Re: [PD] RE : Re: need help with gem and glsl feedback
Yes it helps a lot. There are colored lines appearing in background, setting the looped gemframebuffer perspec fixes it, I will try now to found out how to turn background's black pixels to transparent. Colet Patrice - Mail original - > De: "Jack" > À: pd-list@iem.at > Envoyé: Jeudi 3 Octobre 2013 12:43:36 > Objet: Re: [PD] RE : Re: need help with gem and glsl feedback > > > > Le 03/10/2013 11:23, Patrice Colet a écrit : > > > Hello, > > I'm trying to find out how to get a backbuffer for attached shader > found in the web ( http://glsl.heroku.com/e#8849.0 ), it seem I > couldn't get alpha channel in gemframebuffer's recursion, any idea? > > I just added a line at the begining and an other one at the end of > fractalFeedback.frag to change the alpha for the feedback. > I also change the texunit ID backbuffer to 0 in the patch. > You can change alpha feedback with the number box i added in the > patch. > Hope it helps. > ++ > > Jack > > > > > ___ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] RE : Re: need help with gem and glsl feedback
Le 06/10/2013 22:13, Py Fave a écrit :
> Hello , i just opened your last patch and am looking at it .
> weanwhile i reply to your points
>
> 2013/10/6 Jack :
>> Hello,
>>
>> Le 05/10/2013 22:51, Py Fave a écrit :
>>
>> in fact my problem is not solved .
>> it seems like the feedback effect happens everywhere but on the
>> surface drawn by the shader .
>>
>> According to the patch, the feedback is applied on a [square 4] (where there
>> is also the [torus 2]).
>> Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your torus
>> is inside this snapshot (as texels and not vertices).
>>
> yes ,and then there is some feedback on the texels of the square .
> but in my patch if i rotate the torus i get some feedback but not on the
> shaded part (only the silhouette of the torus . i don't know why .
> i would like everything to go in the feedback loop .
>
> in fact i try to have trails that show "geodesics" on a surface
> later i plan to replace my torus with other models .
>
>
>
>> i use a torus , in perspective wich has a shader applied .
>>
>> i tried the following workaround(archive is joined ) , but still no luck .
>> the file to open has a OPEN in name .
>>
>> It seems there is no circle4.geom, [receive13] and [nshader0]
>> objects/abstractions in your .zip.
> sorry i forgot .
>
> receive13 only is missing .
> it's part of ext13 library (and is in pd-extended iirc)
> http://puredata.info/downloads/ext13
>
> [receive13 nothing ]could be replaced by receive nShader1
> or all the shader abstraction can be replaced by the classical shader network
> with fragment shader = circle4.frag and vertex shader = circle4.vert.
> no .geom was used
>
>
>> i would like the dots to have the feedback ,
>> or dots + geometry alltogether.
>>
>> I can't see dot in your patch (or gem window), maybe they come from geometry
>> shader (which is missing) ?
>>
> i didn't use geometry shader . just fragment .
> glsl program complains in the abstraction but no harm here i think
>
>> i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too
>> but no luck because we can't choose the mixing function .
>> and i would like only white to make trails .
>> and i don't know how to keep the supporting geometry from appearing .
>> the torus should be full black with a white trail only .
>>
>> A simple possibility is to use 2 torus, a black 'on' a white. And use the
>> white for the trail ?
>>
>> An other way :
>>
>> white torus as texture
>> |__> in the feedback __> output feedback as texture
>> |__> convert white in black texel __> output black torus as texture
>>
>> Then mix (multiply) black torus with white feedback to get a black torus
>> with white trails.
>> ++
>>
>> Jack
>>
> i'll send a modified patch a bit later .
>
> Thank you so much i see some good things from the last patch you sent .
>
> it is not what i want to do but opens other directions
> and perhaps i was focusing on one method but there seems to be alternatives .
>
> i'll update this thread tomorrow .
> i have to keep some life away from computer :-)
>
> Thanks for your help
>
> Py
>
> ___
> Pd-list@iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
Hello Pierre-Yves,
This patch should work for your purpose.
If it doesn't work, you have, maybe, a problem with your configuration.
