Brecht

I would like to ad the effect of grain/noise on an openGL scene. Is 

there a way, and if so which, to achieve this?

I would like to ad the effect of grain/noise on an openGL scene. Is  
there a way, and if so which, to achieve this?

grainnoise-on-opengl-scene

Try using some kind of noise effect to modulate the luminance of the

final opengl image by capturing it to a texture and adding noise with

a slab object. You could do this procedurally with some noise

function or otherwise by creating a short loop of noise from source

> I would like to ad the effect of grain/noise on an openGL scene. Is

> there a way, and if so which, to achieve this?

Try using some kind of noise effect to modulate the luminance of the
final opengl image by capturing it to a texture and adding noise with
a slab object.  You could do this procedurally with some noise
function or otherwise by creating a short loop of noise from source
footage or an animation program.

On 5/21/07, Brecht Debackere  wrote:
> Hello,
>
> I would like to ad the effect of grain/noise on an openGL scene. Is
> there a way, and if so which, to achieve this?
>
> regards,
>
> brecht.
>
>


Quote: Brecht wrote on Tue, 22 May 2007 00:27

----------------------------------------------------

> I would like to ad the effect of grain/noise on an openGL scene. Is 

You could try to place a plane with the noise in front of the camera and try different blend modes.

Quote: Brecht wrote on Tue, 22 May 2007 00:27
----------------------------------------------------
> Hello,
>
> I would like to ad the effect of grain/noise on an openGL scene. Is  
> there a way, and if so which, to achieve this?
>
> regards,
>
> brecht.
>
>
----------------------------------------------------

yeah, that wiuld be easier wouldn't it :] I've got my head in shader land!

> Quote: Brecht wrote on Tue, 22 May 2007 00:27

> ----------------------------------------------------

> > I would like to ad the effect of grain/noise on an openGL scene. Is

> > there a way, and if so which, to achieve this?

> You could try to place a plane with the noise in front of the camera and try different blend modes.

> Hard- and software for interactive audiovisual sampling

On 5/22/07, Mattijs Kneppers  wrote:
>
> Quote: Brecht wrote on Tue, 22 May 2007 00:27
> ----------------------------------------------------
> > Hello,
> >
> > I would like to ad the effect of grain/noise on an openGL scene. Is
> > there a way, and if so which, to achieve this?
> >
> > regards,
> >
> > brecht.
> >
> >
> ----------------------------------------------------
>
> You could try to place a plane with the noise in front of the camera and try different blend modes.
>
> Mattijs
> --
> SmadSteck - http://www.smadsteck.nl
> Hard- and software for interactive audiovisual sampling
>


I would rather mix it with shaders/slabs, while noise part would be 

some kind of feedback process so that 'sprinkles' would have some 

time to come to and out of existance, like (hopefully) in the example 

I would rather mix it with shaders/slabs, while noise part would be  
some kind of feedback process so that 'sprinkles' would have some  
time to come to and out of existance, like (hopefully) in the example  
pasted below.

heheh. Yeah... that's an idea as well... but I haven't been to 

shaderland yet and I've the rides are really cool,... so I'm checking 

Why didn't I think of that :-) cheers for the tips.

On 22 May 2007, at 16:44, Wesley Smith wrote:

> yeah, that wiuld be easier wouldn't it :] I've got my head in 

>> Quote: Brecht wrote on Tue, 22 May 2007 00:27

>> ----------------------------------------------------

>> > I would like to ad the effect of grain/noise on an openGL scene. Is

>> > there a way, and if so which, to achieve this?

>> You could try to place a plane with the noise in front of the 

>> Hard- and software for interactive audiovisual sampling

heheh. Yeah... that's an idea as well... but I haven't been to  
shaderland yet and I've the rides are really cool,... so I'm checking  
that out.
Why didn't I think of that :-) cheers for the tips.

