BenCello

I'm trying to have something like a waveform display but rendered in a 3D GL environment. I'm using a jit.buffer~ to read a buffer then a jit.gl.graph to render it.

Of course, I'm drastically downsampling (100).

However, I still get a huge number of points to graph because I'm graphing a growing buffer (from 0 to 20 minutes).

My problem is that as soon as I turn the jit.gl.graph on, my CPU jumps to more than 115% (dual core is wonderful ;o) when it was around 35% before.

I can't get why. Is it because of the huge number of points ? Is it because a CPU-expensive option of jit.gl.graph is on ? Is it simply because of the way jit.gl.graph is working ?

Does somebody already tried something like this ?

Do you have an idea for rendering a waveforme in 3D/GL without jit.gl.graph ?

I'm trying to have something like a waveform display but rendered in a 3D GL environment. I'm using a jit.buffer~ to read a buffer then a jit.gl.graph to render it.
Of course, I'm drastically downsampling (100).
However, I still get a huge number of points to graph because I'm graphing a growing buffer (from 0 to 20 minutes).

Does somebody already tried something like this ?
Do you have an idea for rendering a waveforme in 3D/GL without jit.gl.graph ?

jit-gl-graph-for-a-waveform-display

>I can't get why. Is it because of the huge number of points

i think so. Maybe you could try graphing 1000ms of the buffer at a time, as it records, and move the drawing position of the jit.gl.graph.

>I can't get why. Is it because of the huge number of points 

I thought of that but the display is supposed to give a way to browse in the whole buffer and select some interesting parts of it. Pretty much like waveform~ does but with a lot of additional info already displayed in 3D/OpenGL (mostly with jig.gl.sketch) along a timeline.

So this won't really reach what I would like to achieve...

Thanks anyway I'll keep looking for workarounds.

maybe you could try rendering to a texture (if a 2d waveform is acceptable)

Here's how I used to do it, using jitter matrices. Made to be a near-to drop-in replacement for scope~. Course, now I would do it using GL render to texture (on the todo list). But this might be helpful to somebody.

Oh, just realized that you were looking for something more like waveform~ than like scope~. Nevermind!

Maybe this will help, at least to start with. It displays a buffer~ in OpenGL (using jit.gl.mesh).

hehe ;o) I did a scope too years ago now...

But the last patch you posted is very efficient, jit.gl.mesh seems to be a very good way to explore for what I'd like to do.

hehe ;o) I did a scope too years ago now...
But the last patch you posted is very efficient, jit.gl.mesh seems to be a very good way to explore for what I'd like to do.
Thx a bunch
I'll keep you posted !

Thank you very much for the visualisation with jit.gl.mesh. I've adapted it to my system and it works perfectly !

It now takes a few CPU % to visualise the buffer on top of my timelime in jitter.

PS : I'm not posting the patch. It's not that I don't want to share it, it's just because it doesn't work alone (without the complex system around) and if I make a "standalone" version of it, I'll get a patch very close to the one already posted. So it won't add anything new !

Hi all - the jscope~ is great, has anyone had much success with attempting a jitter spectroscope...?

https://cycling74.com/forums/index.php?t=msg&goto=178200&rid=8295&S=6dafef1cab65be65f54c212404a86e6b#msg_178200

Hi all have you a method to draw playheads in the graham wakefield patch! i've tried with jit.gl.sketch with no results,

i would start with something like "jit.gl.gridshape @shape plane @transform_reset 2 @scale 0.01 1 0".

it can be animated using, e.g. the normalized position output of groove~ --> scale 0. 1. -1. 1. --> position $1 0 0

i would start with something like "jit.gl.gridshape @shape plane @transform_reset 2 @scale 0.01 1 0".
it can be animated using, e.g. the normalized position output of groove~ --> scale 0. 1. -1. 1. --> position $1 0 0


Thanks a lot, it's really what i wanted, there's just one problem, when moving the shape sometimes a glitch occurs, but i think there's no way to menage it...

Using more jit.gl.gridshape and different colors we can make multiple playheads, Awesome.

Thanks a lot, it's really what i wanted, there's just one problem, when moving the shape sometimes a glitch occurs, but i think there's no way to menage it...
Using more jit.gl.gridshape and different colors we can make multiple playheads, Awesome.


I know this may be a basic question but how do I change the colour of the visualised wave in Graham Wakefield's patch? I have been trying all the methods I can think of and find but it does not change the colour.

I get a different color for the waveform by changing the @color attribute in the jit.gl.mesh object at the bottom.

Sorry, should have specified, I meant the jscope patch. I can't seem to get the colour to change reliably. I have used jit.hue but this doesn't work very well and misses out some of the colour spectrum. Is there a more effective way of doing it?

Hi SLO,
Sorry, should have specified, I meant the jscope patch. I can't seem to get the colour to change reliably. I have used jit.hue but this doesn't work very well and misses out some of the colour spectrum. Is there a more effective way of doing it?


Ah, of course. :-) Graham's jscope~ is outputting a 2 plane matrix while for colour the jit.pwindow (or jit.window) needs 3 planes (RGB) of 4 planes (RGBA). Only one of the planes from jscope seems to have data, so I created 3 channels of it and scaled them to produce different colours. 

Hi Slo, apologies for the delay. That worked great thanks!

hey - this is nice to avoid the glitches that waveform~ seems to have when processing a buffer.

But how can I visualise only the first channel of a two channel buffer?

I am a complete novice to all things Max so I apologize in advance for the newbie nature of this post.

I recently saw Graham's oscilloscope in-action through Seth Shafer's wonderful demonstration videos of the Intellijel Shapeshifter (

 ) and was impressed by the quality of its waveform display compared to other digital oscilloscopes I've seen. I am wondering if it's possible (and somewhat easy) to translate Graham's code into a Max for Live device?

Any help, or a point in the right direction is appreciated!

I recently saw Graham's oscilloscope in-action through Seth Shafer's wonderful demonstration videos of the Intellijel Shapeshifter (https://youtu.be/jlnj4HwHMlk ) and was impressed by the quality of its waveform display compared to other digital oscilloscopes I've seen. I am wondering if it's possible (and somewhat easy) to translate Graham's code into a Max for Live device?

jit.gl.graph for a waveform display