try to place your 2 spheres in 2 differents [gemhead],
or use [separator. In your example you apply 2 differents rotations (one after the other) to 1 gemhead, so the 'glitch' effect

for easy to use "shadertoy glsl" to "gem glsl" you can use theses examples here :
https://github.com/danomatika/BangYourHead/tree/master/7.Graphics/10.Shaders/2.ShaderToy

basically you have to copy/paste this glsl header code to be compliant with gem :

/////////////////////////start Pd Header
// 2015 Sofy Yuditskaya
// put all the shadertoy constants here for ease of use

uniform vec3      iResolution;           // viewport resolution (in pixels)
uniform float     iGlobalTime;           // shader playback time (in seconds)
uniform float     iTimeDelta;            // render time (in seconds)
uniform int       iFrame;                // shader playback frame
uniform float     iChannelTime[4];       // channel playback time (in seconds)
uniform vec3      iChannelResolution[4]; // channel resolution (in pixels)
uniform vec4      iMouse;                // mouse pixel coords. xy: current (if MLB down), zw: click

// changed samplerXX to sampler2D so it would be recognized, you can also change it to samplerCube as needed

uniform sampler2D iChannel0;          // input channel. XX = 2D/Cube
uniform sampler2D iChannel1;          // input channel. XX = 2D/Cube
uniform sampler2D iChannel2;          // input channel. XX = 2D/Cube
uniform sampler2D iChannel3;          // input channel. XX = 2D/Cube

uniform vec4      iDate;                 // (year, month, day, time in seconds)
uniform float     iSampleRate;           // sound sample rate (i.e., 44100)

void mainImage(out vec4 fragColor, in vec2 fragCoord);

// changelog for Pd:
//running mainImage() from main()
// declared Shadertoy's usual variables above
// declared iChannel0...3 variables individually

void main(  )
{
    mainImage(gl_FragColor, gl_FragCoord.xy);
}
//paste ShaderToy code below
/////////////////////////end Pd Header

Works with Pd 0.43.1extended-20110908, G.E.M. 0.93 svn (8 sept too), and natty x86_64.
You did it guido ! Bravo !
And thanks for commenting your code, it help.
Also : it seems that switching masks doesnt work well, only the depth buffer works, I have this warning :

0(12) : warning C7532: global type sampler2DRect requires "#version 140" or later
0(12) : warning C0000: ... or #extension GL_ARB_texture_rectangle : enable
0(31) : warning C7531: global function texture2DRect requires "#extension GL_ARB_texture_rectangle : enable" before use

But it may be my fault as I compiled GEM from svn on x86_64, and I'm not sure about gem's compilation options.

Great ! the dof effect on the video looks very nice, very good job !

with this command :
nm -go Gem.pd_linux | grep ' T ' | grep 'setup' | grep -v '_ZN' | sed -e 's/Gem.pd_linux:...................//' | sed -e 's/_setup//'

It seems that I get all the objects produced by GEM

for more infos (in french) :
http://codelab.fr/2455

Nice thread ! I'm also curious about how to blur specific shapes in G.E.M., my goal is to provide a simple 'depth of field' effect, a kind of blur based on zbuffer.
The 2 solutions I see for now :

• repeat shapes (with [until] or glsl), because once repeated a lot forms could seems to be 'blurred', and more the form is far from the point of view more the shape is repeated
  see Gem/examples/10.glsl/10.geometry.pd or Gem/examples/02.advanced/20.double-gemhead_vs_repeat.pd

• render a scene to a framebuffer, blur specific parts of the frame with a shader, based on zbuffer...

Hi, nice patch !
I think it could be very nice to use texture displacements to animate the thing... ( [pix_coordinate] may do it ? )
for pix_multiimage you can have a look at the attached file...

http://www.pdpatchrepo.info/hurleur/pixel.zip

waaahh nice work and very nice 303 patch !
thanks for sharing this!

hi, i think you have to try others/differents codecs, i don't know with windows what is the best choice, but under linux i usually use MJPEG codec...

send the message [dimen 400 300< (for example) to the [gemwin] object before creating the window...
see the help file for [gemwin] and clic on [pd window property]