Inkscape. Vectorize for free and without too much pain

A great friend and coworker drew my south park caricature. It was a hand drawing so I scanned and get a dirty grey-scale image, not to nice. So to get something cleaner I realized that I will need to vectorize the image. To do so I was looking for some freeware and I found Inkscape. This open-source software is surprisingly great and the vectorizing tool is awesome for someone like me that was facing this problem for the first time. So in the following lines, I will briefly document how to vectorize a bitmap using Inkscape and the help of The Gimp.

Modelling (II). Playing with subdivision surfaces.

The main idea behind modelling using subdivision surfaces is to create simple geometry that after applying a smoothing algorithm like Catmull-Clark or Loop it finally gets its smoothed and final shape. This way you model the low resolution mesh and you get the higher resolution meshes applying different levels of this smoothing modifiers.

The main problem is that this smoothing algorithms will smooth at all cost and you sometime want to keep several edges chamfered but hard. One way to do this is creating bound edges around the edges you want to be hard.