> yeah, that wiuld be easier wouldn't it :] I've got my head in  
> shader land!
>
> wes
>
> On 5/22/07, Mattijs Kneppers  wrote:
>>
>> Quote: Brecht wrote on Tue, 22 May 2007 00:27
>> ----------------------------------------------------
>> > Hello,
>> >
>> > I would like to ad the effect of grain/noise on an openGL scene. Is
>> > there a way, and if so which, to achieve this?
>> >
>> > regards,
>> >
>> > brecht.
>> >
>> >
>> ----------------------------------------------------
>>
>> You could try to place a plane with the noise in front of the  
>> camera and try different blend modes.
>>
>> Mattijs
>> --
>> SmadSteck - http://www.smadsteck.nl
>> Hard- and software for interactive audiovisual sampling
>>


Here's a film noise shader I originally made as a render_mode 

plugin. It comes with a test patch so one doesn't need render_node 

It's actually two shaders: one that generates a pseudo-random frame 

of an input texture based on a frame number, and another one that 

adds it in a film-noise-like way. Midtones in film noise have more 

grain than shadows and highlights. So the shader does a luminance 

calculation to decide how much noise to add to a given pixel. This 

would be hard and slow or maybe outright impossible to do with just 

on the other hand, the shader, while very nice looking, is kind of 

slow for full-screen images and so now for live shows I use, guess 

what, a plane with noise in front of the camera which gets subtracted 

Here's a film noise shader I originally made as a render_mode  
plugin.  It comes with a test patch so one doesn't need render_node  
though.

It's actually two shaders: one that generates a pseudo-random frame  
of an input texture based on a frame number, and another one that  
adds it in a film-noise-like way.   Midtones in film noise have more  
grain than shadows and highlights.  So the shader does a luminance  
calculation to decide how much noise to add to a given pixel.  This  
would be hard and slow or maybe outright impossible to do with just  
the built-in GL blend modes.

on the other hand, the shader, while very nice looking, is kind of  
slow for full-screen images and so now for live shows I use, guess  
what, a plane with noise in front of the camera which gets subtracted  
from the scene.

On May 22, 2007, at 10:55 AM, nesa wrote:

> I would rather mix it with shaders/slabs, while noise part would be 

> some kind of feedback process so that 'sprinkles' would have some 

> time to come to and out of existance, like (hopefully) in the 

> I would rather mix it with shaders/slabs, while noise part would be  
> some kind of feedback process so that 'sprinkles' would have some  
> time to come to and out of existance, like (hopefully) in the  
> example pasted below.

Wow... I get some very funky glitchy feedback with your patch running 

alongside mine...(on my patches jit.window)

The noise looks good though. I want it a bit less harsch so I'll see 

Really wondering what's causing the feedback

> #P flonum 93 449 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 92 470 79 196617 param alpha $1;

> #P newex 50 497 280 196617 jit.gl.slab fluffy @file 

> #P flonum 266 64 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 266 109 81 196617 param width $1;

> #P flonum 73 274 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 73 296 81 196617 param width $1;

> #P newex 50 325 257 196617 jit.gl.slab fluffy @file cf.dilate.jxs 

> #P newex 50 149 174 196617 jit.gl.slab fluffy @file cf.emboss.jxs 

> #P number 149 78 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P newex 50 99 109 196617 jit.op @op > @val 253;

> #P flonum 186 357 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 185 378 74 196617 param bias $1;

> #P flonum 97 352 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P flonum 247 188 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 247 207 88 196617 param amount $1;

> #P newex 50 235 271 196617 jit.gl.slab fluffy @file co.normal.jxs 

> #P message 96 373 79 196617 param scale $1;

> #P newex 50 50 121 196617 jit.noise 1 char 320 240;

> #P newex 50 420 361 196617 jit.gl.slab fluffy @file 

> cc.scalebias.jxs @param scale 6.77 @param bias -3.61;

Wow... I get some very funky glitchy feedback with your patch running  
alongside mine...(on my patches jit.window)
The noise looks good though. I want it a bit less harsch so I'll see  
to implementing jit.slide or smth.
Really wondering what's causing the feedback

