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Jonas Margraf

I'm trying to figure out how to use an index array to tell jit.gl.mesh which vertices of my vertex array to draw.

Could anybody share any working examples of how to go about creating such an index array?

I've been searching in the forums and beyond, but haven't been able to find any sort of patch that uses an index array or explains how to do it. Any help would be greatly appreciated!

jit-gl-mesh-index-matrix-example

First of all, I have no idea what the answer to your question is. But I'm still going to try to help.

I’m trying to figure out how to use an index array to tell jit.gl.mesh which vertices of my vertex array to draw.

jit.gl.mesh requires a matrix to create a geometric surface, so keep that in mind. 

If you're going to have a "normal-average-everyday" 3d model/animation then you should definitely model it in something like Blender or Maya and then load the model in with jit.gl.model.

However, you might want to do something more special when creating your 3D object, you could try generating the object with jit.gl.isosurf. Take a look at Day 5 at the following link: https://cycling74.com/wiki/index.php?title=Gen_Patch-A-Day

This patch explores the use of jit.gen to generate 3D matrices for use with jit.gl.isosurf.


Thanks Rob, this is what I was looking for.

Now, I'd like to tell jit.gl.mesh to only use those coordinates in the vertex array that have z = 0. Any idea how I would go about doing that?

My first idea was to iterate over the vertex array and test for z = 0, then put those coordinates that pass into another matrix which functions as the index array. Do you think that would work? I don't have access to Max right now, so I can't try it out at the moment...

I was looking to increase performances of my mesh generation in using the indexation vertices technics. I found your patch above usefull to see how it works but for me it won't increase performances because we don't use the shared vertices.

For me the correct example for indexation vertices will be something like this 

Can you please tell me if i'm right / wrong or if it is the same or if you make something internal to the gl.mesh object to find automatically the shared vertices and ignore them? 

hi nesifao. no, there is no mechanism in gl.mesh that automatically ignores shared vertices. so yes, your example is a better demonstration of this feature.


Hey all, 
how does this actually work when a 2D matrix is used to create the shape? Is also the index array a 2D matrix? 

jit.gl.mesh index matrix example?

Felix Pastor

Can shutting down the projector connected to Mac running Max/Jitter via HDMI cause Max to freeze?

I'm trying to figure out why my Max patch stropped responding during a performance. The patch uses Mubu (not in a very computation intensive way) and Jitter (very simple: two clips - texture outputs - that are crossfaded). There are 3 audio inputs to Max, 6 channels routed to Live (Blackhole 16) and stereo pair out with a Scarlett.

I've been running this patch for the past two weeks with no issues at all during rehearsals even under stress (triggering commands like a monkey, leaving it on for a couple of hours, etc). The only difference is I wasn't using an external monitor or projector.

At the show I was projecting via HDMI and everything worked flawlessly for the sound check, dress rehearsal and even a final quick run-through of the entire program. However, during the show, at the start of my piece, the video was jumpy, slowly got worse, and eventually the entire patch stopped responding (or responded to some things and not others). The audio also got worse but Live responded. I even shut of the DSP in Max and turned it back on to see if that liberated something.

I've run through my patch looking for mistakes or memory traps or...Help please!

Max/Jitter problems after projector failure

maxjitter-problems-after-projector-failure

ygreq

Hi folks! Does anyone use OBS? Can you check if you have OBS Virtual Camera showing in jit.grab? I tested on 2 PCs and it does not work. I can see the device, but no image. 

OBS Virtual Camera is not showing in jit.grab

obs-virtual-camera-is-not-showing-in-jitgrab

Ed Selby

I got an issue when capturing UHD video via a Blackmagic PCIe card using the device

The captured image is fine when using @output_texture 0 but it is half the width with artifacts when using @output_texture 1. See the screenshot attached.

Is there a solution to get the full width resolution for @output_texture 1 ?

are working in terms of texture resolution.

By the way, DeckLink Quad HDMI Recorder [Native]/ @output_texture 1 is the only setting where I am able to achieve 60fps as mentioned here:

https://cycling74.com/forums/video-capture-uhd60fps

Update: It does happen with FHD input source even worse, see attached screenshots

output_texture.png

output_texture_1920x1080.png

 Windows 10 / Max 8.1.4 GL3 

I got an issue when capturing UHD video via a Blackmagic  PCIe card using the device
- DeckLink Quad HDMI Recorder [Native]
The captured image is fine when using @output_texture 0 but it is half the width with artifacts when using  @output_texture 1. See the screenshot attached.
Is there a solution to get the full width resolution for  @output_texture 1 ?

The other Blackmagic devices
- Blackmagic WDM Capture
- Decklink Video Capture 
are working in terms of texture resolution.

By the way,  DeckLink Quad HDMI Recorder [Native]/ @output_texture 1   is the only setting where I am able to achieve 60fps as mentioned here:
https://cycling74.com/forums/video-capture-uhd60fps

 Windows 10 / Max 8.1.4 GL3 

I got an issue when capturing UHD video via a Blackmagic  PCIe card using the device
- DeckLink Quad HDMI Reco

blackmagic-native-video-capture-issue-when-using-output_texture-1

Blackmagic Native video capture issue when using @output_texture 1

Cunning Jester

I am experiencing inexplicable behaviour of gl-objects when mixing various textures as simple jit.gl.videoplanes in poly~. The jit.gl.node they all draw to captures the textures randomly and mostly not at all; most noticeably it draws a black texture as soon as the poly~-patchers are closed (which is of course their default state), the textures themselves appear black too along the way. Even other sub patchers along the cascade of further FX sometimes need to be opened to see anything further down the line. It is in fact hard to explain and sharing the patch is far from useful since it contains too many dependencies. perhaps my macMini's performance is reaching its limit although the framerate is constant and smooth. 