++
Jack
// Cyrille Henry 2007
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
uniform float time, alpha_back;
uniform vec2 mouse;
uniform vec2 resolution;
uniform sampler2D backbuffer;
#define PI2 6.2831853070
// definition for a scale, rotate, and color transform
// color transform is multiply (darken) only
struct Transform {
vec4 color;
vec2 center;
float scale;
float rotation;
};
vec2 applyTransform(const Transform t, vec2 v) {
v -= t.center;
float c = cos(t.rotation);
float s = sin(t.rotation);
return (vec2(
(v.x*c - v.y*s),
(v.y*c + v.x*s)) * t.scale + t.center);
}
#define SCALE 5.0
// model will be scaled such that the rectangle (-SCALE/2, -SCALE/2), (SCALE/2,
SCALE/2)
// will be centered and fit the window with square aspect ratio.
float scale = SCALE / min(resolution.y,resolution.x);
vec2 mapModelToTexture(const vec2 v) {
return (v/(resolution*scale) + 0.5);
}
vec2 mapTextureToModel(const vec2 v) {
return (v - 0.5 * resolution) * scale;
}
// apply transform, return backbuffer sample
vec4 getBackbufferTransform(const Transform t, vec2 v) {
return t.color *
texture2D(backbuffer,
mapModelToTexture(applyTransform(t, v)));
}
vec4 whiten(const vec4 color, float f) {
return (1.-f)*color + vec4(f);
}
void main( void ) {
// transform fragment coords to model coords
vec2 v = mapTextureToModel(gl_FragCoord.x
Re: [PD] RE : Re: need help with gem and glsl feedback
Test with this one.
You should get the motion blur on the torus (here from your webcam).
Ifnot, there is a broblem somewhere else...
Le 06/10/2013 22:13, Py Fave a écrit :
> Hello , i just opened your last patch and am looking at it .
> weanwhile i reply to your points
>
> 2013/10/6 Jack :
>> Hello,
>>
>> Le 05/10/2013 22:51, Py Fave a écrit :
>>
>> in fact my problem is not solved .
>> it seems like the feedback effect happens everywhere but on the
>> surface drawn by the shader .
>>
>> According to the patch, the feedback is applied on a [square 4] (where there
>> is also the [torus 2]).
>> Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your torus
>> is inside this snapshot (as texels and not vertices).
>>
> yes ,and then there is some feedback on the texels of the square .
> but in my patch if i rotate the torus i get some feedback but not on the
> shaded part (only the silhouette of the torus . i don't know why .
> i would like everything to go in the feedback loop .
It should be OK if you put the shader for the torus on the Gem chain
with [gemhead 5] and then let the feedback chains safe like in the patch
attached.
Tell me if there is a problem now.
++
Jack
>
> in fact i try to have trails that show "geodesics" on a surface
> later i plan to replace my torus with other models .
>
>
>
>> i use a torus , in perspective wich has a shader applied .
>>
>> i tried the following workaround(archive is joined ) , but still no luck .
>> the file to open has a OPEN in name .
>>
>> It seems there is no circle4.geom, [receive13] and [nshader0]
>> objects/abstractions in your .zip.
> sorry i forgot .
>
> receive13 only is missing .
> it's part of ext13 library (and is in pd-extended iirc)
> http://puredata.info/downloads/ext13
>
> [receive13 nothing ]could be replaced by receive nShader1
> or all the shader abstraction can be replaced by the classical shader network
> with fragment shader = circle4.frag and vertex shader = circle4.vert.
> no .geom was used
>
>
>> i would like the dots to have the feedback ,
>> or dots + geometry alltogether.
>>
>> I can't see dot in your patch (or gem window), maybe they come from geometry
>> shader (which is missing) ?
>>
> i didn't use geometry shader . just fragment .
> glsl program complains in the abstraction but no harm here i think
>
>> i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too
>> but no luck because we can't choose the mixing function .
>> and i would like only white to make trails .
>> and i don't know how to keep the supporting geometry from appearing .
>> the torus should be full black with a white trail only .
>>
>> A simple possibility is to use 2 torus, a black 'on' a white. And use the
>> white for the trail ?
>>
>> An other way :
>>
>> white torus as texture
>> |__> in the feedback __> output feedback as texture
>> |__> convert white in black texel __> output black torus as texture
>>
>> Then mix (multiply) black torus with white feedback to get a black torus
>> with white trails.
>> ++
>>
>> Jack
>>
> i'll send a modified patch a bit later .
>
> Thank you so much i see some good things from the last patch you sent .