> I would rather mix it with shaders/slabs, while noise part would be  
> some kind of feedback process so that 'sprinkles' would have some  
> time to come to and out of existance, like (hopefully) in the  
> example pasted below.
>
> -nesa
>
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #N vpatcher 208 89 884 680;
> #P window setfont "Sans Serif" 9.;
> #P flonum 93 449 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window linecount 0;
> #P message 92 470 79 196617 param alpha $1;
> #P newex 50 497 280 196617 jit.gl.slab fluffy @file  
> cc.contrast.ip.jxs @param alpha 4.82;
> #P flonum 266 64 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P message 266 109 81 196617 param width $1;
> #P flonum 73 274 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P message 73 296 81 196617 param width $1;
> #P newex 50 325 257 196617 jit.gl.slab fluffy @file cf.dilate.jxs  
> @param width 0.58;
> #P window linecount 2;
> #P newex 50 149 174 196617 jit.gl.slab fluffy @file cf.emboss.jxs  
> @param width 0.17;
> #P number 149 78 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P window linecount 1;
> #P newex 50 99 109 196617 jit.op @op > @val 253;
> #P flonum 186 357 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P message 185 378 74 196617 param bias $1;
> #P flonum 97 352 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P flonum 247 188 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P message 247 207 88 196617 param amount $1;
> #P newex 50 235 271 196617 jit.gl.slab fluffy @file co.normal.jxs  
> @param amount 0.95;
> #P message 96 373 79 196617 param scale $1;
> #P newex 50 50 121 196617 jit.noise 1 char 320 240;
> #P newex 50 420 361 196617 jit.gl.slab fluffy @file  
> cc.scalebias.jxs @param scale 6.77 @param bias -3.61;
> #P inlet 50 30 15 0;
> #P outlet 50 527 15 0;
> #P connect 1 0 3 0;
> #P connect 3 0 11 0;
> #P connect 17 0 13 0;
> #P connect 11 0 13 0;
> #P connect 13 0 5 0;
> #P connect 6 0 5 0;
> #P connect 5 0 14 0;
> #P connect 15 0 14 0;
> #P connect 14 0 2 0;
> #P connect 4 0 2 0;
> #P connect 9 0 2 0;
> #P connect 20 0 19 0;
> #P connect 2 0 19 0;
> #P connect 19 0 0 0;
> #P connect 16 0 15 0;
> #P connect 21 0 20 0;
> #P connect 8 0 4 0;
> #P connect 12 0 11 1;
> #P connect 10 0 9 0;
> #P connect 7 0 6 0;
> #P connect 18 0 17 0;
> #P fasten 14 0 5 1 55 346 392 346 392 229 316 229;
> #P pop;
> #P newobj 87 145 41 196617 p puffs;
> #P user jit.fpsgui 44 261 60 196617 0;
> #P newex 87 181 251 196617 jit.gl.videoplane fluffy  
> @transform_reset 2 @layer 1;
> #P toggle 174 243 15 0;
> #P message 174 271 81 196617 doublebuffer $1;
> #P window linecount 2;
> #P message 44 298 107 196617 ; jitter glreadback fbo;
> #P flonum 91 44 35 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
> #P toggle 44 42 15 0;
> #P window linecount 1;
> #P newex 44 69 57 196617 qmetro 10;
> #P newex 44 238 94 196617 jit.gl.render fluffy;
> #P newex 174 295 258 196617 jit.window fluffy @sync 0 @doublebuffer  
> 1 @floating 1;
> #P connect 6 0 0 0;
> #P connect 4 0 2 1;
> #P connect 3 0 2 0;
> #P connect 1 0 9 0;
> #P connect 7 0 6 0;
> #P connect 10 0 8 0;
> #P connect 2 0 10 0;
> #P connect 2 0 1 0;
> #P window clipboard copycount 11;
>


Patch runs pretty smooth on MBP (25fps), with Nesa's and my patch 

On 22 May 2007, at 21:14, Randy Jones wrote:

> Here's a film noise shader I originally made as a render_mode 

> plugin. It comes with a test patch so one doesn't need render_node 

> It's actually two shaders: one that generates a pseudo-random frame 

> of an input texture based on a frame number, and another one that 

> adds it in a film-noise-like way. Midtones in film noise have 

> more grain than shadows and highlights. So the shader does a 

> luminance calculation to decide how much noise to add to a given 

> pixel. This would be hard and slow or maybe outright impossible to 

> do with just the built-in GL blend modes.

> on the other hand, the shader, while very nice looking, is kind of 

> slow for full-screen images and so now for live shows I use, guess 

> what, a plane with noise in front of the camera which gets 

Patch runs pretty smooth on MBP (25fps), with Nesa's and my patch  
running in the back...
Well.. I know what to do tonight!

