Blender is not a CAD you and me learned to know and appreciate. Initially I went through a bit of frustration, being seemingly unable to make precise definitions etc.

Here I am trying to collect some means of achieving CAD funcionality one meets elsewhere.

mesh alignment tutorial

Sometimes you just want to align two meshes perfectly. With this recipe you have to separate meshes into separate objects first. Select part of the mesh, pres YKEY to separate from the rest of mesh and then PKEY to make it into a separate object.

Here is the way. Presume we now have two objects, a cube and a plane f.e. Each have a vertex at which we would like to attach them.

• say we have cube and plane. they are aligned direction wise but we would like to put them so close as if they are joined.
• select vertex on one object, where you want meshes to meet, SHIFT+SKEY, 'Cursor to Selection', change to Object Mode (TAB), Center Cursor (SPACE, Transform, Center Cursor)
• select other object, Edit Mode, select destined vertex, SHIFT+SKEY, 'Cursor to Selection'
• Change back to Object Mode, select first object, SHIFT+SKEY, 'Selection to Cursor'

reaching endpoit

• place cursor at desired endpoint as described above
• when drawing an edge (line) you select start point and press EKEY followed by ESCAPE, as if to abort action
• SHIFT+SKEY, 'Selection to Cursor'

reaching midpoint

• cut the line in half using CTRL+RKEY knife tool
• proceed as above

If you would like to join the objects back into single object / mesh, select them and CTRL+JKEY

architecure tutorials

• barn
• large residential building

Blender Resources

• http://www.blender.org/download/resources/
• http://blenderartists.org/forum/showthread?t=43544
• http://www.tellim.com/texture_cd/
• http://www.turbosquid.com/ 3D model market