Add divisions to mesh after using boolean operator

[Anonymous]

Hey, I am trying to subdivide a cliff/rock geometry to sculpt and vertex-paint it. I used a boolean operator to carve a door and a small corridor in it. This is how it looks:

The entrance

If I now go to "Edit Mesh -> Add Divisions", it will result in this:

The mess

And it gets even worse if I use polySmooth:

There are even faces that cover a part of the door. I already tried to draw a square 'frame' around the door but it will give me the same result. Why does it not divide properly?

Best regards

[mspeer]

Hi!

Subdivide manual around the door.