This behavior, however, is not linked to any [active] object in the patches nor are there any conflicting layers which overwrite the visible content. By simply closing respective sub patchers with the videoplanes the bug (?) is easily reproduced here in this setup. Any ideas? Anyone?

It is actually quite urgent for me to find a solution.

I am running the latest Max version and am on macOS Sonoma (14.2).

HELLP! jit.gl.node stops capturing when sub patchers are not visible

hellp-jitglnode-stops-capturing-when-sub-patchers-are-not-visible

Hi everyone! I'm opening this thread in case any of you have questions, doubts, suggestions, etc, related to the Vsynth Package.

Remember I'm uploading info, screenshots, videos here:

Hi everyone! I'm opening this thread in case any of you have questions, doubts, suggestions, etc, related to the Vsynth Package.
Remember I'm uploading  info, screenshots, videos here: https://www.facebook.com/vsynth74/
https://www.instagram.com/vsynth74/
https://www.patreon.com/vsynth

Cheers!

Hi everyone! I'm opening this thread in case any of you have questions, doubts, suggestions, etc, related to the Vsynth Package.
Remember...

vsynth-package

Many thanks for the vsynth package, I'm enjoying it a lot, great work. One thing I would like to see is the capability to automate effect parameters, eg on the rota object. Is this something you are considering?

Hi Paul, thanks for your words.
Taking into account we are inside Max and there are a lot of snippets out there to automate things, I won’t develop them myself (at least not for now). I’m focusing on the oscillators, cv_ins, envelopes, filters, that is, all that has to do with video synthesis. However, for the next update, I’m adding a control inlet in every module so you can externally control them in a Max-style way with whatever you want! Here is a screenshot that exemplifies this better. You can see I’m controlling parameters with Beap and Vizzie (but this can be whatever you want) by adding just one or two simple Max objects.


That's great news - being able to control vs parameters with standard Max objects will be even better. I think I had - incorrectly - assumed you were aiming for a fully self contained system. This will be much better.

v1.0 was released yesterday fellows, go grab it through the package manager! Lots of new features!


Hi . First of all thanks for this brilliant tool. I tried your beta and was loving it ! im dying to try the new version  ,but the max package manager doesnt like me today. any manual way of installing it? otherwise i will just wait
THANKS , great job!


Thanks Carlo. Yes, I uploaded the package to gumroad for those with an older version than Max 7.1. Place it under /Documents/Max 7/Packages.

Thanks a lot. Working really smooth this new update.
Thanks for all that examples !


Hey just passing by to say this is amazing, lots of thanks, having loads of fun, and it's useful to learn a bit about jit.gl.pix too :) One question about the feedback though, i'm not sure i understand when it can be connected, like what are the conditions and the logic behind it ? As i'm a noob in graphic generation and trying to use my little knowledge from audio synth to transpose it to this world.


Thanks so much for making this and sharing it with the community! I starting playing with V Synth about a week ago and I really love it! It’s so nice to have access to this process of image making without the insane price of modular hardware or their restrictions, especially fixed NTSC resolution!

I have a couple of questions that probably relate to the same issue:

1. Sometimes after building up a patch with many wave generators, I'll decide to unplug/delete one or more from either an FM path or mixer path but their feed continues to affect the generator or mixer it was previously connected to. Is this normal? I wonder if this happens because I am often copying module chains (alt-dragging) and the copied modules have overlapping named contexts by not being instantiated from the V Synth menu bar? Do VSynth modules have to be instantiated from the VSynth Menu Bar in order to function properly?

2. I've been trying to use Snapshots with my V Synth patches. I feel like Snapshots is a huge feature to be able to take advantage of within Max7, especially when compared to equipment based modular analog video synthesis, in which preset making is impossible. Many of the V Synth modules aren't natively visible by Snapshots but I have been able to make them visible by modifying controller objects within the original bpatchers.  For example, in the CLRIZER module I've ticked 'Parameter Mode Enable' to ON for the 'swatch' object within the bpatcher and now it seems to work fine with Snapshots.

The big problem I had is that the native VSynth Menu Bar will create/instantiate a bunch of new modules every time I change presets in Snapshot. Often times these modules include new R3NDER modules which then create huge conflicts with the VSynth output window, sometimes even crashing Max7 in the process. Initially I tried to fix this within the V Synth Menu Bar by disabling 'Parameter Mode Enable' for the ‘coll’ object in that bpatcher. It seemed like it had worked until I tried to create a new VSynth module from the VSynth Menu Bar and I was no longer able to instantiate new modules at all. Reactivating the 'Parameter Mode Enable' for that coll didn’t work ( I now understand why) and I had to start again by completely reinstalling the VSynth Package.

Now I think I’ve figured out how to fix the issue with the VSynth Menu Bar. In the bpatcher for all of the ‘live.menu’ objects I have changed their ‘Parameter Visibility’ to ‘Hidden’.

I guess I’ve probably solved my problem here, but perhaps I can make a feature request out of this? Could all of the VSynth modules be made compatible with Snapshots in a future update? I’d be happy to give you notes or copies of my patches that I’ve fixed for this use, if you’d like.

Thanks again for such an awesome set of tools!


Jitter Forum