>
> Hi Noise Makers,
>
> Here's a film noise shader I originally made as a render_mode  
> plugin.  It comes with a test patch so one doesn't need render_node  
> though.
>
> http://2uptech.com/zip/grain_plugin.zip
>
> It's actually two shaders: one that generates a pseudo-random frame  
> of an input texture based on a frame number, and another one that  
> adds it in a film-noise-like way.   Midtones in film noise have  
> more grain than shadows and highlights.  So the shader does a  
> luminance calculation to decide how much noise to add to a given  
> pixel.  This would be hard and slow or maybe outright impossible to  
> do with just the built-in GL blend modes.
>
> on the other hand, the shader, while very nice looking, is kind of  
> slow for full-screen images and so now for live shows I use, guess  
> what, a plane with noise in front of the camera which gets  
> subtracted from the scene.
>
> best,
> Randy
>
>


Going to have to come up with a nice custom solution myself and post 

On May 22, 2007, at 3:44 PM, Brecht Debackere wrote:

> Patch runs pretty smooth on MBP (25fps), with Nesa's and my patch 

> On 22 May 2007, at 21:14, Randy Jones wrote:

>> Here's a film noise shader I originally made as a render_mode 

>> plugin. It comes with a test patch so one doesn't need 

>> It's actually two shaders: one that generates a pseudo-random 

>> frame of an input texture based on a frame number, and another one 

>> that adds it in a film-noise-like way. Midtones in film noise 

>> have more grain than shadows and highlights. So the shader does a 

>> luminance calculation to decide how much noise to add to a given 

>> pixel. This would be hard and slow or maybe outright impossible 

>> to do with just the built-in GL blend modes.

>> on the other hand, the shader, while very nice looking, is kind of 

>> slow for full-screen images and so now for live shows I use, guess 

>> what, a plane with noise in front of the camera which gets 

Going to have to come up with a nice custom solution myself and post  
it :)

> Patch runs pretty smooth on MBP (25fps), with Nesa's and my patch  
> running in the back...
> Well.. I know what to do tonight!
>
> On 22 May 2007, at 21:14, Randy Jones wrote:
>
>>
>> Hi Noise Makers,
>>
>> Here's a film noise shader I originally made as a render_mode  
>> plugin.  It comes with a test patch so one doesn't need  
>> render_node though.
>>
>> http://2uptech.com/zip/grain_plugin.zip
>>
>> It's actually two shaders: one that generates a pseudo-random  
>> frame of an input texture based on a frame number, and another one  
>> that adds it in a film-noise-like way.   Midtones in film noise  
>> have more grain than shadows and highlights.  So the shader does a  
>> luminance calculation to decide how much noise to add to a given  
>> pixel.  This would be hard and slow or maybe outright impossible  
>> to do with just the built-in GL blend modes.
>>
>> on the other hand, the shader, while very nice looking, is kind of  
>> slow for full-screen images and so now for live shows I use, guess  
>> what, a plane with noise in front of the camera which gets  
>> subtracted from the scene.
>>
>> best,
>> Randy
>>
>>
>

> some kind of feedback process so that 'sprinkles' would have some time 

> to come to and out of existance, like (hopefully) in the example 

This looks just right, nesa! Unfortunately it doesn't work at all on my 

machine - I just get a white screen, and when I turn the doublebuffer 

on/off I get a snapshot of what the effect looks like on-screen.

Any ideas about what is going on here? It may be an overall slab problem 

I am having... I'd better try the release candidate then!

nesa skrev:
> I would rather mix it with shaders/slabs, while noise part would be 
> some kind of feedback process so that 'sprinkles' would have some time 
> to come to and out of existance, like (hopefully) in the example 
> pasted below.
>
> -nesa
This looks just right, nesa! Unfortunately it doesn't work at all on my 
machine - I just get a white screen, and when I turn the doublebuffer 
on/off I get a snapshot of what the effect looks like on-screen.

Any ideas about what is going on here? It may be an overall slab problem 
I am having... I'd better try the release candidate then!

there was no erase command to the rendering context, adding one made

> > I would rather mix it with shaders/slabs, while noise part would be

> > some kind of feedback process so that 'sprinkles' would have some time

> > to come to and out of existance, like (hopefully) in the example

> This looks just right, nesa! Unfortunately it doesn't work at all on my

> machine - I just get a white screen, and when I turn the doublebuffer

> on/off I get a snapshot of what the effect looks like on-screen.

