## Scale position of points in a circle so it looks like a regular scaling?

Geometric formulae, word problems, theorems and proofs, etc.
probiner
Posts: 1
Joined: Fri Feb 13, 2015 4:35 am
Contact:

### Scale position of points in a circle so it looks like a regular scaling?

I have an Art degree, no math involved, so sometimes when doing 3D graphics and envisioning problems, it's hard to search for solutions over the internet since I don't have good pointers for search terms.
I'm sure this is a trivial problem with a proper name/solution. Basically I just want to grab P and scale its position vector so it matches P', a position on a version scaled by 0.5 on the y axis.

My idea is to apply the same rationale to all three axis, even though I only need to do it on 2, right now.

NOTE: I'm a visual person, if you're going into explanations more than just sharing links, please don't bomb me with long or cryptic functions Thanks

buddy
Posts: 197
Joined: Sun Feb 22, 2009 10:05 pm
Contact:

### Re: Scale position of points in a circle so it looks like a regular scaling?

It doesn't look like P' is half the height of P. Are you maybe scaling the ellipse's height to be half that of the circle, and you're wanting to connect P' on the ellipse to P on the circle?