JABOB

Did some party light­ing for Ellen’s 18th last Thurs­day night. Just a bunch of bal­loons… with a twist. (Click for enlarged)

Balloons with LED illumination

Yes, the twist is that they glow. Good times.

Not quite bright enough to pro­vide use­ful illu­mi­na­tion, but enough to be intrin­si­cally inter­est­ing & entertaining.

I was con­cerned about bat­tery life hold­ing out: I should have been con­cerned about get­ting larger-capacity bal­loons in order to achieve the buoy­ancy required. The bal­loons we had (all 11″ metal­lic) all flew ini­tially, when inflated to absolute-max capac­ity, but most of them were down within 5 hours. 14″ bal­loons prob­a­bly would’ve per­formed a lot bet­ter, but we’ll never know.

We also pol­ished off a CL tank (rated for 50 bal­loons) about two bal­loons from the end of the lot, so big­ger cir­cum­fer­ence would obvi­ously require a D tank.

Future enhance­ments: size, obvi­ously; dif­fer­ent LED hous­ing for wider light; magnetic/RFID switch­ing on LEDs (we were flick­ing them on at inflate time); and increased bright­ness to make them more effec­tive as light­ing, not just entertainment.

The direc­tion I’d ulti­mately like to take it is non-latex/heavy-duty inflat­a­bles with per­ma­nently installed LEDs + wire­less con­troller. At present it’s a tri-colour LED that auto­mat­i­cally cycles between the three sub-diodes (I sup­pose they’re three real diodes, but what­ever) that are RGB. I’d like to sep­a­rate that out into three 10k MCD diodes (for a peak 30k MCD out­put at ‘white’) and a recharge­able sup­ply… not quite sure what the best way to do that is. The inflat­able would prob­a­bly be about 15” with the lumi­naire (ide­ally) sus­pended in its cen­tre so it could be used as a non-lighter-than-air device and main­tain its effec­tive­ness as a light. Think really big beach balls.

I’m look­ing at get­ting a pre­fab Blue­tooth thing with an onboard micro­con­troller to man­age it… would also like to add a micro­phone in to make it audio-responsive with­out wire­less inter­ven­tion (because wire­less will suck lots more power, amongst other things). Blue­tooth would be utilised pri­mar­ily for fad­ing the fix­tures in and out rather than colour con­trol, though obvi­ously once one is in place it’s only a small step to intro­duce dis­creet faders for each colour channel.

All that said, I know noth­ing much about Blue­tooth. I’m look­ing at a Class 1 pre­fab board with a micro­con­troller which looks good, but is rather unchar­i­ta­bly priced at 79€ per unit, and the only pub­lished unit dis­count step is a measly 2€ at 10 units. That’d make the cost of these lit­tle mon­sters (con­troller, LEDs, power, what­ever funky kind of con­tainer I find for all of the things) at least AU$250/fixture after fund­ing devel­op­ment, which does seem like an awful lot! But if they’re recharge­able and can fly and stuff I think there’s a pos­si­bil­ity other peo­ple would buy them. On Thurs­day night a lot of peo­ple were pretty fas­ci­nated by them, even when they ended up on the floor.

Methinks I’ll try and build a cou­ple for myself before even think­ing about sell­ing them, and if that comes close to hap­pen­ing look at other wire­less options. I’m pic­tur­ing some­thing cool like walk­ing around a room with 100 of these things flown on the ceil­ing (either teth­ered together or helium filled) hold­ing a Bluetooth-capable PDA, the lights fol­low­ing you posi­tion. Processor-intensive signal-strength cal­cu­la­tions would be done on the PDA itself, which would arrange the sig­nals in a matrix and detect the near­est neigh­bour, set­ting its inten­sity (and the inten­sity of the sur­round­ing sig­nals) accord­ingly. There are other options, per­haps involv­ing W-DMX512, but that’d require a sep­a­rate micro­con­troller methinks.

Fun­nily enough, when look­ing through the wire­less DMX cat­a­logue for this year, it turns out the LD for Cirque du Soleil Delir­ium did basi­cally the exact same thing (Wire­less DMX + colour mix­ing RGB LEDs + 15” bal­loon)! Page 20 has an OEM TRX mod­ule in a 84x48mm form fac­tor, but it requires an exist­ing DMX inter­face. There’s an inte­grated device on page 15 that has a bat­tery enclosed also and sup­ports PoE, but it’s a bit big­ger (115x40x70mm) and sim­i­larly lacks the onboard micro­con­troller that the Blue­tooth device has.

