[PD] Moving Starfield with GEM

[patrice colet]

hi,
what about using a shader?
I've attached some exemple...

Le 11/09/2015 01:45, Pagano, Patrick a écrit :
>
> ​Hey has anyone done a Star field with GEM?
>
> Do you have a patch i can look at
>
> I would prefer not to use a movie
>
>
> Patrick
>
>
> /Patrick Pagano B.S, M.F.A/
> Audio and Projection Design Faculty
> Digital Worlds Institute
> University of Florida, USA
> (352)294-2020
>
>
> _______________________________________________
> Pd-list at lists.iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20150911/b0604dc6/attachment.html>
-------------- next part --------------
// Cyrille Henry 2007

void main()
{
    gl_TexCoord[0] = gl_MultiTexCoord0;
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

}
-------------- next part --------------
//https://www.shadertoy.com/view/Md2SR3
// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

// The input, n, should have a magnitude in the approximate range [0, 100].
// The output is pseudo-random, in the range [0,1].

uniform vec2 iResolution, iMouse;

float Hash( float n )
{
	return fract( (1.0 + cos(n)) * 415.92653);
}

float Noise2d( in vec2 x )
{
    float xhash = Hash( x.x * 37.0 );
    float yhash = Hash( x.y * 57.0 );
    return fract( xhash + yhash );
}

void main( void )
{	
    // Add a camera offset in "FragCoord-space".
    vec2 vCameraOffset = iMouse.xy;
    vec2 vSamplePos = ( gl_FragCoord.xy + floor( vCameraOffset ) ) / iResolution.xy;

    vec3 vColor  = vec3(0.0, 0.0, 0.0);
	
	// Sky Background Color
	vColor += vec3( 0.1, 0.2, 0.4 ) * vSamplePos.y;

    // Stars
    // Note: Choose fThreshhold in the range [0.99, 0.9999].
    // Higher values (i.e., closer to one) yield a sparser starfield.
    float fThreshhold = 0.97;
    float StarVal = Noise2d( vSamplePos );
    if ( StarVal >= fThreshhold )
    {
        StarVal = pow( (StarVal - fThreshhold)/(1.0 - fThreshhold), 6.0 );
		vColor += vec3( StarVal );
    }
	
	gl_FragColor = vec4(vColor, 1.0);
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: starfield.pd
Type: text/x-puredata
Size: 2884 bytes
Desc: not available
URL: <http://lists.puredata.info/pipermail/pd-list/attachments/20150911/b0604dc6/attachment.bin>