Tapdancing Goats » Web development

Better billboarding in Papervision3D

Alex — Thu, 08 Nov 2007 02:42:30 +0000

The Papervision3D wiki has an example for making billboarded sprites with just three extra lines of code. Trouble is, it doesn’t really work. Anyone who’s tried it may have noticed that when the planes get too close to the camera, or if the camera rotates around it’s z-axis at all, the planes start rolling instead of staying vertical.

The problem is that the lookAt method defaults to using the world y-axis as “up” for the billboards, which isn’t usually correct. Of course we don’t really care about the world y-axis with billboards. We just want them to be vertical in the camera. Here’s some code that does it.

// calculate the camera vertical in world coordinates
var up : Number3D = new Number3D(0, 1, 0);
Matrix3D.rotateAxis(camera.transform, up);

// billboard is the plane you want to billboard.
billboard.lookAt(viewpoint, up);
billboard.roll(180);
billboard.pitch(180);

Silly Jessica Simpson Game, Pizza Hut Codes

Alex — Sun, 04 Feb 2007 19:46:57 +0000

I don’t get it, but my wife loves the celebrity gossip, so when all this stuff about Jessica Simpson started coming out I whipped up this little game to make her laugh. It’s an homage to an old Mac game I haven’t seen in years called “Slick Willie.” I’m also keeping track of Pizza Hut’s sweepstakes codes here. Have fun.

Click on “more” to play the game.

This week’s Pizza Hut code

Send the word “WIN” to 843488 with your cell phone (the kids call it “texting”) to enter to win a new car, an entertainment center, free pizza, and more prizes. Learn more.

Here’s what they’re giving away:

$30k for a car
5 entertainment centers worth $4k each
20 $400 Pizza Hut gift cards
500 $5 music download gift cards

Flash 9 in Linux

Alex — Sun, 21 Jan 2007 01:53:33 +0000

Those of you in the know already know that Adobe recently released Flash 9 for Linux. An official, honest to god, up to date version. The best part? It actually works.

I’ve had problems with Flash since I switched to Linux, because I foolishly chose the AMD64 version of Kubuntu. After messing around with a 32-bit chroot for awhile, I finally discovered Swiftfox, a version of Firefox compiled to use 32-bit libraries but optimized for, and compatible with, 64-bit systems. I could watch Flash movies again. Sound didn’t work, but who needs to hear them anyway? Oh, and since Macromedia never released Flash 8 for Linux, there were more and more SWF’s that I couldn’t watch. And it crashed the browser a lot.

Okay, so it totally sucked.

Even so, I was pretty disappointed after I upgraded to Swiftfox 2 and found that Flash stopped working. Imagine my surprise when I clicked on the missing plugin button and saw that Flash 9 was available. I knew Flash 9 for Linux was out, but I’ve never had the plugin search feature actually work correctly. Then, right before my eyes, Flash 9 installed, the page reloaded, and the SWF started playing. With sound. “Thus Spoke Zarathustra” came on the radio, the sun broke through the clouds of winter storms, and a chorus of angels heralded, or trumpeted, or whatever it is that choruses of angels do.

It’s almost as if big companies are starting to take Linux seriously.

KPAX, SLIME, and SBCL

Alex — Sun, 24 Sep 2006 03:56:19 +0000

I’ve been struggling on and off to get KPAX to work for the past few days. It turns out that the default method SLIME uses to communicate with the Lisp interpreter causes problems with the way s-sysdeps sets up the socket listening function in SBCL. The workaround is to set swank:communication-style to :fd-handler, but it has to be set before SLIME starts, so put the following form in ~/.swank.lisp

(defparameter swank:communication-style :fd-handler)

Now to get KPAX to work with mod_lisp…