biderman - 1 -- [29:49]
biderman - 2 -- [17:54]

brencrypto - 1 -- [124:17]
brencrypto - 2 -- [2:39]

Now with 4 XLR inputs on a breakout cable, and the stock mics wired to their own XLR plug:

Note that the stock mics should not work on anything other than a Zoom H2, since they need approx 1.9v apparently. 48v phantom power might work, but I'm not going to risk frying them...

2 Comments

I opened my Zoom H2 up, removed the 4 mics, connected the wires to a 9 pin serial connector, and put it back together...

Here it is in a picture with the original mics connected to a DB9 plug via speaker wire (it's proof of concept, hey, I know this is crappy).

I'm going to make a DB9 plug to 4x XLR breakout cable today. There is no phantom power (just a piddly 1.9v or so), so it'll have to be used with dynamic mics, but the preamps seem to work fine with the SM57 I have here. Also need to figure out where to connect the XLR's pin 1 (well, it'll go to the DB9 casing, but then on the inside the H2 will need to find a good place to ground that).

If only the (otherwise awesome) ASIO driver supported 4ch input!

1 Comment

freeform jam with dancraig

prehoof_brennewtcrypto - 1 -- [13:17]
prehoof_brennewtcrypto - 2 -- [22:11]
prehoof_brennewtcrypto - 3 -- [6:57]

brennan - 1 -- [30:02]
brennan - 2 -- [11:43]

brennewt - 1 -- [28:41]
brennewt - 2 -- [61:21]
brennewt - 3 -- [56:07]

newtbiderman - 1 -- [54:32]
newtbiderman - 2 -- [9:31]
newtbiderman - 3 -- [33:28]

bren - 1 -- [31:47]
bren - 2 -- [39:23]

So in 1996 and 1997 I wrote a 3D library called Plush. Here is a screenshot from then:

It was written in C, it tried to be very portable (reading through it now, I'd say almost to a fault -- kinda annoying ;). There were some nifty things about it:

• 256 color output with adaptive palette creation and management
• multiple light sources
• piecewise linear perspective corrected texture mapping
• Gouraud shading with color ramps that let you do fakePhong
• optional Z-buffering
• environment mapping
• object hierarchies
• frustum clipping
• cameras
• splines
• matrix functions
• primitive generation
• very basic translucency

Totally useless today. But it would run SO fast with 20x the power available...

The code itself wasn't too bad, some stuff that I had spent ages tweaking and getting to run smoothly would surely be reusable.

So in about 8 hours of work I transformed it into Plush2, which is similar to the above, except simplified in C++, renders to 32 bit per pixel output, integrates with our LICE compositing engine, and supports the following new features:

• 24 bit color output
• multiple COLORED light sources
• Texture mapping (piecewise linear perspective corrected) with optional BILINEAR filtering and support for any sized texture, support for texture transparency.
• Colored Gouraud shading
• Z-buffering
• True surface transparency support
• Multitexture support (one or both textures can be used as environment maps)
• Full control over how pixels are combined at render -- add, mulitply are supported replace, all with alpha control.
• No limits on number of light sources, triangles, etc.

A screenshot:

Yes yes I know 3D stuff has all been done a ton, just thought it was interesting bringing things back from the dead to see what would be reusable. Now I'm going to go hug my 2.4ghz multicore processor.

This will be a part of the next WDL release, in case anybody cares, ha ha. It does compile down to pretty small (though not small enough to go making a 4k demo with it)

9 Comments

freeform jam with josh

post grump

freeform jam with brennewtbider

freeform jam with schwa

So while playing with some code to model a resonating spring (F=-k*pos), I discovered that the model I was using produced a very good sine wave approximation. This isn't normally something terribly interesting, as you can approximate sine/cosines very easily, but it was actually quite low complexity -- an iterative approximation with only 2 multiplies and 3 adds per sample. It can also generate the cos() (well, a 90 degree shifted signal) for each point for just one additional multiply.

The error is pretty low for the first few cycles, though after a bit it does drift in relation to the correct wave. I'm not going to spend too much more time on this, but if anybody wants to see if there's some way to correct it, go for it (it may just be rounding error, though, of course).

Here is the code:

// setup:
double cos_sc = PI/period_samples; // PI/n for a period of n
double pos=0; // actually sin(initial_state), 1 for cos(), 0 for sin()
double vel=1/cos_sc; // actually cos(initial_state)/cos_sc, 0 for cos(),1/cos_sc for sin()
double tmp = cos_sc*cos_sc;
double tmp2 = 1.0/(1.0+tmp);
double mul1 = (1.0-tmp)*tmp2;
double mul2 = tmp*2.0*tmp2;

// per-sample calculation
double output_value=pos;
// double cosine_output = vel*cos_sc;


// iterate to next sample
double newpos = pos*mul1 + vel*mul2;
vel -= (pos+newpos);
pos = newpos;

Ta-da! If anybody wants to go and do some fancy pants math to show why this works, too, I'd love to hear it... :)

3 Comments

freeform jam with brennewtjoshdan

brenjoshdan - 1 -- [6:52]
brenjoshdan - 2 -- [54:06]
brenjoshdan - 3 -- [26:31]

freeform jam with brennewt and solo

kerosene new rough

Another tag, yay

Recordings:

kerosene

7 Comments

Time to request a hearing, as I do not have any "graffiti" but they seem to think I do....

7 Comments

brennewt - 1 -- [45:23]
brennewt - 2 -- [42:25]

The smiley face was me...

Recordings:

bren - 1 -- [23:55]
bren - 2 -- [25:42]
bren - 3 -- [32:27]

5 Comments

We'll see if this works-- both with the kids and with the city...

7 Comments

(note the car #)

8 Comments

The 3 Cs: caffeine, calories, and cocktails... Of course you need the right amount of all, and the right sequencing, but if you get that all is forgiven.

And days like this don't hurt either...

2 Comments

Found my laptop with ergonomic keyboard!

Recordings:

freeform jam with newtchr

1 Comment

Can I just say it? It's such a great tool. I know, I know, it's for web pages, you say.. But I've been using it for tasks people would use perl for, and it's great. Converting Windows .rc files into SWELL-able C++, converting at&t assembly syntax to intel syntax for Jesusonic, such great things. Hooray for PHP. Easy to install on Win32 (just unzip), comes on OS X, it's a good time. A+.

Thank you that is all.

Recordings:

freeform jam with chr

2 Comments

brenchr - 1 -- [79:16]
brenchr - 2 -- [25:26]

brenbidernewt - 1 -- [8:10]
brenbidernewt - 2 -- [104:38]
brenbidernewt - 3 -- [30:29]

freeform jam with brennewt

Still hot out, for now.. Time to shotgun a contraband Bud Lite in the bathroom...

3 Comments

bren - 1 -- [44:15]
bren - 2 -- [15:40]

Woohoo the tiny maudio ekeys 37, $49, arrived... It's small, and light.

3 Comments

demarcate

(thanks to Matt @ Open Labs)

7 Comments