Whats the best way to dynamically create an object in the scene view

I want to build a script/plugin/whatever that enables me to create a 3D object (l-system) and make modifications and tweeks in real time both in the scene view and when running. I'm a programmer but i'm fairly new to unity.
What would be the best way to go about this?

 

This is broadly called procedural geometry and it is really fun and easy in Unity3D. I have an open-source project called MakeGeo that demonstrates a bunch of ways of making stuff.

MakeGeo is presently hosted at these locations:

https://bitbucket.org/kurtdekker/makegeo

https://github.com/kurtdekker/makegeo

https://gitlab.com/kurtdekker/makegeo

https://sourceforge.net/p/makegeo

 

Will check them out.
Thanks