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# Maths - I was always told I'd never need it...

Hey Guys!

So I always had a firm belief that unless I was going into a scientific or math based field,
that I would never need Calculus or Trig, or whatever you wanna call it.

But now, I can not for the life of me remember how to calculate a 3D curve…
Nor do the documents on Google make any sense…
This!](http://tutorial.math.lamar.edu/Classes/CalcIII/VectorArcLength_files/eq0008MP.gif) Just confuses me…

I don’t suppose anyone could tell me the gist of it like I’m a five year old?

Thanks a bunch!

-Peace

What you are trying to do exactly?

Rama

Hey Rama!

I’m trying to calculate a smooth curve between 3 simple points,
a bit like how a spline operates. :3

-Peace

Looks to me that that formula calculates the length of the derivative (tangent?) of a 3 dimensional function. Not exactly sure how you need that. If you want to draw smooth curves, checkout http://en.wikipedia.org/wiki/Bézier_curve. These do not require calculus.

Hi Loken!!

you dont have to do any work Loken

Check out InterpCurve.h

I used this to re-implement splines in my own project

as per this video:

Hey Rama!

I wish I had seen this earlier!

I ended up writing my own function in my static library,
which allows me to pass in my 2 points and their handles,
and it returns a point at a specified point using the 0-1 lerp method.

All that math FOR NOTHING
Awk well! At least I’m learning!

Maybe this one is better than mine.
Mine has far too many calcs per tick, and I’m not overly happy with it.

Thanks a bunch as always!

-Peace