>
> it is not what i want to do but opens other directions
> and perhaps i was focusing on one method but there seems to be alternatives .
>
> i'll update this thread tomorrow .
> i have to keep some life away from computer :-)
>
> Thanks for your help
>
> Py
>
> ___
> Pd-list@iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
test.pd
Description: application/puredata
// Jack/RYBN 2013
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect MyTex1, MyTex2;
void main() {
vec2 tex_coord = gl_FragCoord.st;
vec4 color = texture2DRect(MyTex1, tex_coord);
vec4 color0 = texture2DRect(MyTex2, tex_coord);
color *= 0.01;
color0 *= 0.99;
gl_FragColor = color+color0;
}
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Re: [PD] RE : Re: need help with gem and glsl feedback
Hello , i just opened your last patch and am looking at it . weanwhile i reply to your points 2013/10/6 Jack : > Hello, > > Le 05/10/2013 22:51, Py Fave a écrit : > > in fact my problem is not solved . > it seems like the feedback effect happens everywhere but on the > surface drawn by the shader . > > According to the patch, the feedback is applied on a [square 4] (where there > is also the [torus 2]). > Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your torus > is inside this snapshot (as texels and not vertices). > yes ,and then there is some feedback on the texels of the square . but in my patch if i rotate the torus i get some feedback but not on the shaded part (only the silhouette of the torus . i don't know why . i would like everything to go in the feedback loop . in fact i try to have trails that show "geodesics" on a surface later i plan to replace my torus with other models . > > i use a torus , in perspective wich has a shader applied . > > i tried the following workaround(archive is joined ) , but still no luck . > the file to open has a OPEN in name . > > It seems there is no circle4.geom, [receive13] and [nshader0] > objects/abstractions in your .zip. sorry i forgot . receive13 only is missing . it's part of ext13 library (and is in pd-extended iirc) http://puredata.info/downloads/ext13 [receive13 nothing ]could be replaced by receive nShader1 or all the shader abstraction can be replaced by the classical shader network with fragment shader = circle4.frag and vertex shader = circle4.vert. no .geom was used > > i would like the dots to have the feedback , > or dots + geometry alltogether. > > I can't see dot in your patch (or gem window), maybe they come from geometry > shader (which is missing) ? > i didn't use geometry shader . just fragment . glsl program complains in the abstraction but no harm here i think > > i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too > but no luck because we can't choose the mixing function . > and i would like only white to make trails . > and i don't know how to keep the supporting geometry from appearing . > the torus should be full black with a white trail only . > > A simple possibility is to use 2 torus, a black 'on' a white. And use the > white for the trail ? > > An other way : > > white torus as texture > |__> in the feedback __> output feedback as texture > |__> convert white in black texel __> output black torus as texture > > Then mix (multiply) black torus with white feedback to get a black torus > with white trails. > ++ > > Jack > i'll send a modified patch a bit later . Thank you so much i see some good things from the last patch you sent . it is not what i want to do but opens other directions and perhaps i was focusing on one method but there seems to be alternatives . i'll update this thread tomorrow . i have to keep some life away from computer :-) Thanks for your help Py ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] RE : Re: need help with gem and glsl feedback
Le 06/10/2013 14:41, Jack a écrit :
> Hello,
>
> Le 05/10/2013 22:51, Py Fave a écrit :
>> in fact my problem is not solved .
>> it seems like the feedback effect happens everywhere but on the
>> surface drawn by the shader .
> According to the patch, the feedback is applied on a [square 4] (where
> there is also the [torus 2]).
> Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your
> torus is inside this snapshot (as texels and not vertices).
>> i use a torus , in perspective wich has a shader applied .
>>
>> i tried the following workaround(archive is joined ) , but still no luck .
>> the file to open has a OPEN in name .
> It seems there is no circle4.geom, [receive13] and [nshader0]
> objects/abstractions in your .zip.
>> i would like the dots to have the feedback ,
>> or dots + geometry alltogether.
> I can't see dot in your patch (or gem window), maybe they come from
> geometry shader (which is missing) ?
>> i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too
>> but no luck because we can't choose the mixing function .
>> and i would like only white to make trails .
>> and i don't know how to keep the supporting geometry from appearing .
>> the torus should be full black with a white trail only .
> A simple possibility is to use 2 torus, a black 'on' a white. And use
> the white for the trail ?