The W-DMX might be bet­ter on power con­sump­tion, though, on account of the pos­si­bil­ity of receive-only mode that Blue­tooth lacks (though, of course, you can dis­able vis­i­bil­ity on Blue­tooth devices, which might assist). Both tech­nolo­gies use 2.4GHz spec­trum, which is pretty much all fun and unli­censed games.

Pos­si­bly more to come on this front if I can track down a suit­able con­tainer. I can shop for geek gear fairly effec­tively, but over­sized pieces of latex are a bit less my thing.

Com­ments re: ideas, criticism, etc., all quite welcome!

Pirate Lamp

It’s funky. Nin­jas would still kick its rusty marine butt, though. (That said, I’m a pirate til late Fri­day evening)

Rusty candle box holder thing

# by Josh on August 23rd, 2007 | No Comments »

BYO vision mixer

Gephex is bril­liant. Prob­a­bly a great way to build a really capa­ble vision mixer (with some good real-time cap­ture hard­ware) on a shoe­string bud­get. I’m sick of drop­ping $120 and trekking over to Artar­mon every time a few sources need to be strung together! Actu­ally, if it weren’t for the fact that hire was locked in for an immi­nent evening, I’d prob­a­bly have can­celled and spent my $120 on another cap­ture card, instead. It’s nearly 10 frames behind real­time but that’s on a reg­u­lar Win­dows box run­ning as an un-prioritised process… on a ded­i­cated *nix machine I reckon that would drop back to about 4 frames, which is totally a fair deal (you nor­mally lose ~2 to genlocking/keyers any­way, and more if there’s a chain of mix­ers involved). Oh, yeah, and it does myr­iad effects and key­ing, too. Need to fig­ure out how to link net­work streams in, but its pretty much per­fect already. This is totally tak­ing prece­dence as my spare-time hard­ware project — it’s just call­ing for some proper gear to be built. Time to buy that book on micro­con­trollers methinks.

There are other hard­ware projects I’ve got cook­ing, yes, but none so imme­di­ately use­ful or eas­ily imple­mented. The great thing about this is the hard work (read:software) is essen­tially done already. At worst I’d need to hack some kind of inter­face dri­ver, but, really, it’s pretty much func­tional as is. And, because it’s already been ported to Linux and BSD, it’s really triv­ial to build a bare­bones sys­tem upon which to base it all. Pre­serv­ing key­board + mouse input is a totally nec­es­sary design para­me­ter any­way (for rea­sons of net­work stream inte­gra­tion, titling(!!), etc.) so hard­ware can be peri­od­i­cally switched on as it becomes avail­able. I’m tempted to pull apart my lan­guish­ing Athlon XP, but it feels too pow­er­ful for the task (not even kid­ding… this thing is light­ning fast) and I wouldn’t know what to do with the rest of the RAM in it. My biggest con­cern is track­ing down cap­ture hard­ware that’s Linux or BSD friendly. Ide­ally there’ll be a secu­rity cap­ture card that does PAL at full frame rate and has 4 inputs, because essen­tially that means it’d be triv­ial to add a few extra cards and, all of a sud­den, it’s quite fore­see­able to have a 12 input vision mixer that will key and title away til the cows come home.

One con­cern I have is that the mixer com­po­nent only takes two sources… which is much the same as on any hard­ware mix­ers I’ve used (two buses: select source on A + B bus, mix buses), but it feels really inflex­i­ble. I’d chain them together but think that might neces­si­tate extra gen­lock­ing time and increase over­all latency. I can’t actu­ally think of a usage sce­nario for this one, though, so it’s not a big deal. Because key­ing exists inde­pen­dently of mix­ing it’s not a con­cern of 2 sources + keyed source, and that’d be the main sit­u­a­tion in which such a thing would be at all necessary.

The other cool thing about this is you can mix dig­i­tal and ana­logue sources with impunity. Need SDI? Sure, get an SDI cap­ture card and add an input source. Firewire? Done deal. Same goes for out­put: because you can out­put via FFMPEG, your “vision mixer” poten­tially also encodes an IP-distributable stream simul­ta­ne­ously with real­time out­put to a monitor.

This is an ines­timably cool piece of soft­ware, but the most bril­liant thing is it isn’t really any­thing new. I dis­cov­ered it because I was look­ing for EffecTV which I’d last used in a pro­duc­tion con­text over 12 months ago… Gephex uses exist­ing open-source fil­ters and pro­cess­ing solu­tions and just pro­vides an excel­lent means of chain­ing them together. You can cre­ate some excel­lent motion art­work with it, but the most excit­ing thing for me is that it enables use of cheap and dis­pos­able x86 hard­ware in place of hideously expen­sive and pro­pri­etary (read: more expen­sive, but also inex­ten­si­ble and not par­tic­u­larly flex­i­ble) solu­tions that the ‘pros’ use.

