ping_ps.txt
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ping_ps.txt
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	#define pi 3.141592653589793238462643383279
	#define twopi (pi * 2.0)
	varying vec2 rcoords;

	const float maxRad = 0.9;
	const float minRad = 0.7;

	void main() {
	float r = length(rcoords);
	vec4 color = gl_Color;
	if(r < minRad \|\| r > maxRad)
	discard;

	float alpha = abs(r - (minRad + (maxRad - minRad) / 2.0));
	alpha /= (maxRad - minRad);
	alpha = 1.0 - alpha;
	color.a *= alpha;

	gl_FragColor = color;
	}