1.1 --- a/src/curve.h	Sun Dec 20 07:21:32 2015 +0200
     1.2 +++ b/src/curve.h	Sun Dec 20 08:22:24 2015 +0200
     1.3 @@ -70,9 +70,11 @@
     1.4  	void normalize();
     1.5  
     1.6  	// project a point to the curve (nearest point on the curve)
     1.7 -	Vector3 proj_point(const Vector3 &p) const;
     1.8 -	// equivalent to (proj_point(p) - p).length();
     1.9 +	Vector3 proj_point(const Vector3 &p, float refine_thres = 0.01) const;
    1.10 +	// equivalent to (proj_point(p) - p).length()
    1.11  	float distance(const Vector3 &p) const;
    1.12 +	// equivalent to fabs((proj_point(p) - p).length_sq())
    1.13 +	float distance_sq(const Vector3 &p) const;
    1.14  
    1.15  	Vector3 interpolate_segment(int a, int b, float t) const;
    1.16  	Vector3 interpolate(float t) const;