Increas­ingly I’m dis­in­ter­ested in ‘pro­fes­sion­al­ism’ about this sort of thing, because that’s way out of my price league and, to be hon­est, the most com­mon place I wish this tech­nol­ogy were applied is in church and Chris­t­ian event con­texts, where (even if there is money) no-one is inter­ested in effec­tive com­mu­ni­ca­tion through applied tech­nol­ogy. So we con­tinue to try and push for­ward with no money and a bunch of inno­v­a­tive and irrev­er­ent (to the pros) solutions.

Ulti­mately, it’s about achiev­ing excel­lence in the qual­ity and nature of the work done to share the gospel and build up the body of those who fol­low Jesus — but excel­lence can be attained with­out even a smat­ter­ing of ‘professionalism’.

That said, I’d still love to own an MX-70.

PLAY! A video game symphony

Geek­ing tonight was awe­some. Never seen so many nerds in the one place. Need to get out (to nerd gath­er­ings) more! Con­duc­tor was Arnie Roth, who was vaguely annoy­ing but pos­si­bly only on account of his American-ness and the fact that some­one gave him a micro­phone, and we all know giv­ing con­duc­tors mics is invari­ably a BadIdea™. Akira Yamaoka had some crazy part to play with an elec­tric gui­tar (they only used one mic on his amp, I was appalled!)… he was dressed quite inter­est­ingly. I sug­gested I adopt his fash­ion sense (because, invari­ably, mine is lack­ing!) and was promptly shut down by Claudia.

Video was annoy­ingly bad in the entire first half, because the vision switch­ing was rub­bish, the cam­eras were inap­pro­pri­ate for the task, and the cam­era ops had not the fog­gi­est idea how to pull focus, adjust iris, or obey cues. Alter­na­tively, the per­son call­ing the show was just really bad at let­ting peo­ple know when they were clear to start mov­ing. I’d say some­where between the two. Given there were only four live vision sources by my count (cen­tre at audio desk, cen­tre right (stage left), stage right, organ loft) it’s not exactly as though it should’ve been too com­pli­cated. The first two were house cam­eras and gen­er­ally pretty okay. The third was an XL-1 or –2, whilst the cam­era at the organ was prob­a­bly a XM or maybe a com­pact Pana­sonic cam­era. Both cam­eras 3 and 4 had seri­ous aper­ture issues. The third was often too dark (fail­ing to com­pen­sate for dim light­ing in the room), whilst the fourth was waaay too far open. Appar­ently some­one must have set it up when house lights were on and the organ was not: accord­ingly, it was absurdly bright against the other 3 cam­eras (zebra bars, anyone?).

Part of the issue also stemmed from hav­ing two dif­fer­ent classes of pro­jec­tor in use in a con­fig­u­ra­tion where the pri­mary screen (called A) is ~18x9” and two sec­on­daries (col­lec­tively, B) are per­haps half the pri­mary screen’s dimen­sions (that is, a quar­ter of its size). All three were rear-project and I’d imag­ine that pro­jec­tor A was vastly more pow­er­ful than pro­jec­tors B. Accord­ingly, cam­era 4 appeared on B with­out los­ing details, while on A the sheet music was a vast white expanse. This is why it’s impor­tant for video nerds to look out­side their lit­tle con­trol booth some­times — pre­view mon­i­tors lie.  Also, the larger screen was one of the dirt­ier fast-folds I’ve seen used, with clearly vis­i­ble lines three-by-two across it becom­ing espe­cially appar­ent in bright, high-motion segments.

Some­how video redeemed itself in the sec­ond half (maybe dif­fer­ent cam­era­men, maybe the per­son call­ing shots got a clue in inter­mis­sion, or maybe my hyper­crit­i­cal­ness sub­sided some­what), but I wasn’t left amaz­ingly impressed.

Light­ing, on the other hand… delight­ful. Eight 5kW fres­nels with Colourset scrollers gave a nice wash to the stage above and beyond what the (more) intel­li­gent fix­tures could pro­vide. I couldn’t pick the movers on the back bar, but I’d ven­ture a guess at MAC600’s for the sides. Also four per side, as with the fres­nels. Five along the back bar, though I’m quite sure they were a dif­fer­ent kind of fix­ture. Light­ing didn’t help out the cheap Canon video cam­eras, though the house cam­eras dealt with it admirably… there were a few really beau­ti­ful shots in there from those two.