> Any ideas about what is going on here? It may be an overall slab problem

> I am having... I'd better try the release candidate then!

there was no erase command to the rendering context, adding one made
it work for me.

On 5/22/07, Andreas Wetterberg  wrote:
> nesa skrev:
> > I would rather mix it with shaders/slabs, while noise part would be
> > some kind of feedback process so that 'sprinkles' would have some time
> > to come to and out of existance, like (hopefully) in the example
> > pasted below.
> >
> > -nesa
> This looks just right, nesa! Unfortunately it doesn't work at all on my
> machine - I just get a white screen, and when I turn the doublebuffer
> on/off I get a snapshot of what the effect looks like on-screen.
>
> Any ideas about what is going on here? It may be an overall slab problem
> I am having... I'd better try the release candidate then!
>
> Andreas.
>


Super-nice patch Nesa. Very clever use of the included shaders.

Super-nice patch Nesa.  Very clever use of the included shaders.

This was every bit as cool as I thought it would be - totally not movie 

noise, but I can make it do some cool smoke emulation, hehe.

> there was no erase command to the rendering context, adding one made

>> > I would rather mix it with shaders/slabs, while noise part would be

>> > some kind of feedback process so that 'sprinkles' would have some time

>> > to come to and out of existance, like (hopefully) in the example

>> This looks just right, nesa! Unfortunately it doesn't work at all on my

>> machine - I just get a white screen, and when I turn the doublebuffer

>> on/off I get a snapshot of what the effect looks like on-screen.

>> Any ideas about what is going on here? It may be an overall slab problem

>> I am having... I'd better try the release candidate then!

Doh! Of course.
This was every bit as cool as I thought it would be - totally not movie 
noise, but I can make it do some cool smoke emulation, hehe.

yair reshef skrev:
> there was no erase command to the rendering context, adding one made
> it work for me.
>
>
> On 5/22/07, Andreas Wetterberg  wrote:
>> nesa skrev:
>> > I would rather mix it with shaders/slabs, while noise part would be
>> > some kind of feedback process so that 'sprinkles' would have some time
>> > to come to and out of existance, like (hopefully) in the example
>> > pasted below.
>> >
>> > -nesa
>> This looks just right, nesa! Unfortunately it doesn't work at all on my
>> machine - I just get a white screen, and when I turn the doublebuffer
>> on/off I get a snapshot of what the effect looks like on-screen.
>>
>> Any ideas about what is going on here? It may be an overall slab problem
>> I am having... I'd better try the release candidate then!
>>
>> Andreas.
>>
>
> .
>


I'll stuff this message with few replies:

erase shouldn't be necessary, but I've just tried this patch on XP - 

and yes - erase does fix things up. XP also seems to miss some 

parameters set as attributes for slabs(but I have to re-check this a 

bit later, and then re-check with latest jit release).

- Yep, it's not a movie noise simulation, it just demonstrates some 

aspects of the process. This is how it looks on my machine(1mb mov):

http://www.ruccas.org/pub/nesa/untitled2.mov

erase shouldn't be necessary, but I've just tried this patch on XP -  
and yes - erase does fix things up. XP also seems to miss some  
parameters set as attributes for slabs(but I have to re-check this a  
bit later, and then re-check with latest jit release).

- Yep, it's not a movie noise simulation, it just demonstrates some  
aspects of the process. This is how it looks on my machine(1mb mov):

trying to get Nesa's patch for noise working (my patch below). do I just need to plug a metro in at the top and a videoplane in at the bottom or I missing something? All I get is a white videoplane? Thanks in advance.

trying to get Nesa's patch for noise working (my patch below). do I just need to plug a metro in at the top and a videoplane in at the bottom or I missing something?  All I get is a white videoplane?  Thanks in advance.

your slabs are all referencing a context names "fluffy", but your window, videoplane and render are all named "foo".

also, you should set your window attributes to the following.

i would start over from the original patch and slowly make whatever changes you want to make, and test as you go.

your slabs are all referencing a context names "fluffy", but your window, videoplane and render are all named "foo".
also, you should set your window attributes to the following.
@sync 0 @doublebuffer 1

i would start over from the original patch and slowly make whatever changes you want to make, and test as you go.


grain/noise on openGL scene