Attached is an example of that method.
Hope it will help you...
++
Jack
>
> An other way :
>
> white torus as texture
> |__> in the feedback __> output feedback as texture
> |__> convert white in black texel __> output black torus as texture
>
> Then mix (multiply) black torus with white feedback to get a black
> torus with white trails.
> ++
>
> Jack
>
>
>
>> btw i'm on windows not my choice.
>> i have to share the screen with other programs wich are windows only
>>
>> any help welcome once more .
>>
>> Thanks
>>
>> Pierre-Yves
>>
>>
>> ___
>> Pd-list@iem.at mailing list
>> UNSUBSCRIBE and account-management ->
>> http://lists.puredata.info/listinfo/pd-list
>
>
> ___
> Pd-list@iem.at mailing list
> UNSUBSCRIBE and account-management ->
> http://lists.puredata.info/listinfo/pd-list
// Jack/RYBN 2013
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect MyTex1, MyTex2;
void main() {
vec2 tex_coord = gl_FragCoord.st;
vec4 color = texture2DRect(MyTex1, tex_coord);
vec4 color0 = texture2DRect(MyTex2, tex_coord);
gl_FragColor = color+color0;
gl_FragColor.a = 0.9;
}
test.pd
Description: application/puredata
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Re: [PD] RE : Re: need help with gem and glsl feedback
Hello, Le 05/10/2013 22:51, Py Fave a écrit : > in fact my problem is not solved . > it seems like the feedback effect happens everywhere but on the > surface drawn by the shader . According to the patch, the feedback is applied on a [square 4] (where there is also the [torus 2]). Then, [gemframebuffer] 'snap' the whole 'inside' [square 4]. And your torus is inside this snapshot (as texels and not vertices). > > i use a torus , in perspective wich has a shader applied . > > i tried the following workaround(archive is joined ) , but still no luck . > the file to open has a OPEN in name . It seems there is no circle4.geom, [receive13] and [nshader0] objects/abstractions in your .zip. > > i would like the dots to have the feedback , > or dots + geometry alltogether. I can't see dot in your patch (or gem window), maybe they come from geometry shader (which is missing) ? > > i tried pix_snap2tex ( using gems.feedback from pdmtl abstractions) too > but no luck because we can't choose the mixing function . > and i would like only white to make trails . > and i don't know how to keep the supporting geometry from appearing . > the torus should be full black with a white trail only . A simple possibility is to use 2 torus, a black 'on' a white. And use the white for the trail ? An other way : white torus as texture |__> in the feedback __> output feedback as texture |__> convert white in black texel __> output black torus as texture Then mix (multiply) black torus with white feedback to get a black torus with white trails. ++ Jack > > btw i'm on windows not my choice. > i have to share the screen with other programs wich are windows only > > any help welcome once more . > > Thanks > > Pierre-Yves > > > ___ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] RE : Re: need help with gem and glsl feedback
Patrice, add [alpha 1 ] to the last chain to use alpha in your / jack's patch then you can use color on background Thanks Jack and Cyrille, my patch is better now Bonne soirée to a french thread i have one more question is it better nettiquette to reply only on the list or list + individual mail ? ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] RE : Re: need help with gem and glsl feedback
Le 03/10/2013 11:23, Patrice Colet a écrit :
> Hello,
>
> I'm trying to find out how to get a backbuffer for attached shader found in
> the web (http://glsl.heroku.com/e#8849.0), it seem I couldn't get alpha
> channel in gemframebuffer's recursion, any idea?
>
> Colet Patrice
>
>
>
> ___
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> UNSUBSCRIBE and account-management ->
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Hello Patrice,
I just added a line at the begining and an other one at the end of
fractalFeedback.frag to change the alpha for the feedback.
I also change the texunit ID backbuffer to 0 in the patch.
You can change alpha feedback with the number box i added in the patch.
Hope it helps.
