When joining both halves of my model I use remove doubles but that not work on all vertices. I think it is because some vertices are too far apart. Is there a
way i can change the default distance of the vertices when I use remove doubles?
digiman
Is there a
way i can change the default distance of the vertices when I use remove doubles?
Yes, there is. See Buttons Window\Editing\Mesh Tools\Limit.
Another way would be to select the verticies that you want to connect and press ALT+M to weld.
Are you using the Mirror Modifier? There are plenty of older tutorials that show the “old” way of doing this type of modeling. Using the Mirror Modifier, you can adjust the Merge Limit to help avoid this.