mikeman22@hotmail.com

Im having a hard time understanding how to affect a gridshape or mesh with a shader. I am hoping to make interesting deconstructions of geometry using a variety of shaders to manipulate the vertices and the colours of the vertices in an interesting way including rotaion and scale.

below is a simple idea, however I want to start create some interesting geometric shapes and behaviours.

Does anyone know any cool shader programs that can do neat things with geometry that they want to share?

Im having a hard time understanding how to affect a gridshape or mesh with a shader.  I am hoping to make interesting deconstructions of geometry using a variety of shaders to manipulate the vertices and the colours of the vertices in an interesting way including rotaion and scale.

below is a simple idea, however I want to start create some interesting geometric shapes and behaviours.  

Does anyone know any cool shader programs that can do neat things with geometry that they want to share?   

deconstructing-geometry-using-shaders

http://www.youtube.com/watch?v=qRr1d7ETAIc

heres an example of what I mean.
http://www.youtube.com/watch?v=qRr1d7ETAIc


As a starting point, check out the shaders in Cycling '74/jitter- 

shaders/vert-displace/. vade has made a couple vertex shaders, too, 

As a starting point, check out the shaders in Cycling '74/jitter- 
shaders/vert-displace/.  vade has made a couple vertex shaders, too,  
which can be had at http://001.vade.info.  hope that helps.  :)

you can use the 'discard' keyword in glsl to remove pixel fragments. 

Ive been meaning to make a 'outdo vvvv' shader. ahem.

adding that to a lighting shader should be fairly easy.

On Jan 30, 2008, at 10:32 AM, Dan Winckler wrote:

> As a starting point, check out the shaders in Cycling '74/jitter- 

> shaders/vert-displace/. vade has made a couple vertex shaders, too, 

you can use the 'discard' keyword in glsl to remove pixel fragments.  
Ive been meaning to make a 'outdo vvvv' shader. ahem.

> As a starting point, check out the shaders in Cycling '74/jitter- 
> shaders/vert-displace/.  vade has made a couple vertex shaders, too,  
> which can be had at http://001.vade.info.  hope that helps.  :)
>
>


the video you linked to looked more like spline effects than vertex shader deformations.

try checking out js_jitterspline-example.pat and jsglnurbstendril-example.pat in the jitter examples folder.

the video you linked to looked more like spline effects than vertex shader deformations.
try checking out js_jitterspline-example.pat and jsglnurbstendril-example.pat in the jitter examples folder.


It reminded me of Sanch's supershape vertex shaders.

On Jan 30, 2008 11:23 AM, Robert Ramirez wrote:

> the video you linked to looked more like spline effects than vertex shader deformations.

> try checking out js_jitterspline-example.pat and jsglnurbstendril-example.pat in the jitter examples folder.

It reminded me of Sanch's supershape vertex shaders.
http://www.sanchtv.com/
wes

On Jan 30, 2008 11:23 AM, Robert Ramirez  wrote:
>
> the video you linked to looked more like spline effects than vertex shader deformations.
> try checking out js_jitterspline-example.pat and jsglnurbstendril-example.pat in the jitter examples folder.
>
>


Im not familiar with the v4p format that sanch uses. Can anyone show me how to use these shaders?

Im not familiar with the v4p format that sanch uses.  Can anyone show me how to use these shaders?


v4p is the vvvv patch file format. It's not a shader. The shaders are here:

http://vvvv.org/tiki-index.php?page=User+Shaders

> Im not familiar with the v4p format that sanch uses. Can anyone show me how to use these shaders?

v4p is the vvvv patch file format.  It's not a shader.  The shaders are here:
http://vvvv.org/tiki-index.php?page=User+Shaders
wes

