*On 19/03/2015 at 06:32, xxxxxxxx wrote:*

Hi,

I've been working with C4D R15 doing some Python programming to create small tools for our specific applications, and have hit a wall with regards to the f-curves.

In an ideal world, I want to know the exact mathematical function that defines any given f-curvewithin C4D in order to do further derivations with it ( *i.e. to obtain exact instantaneous velocity/acceleration* ).

My colleague who is very knowledgeable in mathematics/physics combined with Python and C has created a piece of code that successfully re-creates the Bezier f-Curves shown in the open-source program **Blender**. ** ** This model matches the values in **Blender** exactly, but is still off from the **C4D** f-curve values to varying degrees, depending on the severity of the curvature.

So the questions I have are these:

How exactly are the splines used for C4D f-curve calculated differently than a standard Bezier? Are they in fact Nurb splines?

This is my first post on any forum, so thank you in advance for your patience and help!

--AE