++
Jack
feedback.pd
Description: application/puredata
uniform float time, alpha_back;
uniform vec2 mouse;
uniform vec2 resolution;
uniform sampler2D backbuffer;
#define PI2 6.2831853070
// definition for a scale, rotate, and color transform
// color transform is multiply (darken) only
struct Transform {
vec4 color;
vec2 center;
float scale;
float rotation;
};
vec2 applyTransform(const Transform t, vec2 v) {
v -= t.center;
float c = cos(t.rotation);
float s = sin(t.rotation);
return (vec2(
(v.x*c - v.y*s),
(v.y*c + v.x*s)) * t.scale + t.center);
}
#define SCALE 5.0
// model will be scaled such that the rectangle (-SCALE/2, -SCALE/2), (SCALE/2,
SCALE/2)
// will be centered and fit the window with square aspect ratio.
float scale = SCALE / min(resolution.y,resolution.x);
vec2 mapModelToTexture(const vec2 v) {
return (v/(resolution*scale) + 0.5);
}
vec2 mapTextureToModel(const vec2 v) {
return (v - 0.5 * resolution) * scale;
}
// apply transform, return backbuffer sample
vec4 getBackbufferTransform(const Transform t, vec2 v) {
return t.color *
texture2D(backbuffer,
mapModelToTexture(applyTransform(t, v)));
}
vec4 whiten(const vec4 color, float f) {
return (1.-f)*color + vec4(f);
}
void main( void ) {
// transform fragment coords to model coords
vec2 v = mapTextureToModel(gl_FragCoord.xy);
// draw orbs
const float innerRadius = 0.01;
float outerRadius = .24 + .03 * (sin(17.*time) + sin(11.*time));
vec2 p1 = (vec2(sin(time), cos(time)));
vec2 p2 = (vec2(sin(time*1.1), cos(time*1.1)));
vec2 p3 = (vec2(sin(time*1.3), cos(time*1.3)));
float d1 = length(v -p1);
float d2 = length(v -p2);
float d3 = length(v -p3);
const float aa = 0.95;
const float bb = 0.65;
const float cc = 0.05;
const vec4 color1 = vec4(aa, bb, cc, 2.0);
const vec4 color2 = vec4(cc, bb, aa, 2.0);
const vec4 color3 = vec4(aa, cc, bb, 2.0);
vec4 drawing = vec4(0.,0.,0.,0.);
drawing += smoothstep(outerRadius, innerRadius, d1) * color1;
drawing += smoothstep(outerRadius, innerRadius, d2) * color2;
drawing += smoothstep(outerRadius, innerRadius, d3) * color3;
// draw ring/disc
float rr = length(v);
drawing += vec4(1.)
* smoothstep(1.1, 1., rr)
* smoothstep(0.9, 0.5+0.5*sin(0.1*time), rr);
// apply feedback transforms to backbuffer
// define transform structs
float r = time*.27;
Transform t1 = Transform(
whiten(vec4(aa, bb, cc, 1.0), 0.7),
vec2(-.7, 0.),
1.5,
-r*3.);
Transform t2 = Transform(
whiten(vec4(cc, bb, aa, 1.0), 0.7),
vec2(0.7, 0.),
1.5,
r*2.);
// composite feedback with drawing
vec4 fc = max( getBackbufferTransform(t1, v),
getBackbufferTransform(t2, v));
gl_FragColor = (1.-drawing[3])*fc -vec4(.01) + drawing[3]*drawing;
gl_FragColor.a = alpha_back;
}
// Cyrille Henry 2007
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
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[PD] RE : Re: need help with gem and glsl feedback
Hello,
I'm trying to find out how to get a backbuffer for attached shader found in the
web (http://glsl.heroku.com/e#8849.0), it seem I couldn't get alpha channel in
gemframebuffer's recursion, any idea?
