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realshafer

Hi, I have an older patch that relies heavily on the HOA Library for ambisonic encoding and decoding. I can run the patch in Rosetta emulation mode, but long-term it's probably better to replace the code.

Asking the ambisonic experts here: what's the most promising path forward for real-time encoding & decoding? What's the closest drop-in replacement for my current HOA Library approach?

Hi, I have an older patch that relies heavily on the HOA Library for ambisonic encoding and decoding. I can run the patch in Rosetta...

hoa-library-replacement

HOA Library Replacement

Diemo Schwarz

Hi , I'm trying to work in 5K square resolution for dome projection, but sending video via David Butler's great jit.ndi.send is getting unusably slow (<20fps).  I made the table below comparing fps and CPU for different resolutions and aspects (16:9, square) for output via HDMI and via NDI.

Also, while the Max CPU usage (on an M3 Pro) is around 65% with HDMI out (independent of resolution), it rises >200% with NDI.

Here is the test patch. I'd be grateful for tips how to optimize things.

ndi send resolution test.maxhelp

Resolution : HDMI fps / NDI fps,  NDI CPU %

HD :        75 / 60                             125%
2k x 2k:    75 / 60                             160%
4K:         75 / 40                             162%
4k x 4k:    70 / 27                             196%
5K:         66 / 26                             193%
5k x 5k:    40 / 16                             200%
6K:         50 / 19                             193%
6k x 6k:    could not allocate matrix / 14      212%
8K:         31 / 13                             197%
8k x 8k:    could not allocate matrix / 9       220%

NDI slowing down framerate for >4K resolutions?

ndi-slowing-down-framerate-for-greater4k-resolutions

david reason

The result should have been 0, but it was 1.

gen-logical-operator-bug

Gen logical operator bug

pereshaped

When trying to load any file into Max, its insisting in trying locate an old drive that was connected via ethernet, though it isn't connected. I have search for references to the drive in the system user library but its not there. Cannot find anything referencing to it in Max preferences either. It spins a beachball for a good 60 seconds before showing the Osx filesharing icon error, "Cannot Find Drive blah blah blah." I have cleaned all reference to this in Osx but its stuck with Max9. Any idea how to cure this?

When trying to load any file into Max, its insisting in trying locate an old drive that was connected via ethernet, though it isn't...

annoying-max-9-insists-in-locating-a-none-existent-net-drive-on-file-load-beachball-spin-fest

Annoying: Max 9 insists in locating a none existent Net drive on file load. Beachball spin Fest.

I wrote a glsl shader that transforms images of fixed input size to an output with the same aspect ratio.  Now I need to generalize to different output sizes and aspects (square), and I am stumped.

// source image size (set in vertex program sh.passthrudim.vp)
float w = jit_in.texdim0.x;
float h = jit_in.texdim0.y;

void main(void) 
{
    // output pixel coords, shift so that (0, 0) is at center
    float x = jit_in.texcoord0[0] - w / 2;
    float y = jit_in.texcoord0[1] - h / 2;
    ...
}

https://docs.cycling74.com/userguide/jitter/jxs_file_format/

, I can get at the output pixel size using 

<param name="u_viewport" type="vec2" state="VIEWPORT" />

uniform vec2 u_viewport;
float outw = u_viewport.x;
float outh = u_viewport.y; 

but replacing w, h with outw, outh like so

float x = jit_in.texcoord0[0] - outw / 2;
float y = jit_in.texcoord0[1] - outh / 2;

shifts the image in weird ways.  There must be some unit mismatch between jit_in.texcoord0 and u_viewport which I can't figure out.

I wrote a glsl shader that transforms images of fixed input size to an output with the same aspect ratio.  Now I need to generalize to...

jitglslab-glsl-shader-with-non-matching-inout-dimensions

jit.gl.slab glsl shader with non-matching in/out dimensions

Andro

After not getting mat3 functions to work in jit.gl.pix I've decided to give making shaders in jit.gl.slab another go.

So all i want to do is this (code from the book of shaders), hello world :)

    vec2 st = gl_FragCoord.xy/u_resolution;

    gl_FragColor = vec4(st.x,st.y,0.0,1.0);

I just want to get the normalized co-ordinates (the green yellow representation)

I cannot find anywhere a clear example on how to get pixel co-ordinates and the resolution.

So I've gone through the "Your 1st shader tutorial", nothing.

I've gone through the documentation of jit.gl.slab, nothing.

Finally found the "The JXS File Format" in reference , nothing.

How hard can it be to add a part to the manual like " incoming texture size is "dim" (like in jit.gl.pix) ? or cell in codebox ?

http://oss.sgi.com/projects/ogl-sample/registry/ARB/GLSLangSpec.Full.1.10.59.pdf

doesn't even include the sampler2DRect function.....

So after getting over the initial learning curve of max and jitter (after a few years now) I am coming to the conclusion that the documentation and examples for jitter, jit.gen and jit.gl.pix are just seriously so outdated and not maintained.

In the last week I have spent more time trawling forums for basic information (thats pretty much present in most other software that works with graphics) and hitting deadends than getting actual results.

More than a few people in the jitter forums here have asked for such a long time for some clear examples with jit.gl.pix functions (in the context of jitter) , an updated manual etc etc..

I'm still using the gen manual from the beta...

I've had faster results with getting shaders to work in unity because theres crystal clear documentation. (and that was hard but all the info was there so i got it working )

I started with that a few weeks ago, but I'd rather stay in Jitter.

If i go to shadertoy I click a tab , voila, i see the declaration to get the dimensions and cell co-ordinates.

Its frustrating because a lot of these things don't work the way they normally would because they work within "max/jitter", I think it's great that things like snippets and ease of us have been introduced since max 7 but theres still so much basic info missing that I sometimes feel only the developers of cycling 74 can know how to make them work.

It was announced i think almost two years ago that matrix rotation mat2 mat3 and mat4 would come to codebox/jit/gl/pix.

Still nothing. People don't normally write their own mat3 function, its a basic part of glsl.

Cycling '74 Forum