Radio Radiance


Last Thursday, I hit the airwaves, yakking about lighting simulation. For some reason the Boulder Green Building Guild was interested in my take on the use of simulation in optimizing the energy efficiency of building designs in the US, on the latest installment of Footprint Radio. It was a thrill to share the half-hour with Kostas Papamichael from the California Lighting Technology Center, and my buddy Mike Plann from Lightlouver. I hope one or two people listen, and are intrigued enough to explore daylighting design, or at least turn off the lights once in a while. The cool thing is I'm now in the iTunes Music Store. Check it out by listening to the show on the BGBG's website, or…

Continue Reading

I don't get it.


Once again, I have had a humbling experience working with Radiance. Just when you think you know even a little bit about this program, you are told otherwise, simply by attempting to learn more about it. Details here: initial results with rtrace's multiprocessing feature 9QM93TAVDT59…

Continue Reading

Speedy


3421 seconds. That's how long it took my new laptop to render the de facto radiance benchmark scene. That's good enough for 13th place on the list, not bad for a laptop marketed to college kiddies and soccer moms. My old laptop is 36% slower in this test, and cost me $700 more than my new one. Amazing. Full stats: rpict user time: 3421 proc: Intel Core 2 Duo cores: 1/2 clock speed: 2.4 GHz cache: 3 MB OS: OS X 10.5.6 Radiance ver: 4.0a compiler: gcc 4.0.1 compile options: -O2 -ffast-math -funroll-loops results: 691120680 rays date: 2008-12-29 submitter: robg…

Continue Reading

In the Company of Giants


I think that when you appear in the release notes for this software, you are officially a geek. Scroll down a ways, through all kinds of compu-lighting-geekery, and you will discover that yours truly has added a tiny piece of functionality to a fantastically complex piece of software, software that excels at modeling the ultimate complexity, light. While I realize that in comparison to all the work done by Greg Ward and several other giants in the Radiance community, my contribution—comprised of nothing more than a little copying and pasting from a shell script, I might add—amounts to the equivalent of a key grip credit on a Hollywood feature, I’m still pretty happy to…

Continue Reading

ltview: a Radiance utility


Update/note: This utility has been through a few changes. It currently exists as a Perl script written by Axel Jacobs, and is part of the Radiance source code. Get some! /rpg, April 18, 2014 Radiance User: “Boy, that objview script sure is handy for looking at scene geometry; if only there was something like that for looking at the distribution of my light source files.” Announcer: “Well, THE WAIT IS OVER!! That’s right, now there’s a script that has the ease of use of objview, but is scientifically engineered for use with Radiance light source input files! Plus, if you call now, we'll include K-Tel’s “70’s platinum…

Continue Reading

Trans flowchart


<p>Hi. Miss me? So, for the last week or so I have been struggling to understand some screwy results I&#8217;ve been getting with <a href="http://floyd.lbl.gov/radiance/">Radiance</a>, using the trans material to emulate some sun control shades. After a <a href="http://www.radiance-online.org/pipermail/radiance-general/2003-May/000732.html">flurry of emails</a> today from the very talented membership of the <a href="http://www.radiance-online.org/">radiance-online.org mailing list</a>, I think I have been shown the light. Specifically, I wanted to post a link to this <a href="http://www.schorsch.com/…

Continue Reading

Rendering falsecolor on glass with vwrays


vwrays -x XRES -y YRES -vf viewfile -fd | rtrace -h -fd -opn octree \ | rtrace -fdc -I renderoptions -x XRES -y YRES octree > illumpicture.pic The first rtrace computes the intersection point (which is fast) and the second rtrace does the illuminance calculation. Cool, yes? Yes.…

Continue Reading