Vivek,
in fact the great work is David's, not mine  I made the original
attempt, which was buggy, and then supplied a fix, but David wrote a
new version which was justified mathematically and based on Hain's
paper, as you mention. So I'll have to pass the responsibility for
explaining it to David Bevan.
Best regards,
Graham
On 30/10/2011 08:25, Vivek Rathod wrote:
Hello Graham,
I was looking at the new spline flattening algorithm that you and
David worked on.
The speed up due to this is fantastic. Great work!
I could not understand the part of the code where you compare s_limit
with s
according to Hain's paper
dmax = (s/L) * dnorm ; here s is not normalized. dmax is
the tolerance for flatness and dnorm is the normalized flatness of
the curve.
so s_limit = (dmax / dnorm) * L ; by putting dnorm
= 0.75 we get the permissible height of the control point for the
curve not to be split.
so should we not be comparing s= abs(dy * dxi  dx * dyi)
with s_limit * L instead of s and s_limit
( because s is perpendicular distance of control point multiplied
by L) ?
Am I missing something very obvious?
Thanks,
Vivek Rathod