Audio worked. The 6.1 (which I read about some­where but now can’t find, and for which there were puncy lit­tle speak­ers about the size of SX100’s set up in their appro­pri­ate posi­tions) was use­ful for drown­ing out the organ at one point and mak­ing per­cus­sion come from weird direc­tions, but other than that I didn’t par­tic­u­larly notice it. Which is good. Either they weren’t using it, or the sound was just swal­lowed by the room. Quite a lot of mics and those sound par­ti­tiony things (they surely have a name, but I don’t know it), which would tend to indi­cate they were being quite ambi­tious about either record­ing the con­cert or mix­ing to sur­round and didn’t want audio leak­ing between micro­phones. Hence (in part) my frus­tra­tion at the sin­gle mic on Yamaoka’s amp… redun­dancy is impor­tant where one instru­ment is that impor­tant, espe­cially in a high-traffic area like that (con­duc­tor walks around more than any­one else on stage). There’s always the pos­si­bil­ity to re-set mics in inter­mis­sion, but if either Yamaoka or the con­duc­tor were to knock it on enter­ing after the inter­mis­sion? Stuffed. It was a decent sized amp, but it’d hardly carry through­out the build­ing very well. Aside from that… well, I don’t really know what I’m talk­ing about with audio, any­way. It sounded good.

I shocked myself by remem­ber­ing large swathes of Zelda. This makes me think I must’ve had Butterfly-Effect-esque black­outs in my child­hood, but oh well. I’ve also decided I want to buy a Dream­cast, dif­fi­cult though that may prove, because I really wanted one when they first came out (on account of that whole Linux thing, Inter­net con­nec­tiv­ity, the brand’s rel­a­tive inno­cence — hey, maybe that’s why it’s gone now –, and a hand­ful of deli­cious look­ing screen­shots from games which got great reviews) and never got around to it before they stopped mak­ing them.

Kon­ami are morons. Every­one else gives their game footage gratis, quite rea­son­ably under­stand­ing that such cov­er­age is only going to boost the value of their brand, yet Kon­ami appar­ently insisted on a water­mark on some footage pro­vided. I’ve never been a fan of many of their games any­way, but that water­mark pissed me off enough that I’m exceed­ingly glad they’re mostly stuck in arcades with aging pic­ture tube con­soles, any­way. About the same decade as their mar­ket­ing saaviness.

As much as I will always whine about any­thing visual (I “enjoy” or “dis­like” reg­u­lar con­certs with­out too much analy­sis, because I can’t), it was a good night. It made me miss pro­duc­tions enor­mously (live vision espe­cially), which is funny because I think the desired effect was to make peo­ple miss video games instead. Claud had fun laugh­ing at the geeks get­ting all dressed up. We both laughed as cer­tain mem­bers of the audi­ence were baf­fled by per­for­mance con­ven­tions! All in good fun.

Wild weather at Bronte

Bronte
Bronte
Bronte
Bronte
Bronte
Bronte

# by Josh on June 20th, 2007 | 4 Comments »

Adam’s last week running Tackles

I don’t have any good wed­ding pho­tos (well, might do on the two miniDV tapes, but… you know) so noth­ing to share there. Mark and I are appre­ci­at­ing Adam even more now he’s gone gal­li­vant­ing off on a hon­ey­moon a few thou­sand kilo­me­tres from Padding­ton School. He’ll be back on and off through­out the year, which is def­i­nitely a good thing. The pho­tos above are from his farewell inside the church, dur­ing which War­wick got myself and Mark up and tried to inter­view us with­out our prior knowl­edge (or, more accu­rately, being expressly told we wouldn’t be…) and accord­ingly man­aged to make com­plete asses of our­selves. It was one of those sit­u­a­tions where you’re bal­anc­ing between answer­ing seri­ously and giv­ing fluff responses because you don’t want to get too drawn into things (on account of this not being intended as an inter­view in the first place)… I ended up allud­ing to some­thing we’re run­ning in about Sep­tem­ber, and then nei­ther of us could even remem­ber when it was… a fan­tas­tic first impression. :/

All that aside, God was pretty good to us the first week we were on our own, despite a school fête being held simul­ta­ne­ously in the rooms we nor­mally meet in! We’ve got a social com­ing up this Fri­day and the last week of term is on Sun­day (but I’m bail­ing on account of not being able to do maths and con­se­quently hav­ing said yes to a study camp that begins a lit­tle too early).

And yes, the sword did get passed on.

# by Josh on June 20th, 2007 Tags: ,
| No Comments »