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protofuse's video generator design…

January 22, 2012 | 3:09 pm

Hi mates,
hope you’re all right.

I’m currently designing my video generator.
The system will include many slots like: internal generation, external source (webcam for instance, streams), local playing (video files)

I’m talking about internal generation here.
I’ll use JS to create what I’ll call js video units

I tested these different ways and I wanted to know your feelings/opinions about that

- MGraphics inside JSUI then output a matrix to a jit.windows
- JS drawing on LCD then output a matrix to a jit.windows
- JS directly used to draw to a jit.windows



pid
January 22, 2012 | 5:44 pm

i do not know, because i am no jitter expert, so i would have to test your tests (!).

however, at this beginning stage i would seriously consider doing everything with jit.gl.lua instead of js (faster, more powerful), and do it heavily modularised and on the gpu (as you know of course). jit.gl.gen’s, jit.gen’s inside poly~s etc etc.

naturally i’d be very interested what you come up with. good luck.


January 22, 2012 | 6:02 pm

never used lua
it could be a nice jump to learn it a bit

I want to start very light
even 2D
I’m loving processing since … wow first versions and I’ll translate a bunch of animations made with it into JS 2D.
This is the main reason I’ll go JS, because I need a prototype quite soon.

I need to have a video chain including many sources
I need to have "little" modules in JS (or jit.gl.lua as you suggested) I can easily integrate for a particular purpose (show), remove for another one, or eventually load/kill dynamically

this lua/GL has to be considered just after the first structure I’m currently finishing (I mean, the modular stuff is already possible here and it isn’t actually too complex (and WON’T be)

talk soon, pid


January 23, 2012 | 10:29 pm

After some discussions with a couple of wise friends, I won’t go to JS to jit.lcd.

I’m almost convinced to use JSUI / MGraphics.
We can (quite) easily pop out a matrix from JSUI.

My only question: I don’t need the UI part of JSUI :p
I mean: I’d use MGraphics with JS (which is very interesting in my case: translating my bunch of processing patch to max), but the best way would be to "disable" the self-display of JSUI maybe to save cpu… no sure if it does make sense.

I’d be happy to have some nice advice from JCK :D


January 23, 2012 | 10:42 pm

FWIW, don’t overlook two things:

1. There is no JSUI required for MGraphics in ordinary JS. For example:
var mymgraphics = new MGraphics(width,height);

2. The jit.mgraphics object , which can be used from Max, Java, JS, or C.

And definitely spend some time with Darwin’s great MGraphics examples for some practical MGraphics. Essentially the same logic applies.


January 23, 2012 | 10:45 pm

(MASSIVE HUGS ; now digging & sketching ; hug to the cat too!)


January 23, 2012 | 11:40 pm

because I want to be able to use code snippets as module instantiated easily (not necessarily dynamically at all), JS seems a nice way.

JS instantiating MGraphics stuff, then popping out matrices VS JS driving jit.mgraphics, that is the question.

Joshua, would you have some examples of those two cases?

– 1st one : JS instantiating MGraphics then pop matrix out
I tried to use the Tojitter.js from Darwin’s example inside a [js ] but without success:

var mymgraphics = new MGraphics(300,240);

mymgraphics.init();
mymgraphics.relative_coords = 0;
mymgraphics.autofill = 0;

var outmatrix = new JitterMatrix(4, "char", 256, 256);
var rotation = new Array(0.0, 0.0, 0.0);

mymgraphics.redraw();

function bang()
{
	var theImage = null;
	var width = 300;
	var height = 240;

	with (mymgraphics) {
		push_group();

		set_source_rgb(120,200,210);
		ellipse(50,50,100,100);
		fill();

		identity_matrix();
		theImage = new Image(pop_group());
		image_surface_draw(theImage);
	}

	theImage.tonamedmatrix(outmatrix.name);
	outlet(0, "jit_matrix", outmatrix.name);

	gc();
}

I surely made a mistake somewhere.

– 2nd one : JS "driving" the dedicated jit.mgraphics
… still looking for a basic example.

About CPU & efficiency, are those 2 ways equals ?

Thanks again for your precious help at this point of my research.


September 20, 2012 | 11:10 am

hello,

had the same problem.
solved it. if you remove the line: "push_group();" , the script works.

kugelschreiber

var outmatrix = new JitterMatrix(4, "char", 256, 256);
var rotation = new Array(0.0, 0.0, 0.0);

mymgraphics.redraw();

function bang()
{
var theImage = null;
var width = 300;
var height = 240;

with (mymgraphics) {
//push_group();

set_source_rgb(255,0,0);
ellipse(50,50,100,100);
fill();

identity_matrix();
theImage = new Image(pop_group());
image_surface_draw(theImage);
}

theImage.tonamedmatrix(outmatrix.name);
outlet(0, "jit_matrix", outmatrix.name);

gc();
}


October 15, 2012 | 5:07 pm

I am exploring porting processing sketches to Max as well. I am glad I saw this thread.
When I run the above example, the outmatrix name is sent out the outlet, but I do not
see the outmatrix. Am I missing something?


October 15, 2012 | 9:53 pm

Ahhh got it now. Pretty cool!
Is there a way I can send a jitter matrix to my js mgraphics object?

Ultimately I would like to create my own video FX chain and be able
route the output of some video process to js/mgraphics.

Anthony


October 15, 2012 | 10:02 pm

There are some nice examples in the jitter tutorial about JS (let me know if you have problems with them)

Btw, jit.gen world is also THE way to go, if you own gen of course


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