPG
Headlights on two trees in some fog, -me 0.01 -ma 0.9 -ms 0.1, rendered at 1536x1536. Trees models were built with Laurens Lapre's excellent lparser software. 10 hrs on O2, final size 512x512, 60 KB JPG
View of the moon, to accomplish bump- mapping with Radiance, I simply polygonized a bump-map. Yeah, its the brute-force method, I've got compute cycles to burn. 0.5 hr on O2, final size 512x512, 48 KB JPG
Shadow of a tree, created with my own Radiance-output capable version lparser, found here: lparser.c, lparser.txt. 3 hr on O2, tons of -ds, final size 512x512, 47 KB JPG
Tropical island, with a little snow and some procedural textures, also with a little atmospheric haze. 1 hr on O2, 2 amb bounces, final size 512x256, 24 KB JPG
A tropical island. The heightfield was created completely with Netpbm tools pgmramp and ppmforge, eroded with Jon Beale's er1u, converted and scaled with my own hftools programs, and rendered in Radiance. It took 1 hour on O2, final resolution is 768x512, 66KB JPG
Placing a mist object beneath the clouds creates a nice sunbeam effect. Try using -ms 50 on the command line. The clouds are 1000 units up, and I used a extinction coeff of 0.0004 and albedo of 0.99. 5 hours on O2, final resolution is 512x512, 24KB JPG
This is a test of a routine to apply depth cueing by fading pixels to the background sky color based on the distance from the viewpoint. Here are some of my notes about it: CLOUD_HINTS. 0.5 hour on O2, final res is 512x256, 58KB JPG
I finally rewrote my pipes program in C: pipes.c. It compiles on IRIX and Linux, and writes a Radiance description of a series of pipes, much like that nifty Windows GL screen saver...except this one doesn't make an animation. Damn, those penumbras take a while! 2 ambient bounces, 2.5 hrs on SGI O2, 512x512, 139KB GIF
Some modular tower, made of 16m cube frozen octree files for the modules. Precursor to a larger arcology rendering...coming. 1 ambient bounce, 1 hr on HP 715/64, 512x512, 45KB JPEG
USGS Digital Elevation Model for the Denver West area, converted to Radiance-readable gensurf heightfield by a quickie Java program. DEMs for most of the US are distributed for free by FTP. no ambient bounces, 2 min on AMD K5, 512x512, 183KB GIF
Output from a more advanced terrain program, written in Java. This one reads elevations from a .pgm file, creates the Phong-shaded terrain from a gensurf command, then adds trees per another .pgm file. The land grid is 125x125, and there are 3000 trees in the scene. 2 ambient bounces, 9 hrs on AMD K5, 1024x768, 135KB JPEG
Preliminary output from a terrain program I am writing for Radiance. It takes spline knot input from the contour lines on a topographic map, discretizes the scene, solves a Laplacian to fill in the gaps, and writes a gensurf-readable heightfield file. A helper app dumps some trees on it at the correct altitude. 39KB JPEG

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Mark J. Stock, Alumnus, Aerospace Engineering, The University of Michigan