Attempt Shading + Bezier Bounds (hopefully) correct

[ipdf/code.git] / src / bezier.cpp

diff --git a/src/bezier.cpp b/src/bezier.cpp
index a30a20a..da65336 100644 (file)
--- a/src/bezier.cpp
+++ b/src/bezier.cpp
@@ -59,8 +59,8 @@ static pair<Real, Real> BezierTurningPoints(const Real & p0, const Real & p1, co
        {
                return pair<Real,Real>(0, 1);
        }
-       Real a = (p1- p0 - 2*(p2-p1) + p3-p2);
-       Real b = (p1-p0 - (p2-p1))*(p1-p0);
+       Real a = (3*(p1-p2) + p3 - p0);
+       Real b = 2*(p2 - 2*p1 + p0);
        Real c = (p1-p0);
        if (a == 0)
        {
@@ -74,6 +74,7 @@ static pair<Real, Real> BezierTurningPoints(const Real & p0, const Real & p1, co
        Debug("a, b, c are %f, %f, %f", Float(a), Float(b), Float(c));
        if (b*b - 4*a*c < 0)
        {
+               Debug("No real roots");
                return pair<Real, Real>(0,1);
        }
        pair<Real, Real> tsols = SolveQuadratic(a, b, c);