I set 27 points and snap to them in exact same order to create curves from degree 1 to 11:

then I moved same control point for each curve by exactly the same movement:

Now I want to intersect each couple of curves with identical degrees (intersect the two with degree one; then intersect the two with degree two; then intersect the two with degree three and so on until intersect the two with degree eleven)

Generally when I create a copy of curve and move just one control point of the copied version, and then intersect the curve with itsâ€™ modified version, I supposed to see witch parts of the curve remains the same an witch parts change under the influence of that one control point: I supposed to see the range of influence of control points; ok?!

But it doesnâ€™t work! I donâ€™t know why but I can show you one example!

I considered post selecting and pre selection and it makes no difference!

at the end:

- Is my approach good enough toward Exploring the range of influence of control points
- Whatâ€™s wrong whit intersection command??

this is the file if you need it:influence of control points - intersction problem.3dm (157.3 KB)