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;
	
	float alpha = 1.;
	if( fract( sf ) >= Density  &&  fract( tf ) >= Density )
		alpha = 0.;

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