To All,

I guess relaese this information of my solution here may not be adequate, but I really need a way to draw some attention from Dassault. I apologize in advance for anyone feel offended.

Cubic Bezier curve has been invented over fifty years, people are all expecting its great functionality and productivity to be used in CAD/CAM for free form curve design or photo-realistic solid modeling. However I believe its usage was limited as there is no effective way to solve the intersection points problem either in between curve-to-curve or within a curve itself.

Anyway, the problem is a history now. Enclosed are a picture of cubic Bezier curves’ intersection points and certain data related with the two curves that auto-generated by a program of mine. Anyone, who feels interested are all welcome to verify them for the truth.

Again, allow me to emphasize, my solution is fast, precise and by theory; it is not an approach of approximation like bi-section or bez-clipping or ...

Hunt Chang

Blue Curve control points: P0 (404.000000, 355.000000), P1 (169.000000, 264.000000), P2 (858.000000, 329.000000), P3 (438.000000, 239.000000);

Red Curve control points: P0 (556.000000, 334.000000), P1 (253.000000, 331.000000), P2 (765.000000, 48.000000), P3 (414.000000, 489.000000);
   Self Intersection point at (521.381253777, 332.148294653);  t[1] = 0.844680894, t[2] = 0.042885836;

The Intersection point(s) of those two curves:
  x0(455.734152990, 299.109787062), x1(490.237592592, 250.732158097), x2(542.630905524, 264.568535791), x3(538.123536369, 292.686435169);
Blue Curve's t value(s):
  t[0] = 0.437206056, t[1] = 0.952837683, t[2] = 0.883884689, t[3] = 0.596112430;
Red Curve's t value(s):
  t[0] = 0.232537221, t[1] = 0.453969337, t[2] = 0.713303391, t[3] = 0.780607425;