On Jan 30, 2008 1:01 PM, Mike  wrote:
>
> Im not familiar with the v4p format that sanch uses.  Can anyone show me how to use these shaders?
>
>
>


in the vd.twist.jsx shader in the jitter_shader folder what does mat4 mean in the ModelViewProj parameter mean. I know its a symbol but I dont know what a symbol is. please help

in the vd.twist.jsx shader in the jitter_shader folder what does mat4 mean in the ModelViewProj parameter mean.  I know its a symbol but I dont know what a symbol is.  please help 

it's a 4x4 matrix. You're looking at a Cg shader which is very

different than a GLSL shader. Have a look at the Cg spec for more

> in the vd.twist.jsx shader in the jitter_shader folder what does mat4 mean in the ModelViewProj parameter mean. I know its a symbol but I dont know what a symbol is. please help

> #P newex 340 441 162 9109513 jit.gl.handle me @inherit_transform 1;

> #P newex 269 284 146 9109513 jit.gl.gridshape me @shape plane;

> #P newex 269 505 63 9109513 jit.window me;

> #P newex 269 478 174 9109513 jit.gl.render me @erase_color 1. 1. 1. 1.;

> #P message 471 349 109 9109513 param ModelViewProj 1$;

> #P flonum 420 325 35 9 0 0 0 139 0 0 0 221 221 221 222 222 222 0 0 0;

> #P message 375 350 81 9109513 param amount $1;

> #P newex 312 377 145 9109513 jit.gl.slab me @read vd.twist.jsx;

> #P comment 491 325 100 9109513 ???????;

it's a 4x4 matrix.  You're looking at a Cg shader which is very
different than a GLSL shader.  Have a look at the Cg spec for more
info.
wes

On Jan 30, 2008 2:43 PM, Mike  wrote:
>
> in the vd.twist.jsx shader in the jitter_shader folder what does mat4 mean in the ModelViewProj parameter mean.  I know its a symbol but I dont know what a symbol is.  please help
>
> max v2;
> #N vpatcher 369 29 1322 643;
> #P window setfont "Sans Serif" 9.;
> #P window linecount 1;
> #P newex 340 441 162 9109513 jit.gl.handle me @inherit_transform 1;
> #P newex 152 312 45 9109513 t b erase;
> #P toggle 154 250 15 0;
> #P newex 154 275 50 9109513 qmetro 30;
> #P newex 269 284 146 9109513 jit.gl.gridshape me @shape plane;
> #P newex 269 505 63 9109513 jit.window me;
> #P newex 269 478 174 9109513 jit.gl.render me @erase_color 1. 1. 1. 1.;
> #P message 471 349 109 9109513 param ModelViewProj 1$;
> #P flonum 420 325 35 9 0 0 0 139 0 0 0 221 221 221 222 222 222 0 0 0;
> #P message 375 350 81 9109513 param amount $1;
> #P newex 312 377 145 9109513 jit.gl.slab me @read vd.twist.jsx;
> #P comment 491 325 100 9109513 ???????;
> #P connect 8 0 10 0;
> #P connect 9 0 8 0;
> #P connect 11 0 5 0;
> #P connect 10 1 5 0;
> #P connect 1 0 5 0;
> #P connect 10 0 5 0;
> #P connect 7 0 1 0;
> #P connect 4 0 1 0;
> #P fasten 2 0 1 0 317 367;
> #P connect 3 0 2 0;
> #P pop;
>
>
>


Where can I find these illusive cg specs. Do you have a patched example that uses a cg shader?

Where can I find these illusive cg specs.  Do you have a patched example that uses a cg shader?

http://developer.nvidia.com/object/cg_toolkit.html

In Cg, you're not going to be setting the mat4 parameters (in general

but not always) from a patch in general. Those are defined constants

> Where can I find these illusive cg specs. Do you have a patched example that uses a cg shader?

In Cg, you're not going to be setting the mat4 parameters (in general
but not always) from a patch in general.  Those are defined constants
used by the shader program.

On Jan 30, 2008 3:41 PM, Mike  wrote:
>
> Where can I find these illusive cg specs.  Do you have a patched example that uses a cg shader?
>
> Thanks
>
>
>


deconstructing geometry using shaders