float A1[] = {0,0,-5};
	float B1[] = {0,0, 5};
	float B2[] = {0,0,0};
	float v = 1000000;
	for(int i=0; i<1; i++){
		B2[0] = 15*cos(2*PI*i/5);
		B2[1] = 15*sin(2*PI*i/5);
		double d = distanceToTriangle(A1,B1,B2,x);
		v = min(sqrt(d), v); 
	}
	
	return 5.0 - v;