Hello everyone,
I have now created a straight piece of a Coaster and wanted to ask if it is possible to create out of this piece a perfect curve? Is there a trick to do this?
When I try to create one, by extruding and rotating it doesnt look good 
Hope you can help me 
Its not clear exactly what you want to do. There are numerous ways to make curved meshes so the most appropriate way for your situation isn’t known without more info such as
Screenshots of your current object,
What exactly you want to achieve,
Attach your current blend file,
What blender version are you using.
Ok I ll try to explain with an image :
I have created the left image (Straight Track Piece) and I want to know if there"s a way to create from that straight piece, a curve like on the right image the red lines.
I use the Version 2.46 because the exporter for the Game doesnt work with newer version
Lots of useful info here http://www.rab3d.com/tut_blender.php
You could also use the spin tool
Demo of spin tool http://screencast.com/t/96ohoks8A
Those are not curves, those are clothoids. Also known as spiral curves.
A circle segment as curve would generate too high centrifugal forces on entering the “curve”
3 ways… you can:
I´d use splines really as they allow the best curve control and you can convert them to a mesh any time.
I heard about the Spline Technic, but I dont know what it ist could someone explain it to me ?
well you could do it with other script that can help make curvy lines
like one being develloped right now called Fillet also i did a script in WIP section for Spira;s if that’s what you need as a shape
i mean ther are several scripts that could help you get curvy shapes!
happy 2.5
Why not try using a lattice modifier? Or a simple deform modifier?