Problem with creating a curve line with precise coordinates
@assen_pandov wrote:
If I change "arc and smoothness circle" to "1" is really off, if I put it to 20000 it's closer.. should I leave it to 20000?
Yes. Lower values made a difference in speed back when computer processors were much slower, but with today's processors you may as well leave it at the maximum value.
From the data in the first column of your original post I created three curves.
- polyline (red)
- degree 3 spline (green)
- degree 2 spline
I also added point objects at each data point.
If you zoom in very tightly to one of the data points (I choose the 18th) you would see the following.
The precise location of data point 18 is the red point (and white "X"). If you select either of the splines it's fit point grip #18 will show to be at the data point although the spline itself does not appear to pass through it. The difference could be due to a display issue or the precision of the math used to determine CV location from fit points (not a simple calculation). The green point is the result of adding a point on the green spline using object snap nearest. Obviously it should be exactly on the spline, The white point is the nearest point when clicking on the white spline. I believe there are some approximations being made for speed of display and that may be the cause of the apparent error.
If the red polyline is not smooth enough for your application when you use it to machine a part I suggest using either a 2nd or 3rd degree spline. If you post process cannot handle B-splines then I would use splinedit with a precision of 10 to convert the spline to a polyline that will have more chords and hence will produce a smother machined profile.
