Automatic UV generation

[rouncer]

Im writing a modeller, and im planning on adding semi automatic uv unwrapping.
the planar objects are brush selected by the user, but I want to organize the triangle clusters on the uv chart automatically.

This means the computer has to find free spaces and insert the clusters and make sure it wastes least space possible.

Could anyone help, is there anything on the net about this and what keywords should i use in the search?

Thanks alot if anyone can help.

[rouncer]

Ive thought a bit more and ive decided on a way to get started, so ill be ok.
thankyou.