Interpolation function coefficients

[tanajikamble13]

Hi, Thanks for sharing the work. I want to fit curved line through given points. I am unable to understand how you chose the coefficient for interpolation function e.g. for CatmullRom you use the following function

interpolate(double u, const Vector& P0, const Vector& P1, const Vector& P2, const Vector& P3)
{
	Vector point;
	point=u*u*u*((-1) * P0 + 3 * P1 - 3 * P2 + P3) / 2;
	point+=u*u*(2*P0 - 5 * P1+ 4 * P2 - P3) / 2;
	point+=u*((-1) * P0 + P2) / 2;
	point+=P1;

	return point;
}

Can I use more than four control points ? I tried with more than four point but algorithm considering only 4 control points. Please help me, I am waiting for you reply. Thanks in advance !!

[keshwh-work]

I don’t think the function listed below is mine. Sorry.

Kevin

On Wed, Sep 18, 2019 at 6:57 AM tanajikamble13 [email protected] wrote:

Hi, Thanks for sharing the work. I want to fit curved line through given points. I am unable to understand how you chose the coefficient for interpolation function e.g. for CatmullRom you use the following function

interpolate(double u, const Vector& P0, const Vector& P1, const Vector& P2, const Vector& P3) { Vector point; point=uuu*((-1) * P0 + 3 * P1 - 3 * P2 + P3) / 2; point+=uu(2P0 - 5 * P1+ 4 * P2 - P3) / 2; point+=u((-1) * P0 + P2) / 2; point+=P1;

return point; }

Can I use more than four control points ? I tried with more than four point but algorithm considering only 4 control points. Please help me, I am waiting for you reply. Thanks in advance !!

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[CycloneRing]

hi @keshwh-work, the function is yours i can confirm, here it is : https://github.com/chen0040/cpp-spline/blob/198aa5c31190f64b0813700e014a501ee9aa940f/spline/src/main/cpp/CatmullRom.cpp#L31

He's right after we add more points it goes bad, This is a very good library you made, best on github if you can fix this it will be great, I'm using it right now in a real time app and it works great

https://user-images.githubusercontent.com/91777373/176567966-fafdc17d-aebc-4770-9d75-bbb5b7df23a2.mp4