Colet Patrice
// Cyrille Henry 2007
void main()
{
gl_TexCoord[0] = gl_MultiTexCoord0;
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}
#N canvas 923 209 901 669 10;
#X obj 76 566 glsl_program;
#X obj 149 419 pack 0 0;
#X obj 170 399 t b f;
#X obj 166 354 change;
#X obj 148 259 change;
#X msg 149 445 link \$1 \$2;
#X floatatom 170 380 2 0 0 0 ID - -;
#X floatatom 148 282 2 0 0 0 ID - -;
#X obj 167 466 print linking;
#X obj 213 222 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 76 240 glsl_vertex;
#X obj 76 334 glsl_fragment;
#X text 231 219 <- load shader;
#N canvas 87 154 247 179 Gem.init 0;
#X obj 118 46 loadbang;
#X msg 118 81 reset;
#X obj 118 113 outlet;
#X connect 0 0 1 0;
#X connect 1 0 2 0;
#X restore 551 12 pd Gem.init;
#N canvas 340 107 682 322 gemwin 0;
#X obj 102 122 tgl 15 0 \$0-gemstart \$0-gemstart empty 17 7 0 10 -262144
-1 -1 1 1;
#X obj 102 161 r \$0-gemstart;
#X obj 102 182 select 1 0;
#X msg 102 214 create \, 1;
#X msg 177 215 destroy;
#X obj 102 239 t a;
#X obj 318 54 inlet;
#X obj 318 255 gemwin;
#X obj 318 100 t a a;
#X obj 318 287 outlet;
#X obj 350 128 route create destroy;
#X obj 350 150 t b;
#X msg 350 172 1;
#X obj 390 150 t b;
#X msg 390 172 0;
#X obj 350 195 t f;
#X msg 350 219 set \$1;
#X text 118 122 rendering;
#X connect 1 0 2 0;
#X connect 2 0 3 0;
#X connect 2 1 4 0;
#X connect 3 0 5 0;
#X connect 4 0 5 0;
#X connect 5 0 8 0;
#X connect 6 0 8 0;
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#X connect 8 0 7 0;
#X connect 8 1 10 0;
#X connect 10 0 11 0;
#X connect 10 1 13 0;
#X connect 11 0 12 0;
#X connect 12 0 15 0;
#X connect 13 0 14 0;
#X connect 14 0 15 0;
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#X connect 16 0 0 0;
#X coords 0 -1 1 1 85 40 1 100 100;
#X restore 533 33 pd gemwin;
#X msg 31 357 print;
#X msg 32 279 print;
#X msg 39 547 print;
#X obj 76 168 alpha;
#X obj 74 143 t a b;
#X obj 188 162 change;
#X msg 188 142 1;
#X obj 76 589 pix_texture;
#X msg 87 219 open texture.vert;
#X obj 437 355 f;
#X obj 465 354 + 1;
#X obj 433 310 tgl 15 0 empty empty empty 17 7 0 10 -262144 -1 -1 1
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#X obj 435 333 metro 1;
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fractalFeedback
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[PD] RE : Re: need help with gem and glsl feedback
Use, format RGB32 instead of RGB for your framebufers.
++
JackPy Fave a écrit :first thanks both for your help.
i was tired yesterday evening.
jack , i have a problem with your patch.
i had already similar problems before, that's why i wanted to use some
shader in the feedback chain .
it works ok BUT with very long feedback ( 0.999 alpha ) values i get a
ghost image,
the point never diseappears( because perhaps of a bad approximation in
opengl ) .
ie : color 1 1 1 0.995
leaves traces
is that a problem with my graphics card ? i don't think so .
i join a clumsy correction test , with makes things flicker a bit too much .
do you have a better workaround?
2013/10/2 Jack :
> Le 02/10/2013 20:10, Py Fave a écrit :
>> Hello list ,
>>
>> i'm currently trying to understand a bit more glsl ,
>> and am tearing my hairs
>>
>> i have a scene with some moving geometry (torus)
>> on this geometry i use successfully a simple shader to plot a moving circle.
>>
>> Then
>> i try to make the classical feedback effect , but i need to use glsl
>> because i want to control precisely the adding of the image at time
>> and at time+1
>>
>> here is the feedback shader i try to use .
>>
>> uniform sampler2D tex1,tex2;
>> uniform float motionblurstrenght;
>> vec2 coord = gl_TexCoord[0].st;
>> void main()
>> {
>> vec4 t1 = texture(tex1, coord);//new frame
>> vec4 t2 = texture(tex2, coord);//acumulated frame
>> gl_FragColor = vec4(t1.r);
>> float r = ((1.-motionblurstrenght)*t2.r) + (t1.r);//motion blur
>> gl_FragColor = vec4(r);
>> }
>> --
>>
>>
>> do you have a clean example or hints on how to implement this ?
>> i am currently fighting with gemframebuffer and pix_texture
>> and rendering order and texunits .
>> and i feel i'm missing something ..
>>
>> i would like , if possible to keep this as an effect i can turn on and
>> off , without modifing my current gem chains .
>>
>> i think i need two gem chains ,one early and one at last in the frame
>> drawing chronology , but i can't make it though i tried a lot
>>
>> any help appreciated .
>>
>> Pierre-Yves
>>
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>
> This example could help, see attached.
> ++
>
> Jack
>
>
>
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