// Centre of circle
vec2 ctr;
// Intersection tangents (or just p1-p0 and p2-p1)
vec2 tan1;
vec2 tan2;

// Get normal angles (ie. which angle points towards the intersection point)
var ang1 = atan2(tan1.y, tan1.x) - PI/2;
var ang2 = atan2(tan2.y, tan2.x) - PI/2;
// Get delta between angles
var angD = ang2 - ang1;
angD -= 2PI * round(angD / 2PI);
// Calculate number of segment points
// (5 points per 180 degree turn)
int segC = abs(angD) / (PI/5);
for (int a=0; a<segC; ++a) {
    // Stepping angle between the intersection points
    var ang = ang1 + angD * a / (segC - 1);
    // Calculate new vectors
    var tan = vec2(cos(ang), sin(ang));
    var nrm = vec2(-sin(ang), cos(ang));
    points.Add(ctr + tan * Radius - nrm * Width);
    points.Add(ctr + tan * Radius + nrm * Width);
}