varying vec4 Color;
varying float LightIntensity; 

uniform float Density;
uniform float Frequency;

void main()
{
	float s = gl_TexCoord[0].s;
	float t = gl_TexCoord[0].t;

	float sf = s * Frequency;
	float tf = t * Frequency;

	vec2 st  = gl_TexCoord[0].st;
	vec2 stf = st * Frequency;

	
	// if( fract( sf ) >= Density  &&  fract( tf ) >= Density )
	if( all( fract(stf) >= vec2(Density,Density) ) )
		discard;

	gl_FragColor = vec4( LightIntensity*Color.rgb, 1. );
}