Well. I was trying to modelling an arm. Started with a poligonal cylinder. Move, scale and rotate some edges to adapt the the cylinder to my rotoscope image. Added more geometry with the knife tool. Rotate and scale the edges created with the knife tool and...I don't know from which point of the modelling process I started to suffer some strange effects.
When I used the knife again, instead of cutting the surface in a normal way, it create edges in strange places and modify the mesh. When I delete points, edges or polygons, it delete to much and move some vertices to far places. And another effect, when I select the object I'm modelling (the arm) and use "freeze all transforms", the object chande drastically its form and become a mess: vertices in all places, ones polygons through others... a mess.
I really don't know what I'm doing bad, and I'm getting really mad. So if someone could help me to find an explanation I would be very glad.
Thanks in advance