CS_Italy_CZ CT Alley:

Here, you can see that in the diagonal alleys there are a bunch of non-diagonal nav areas forming little triangle holes against the walls. I feel that the bots navigate well despite this. Also, you cannot even create areas with diagonal borders. Only verticaly:

You CAN create diagonal areas between different heights, like the jump areas (with the X's) above. This shot also demonstrates the defined grid I speak of. Notice how the one jump area goes through the box. The other box is perfectly set on the grid. This "off-grid" box can be hand tuned to cover the entire top of the box, and re-creating the area between the box-top and the floor. Areas cannot be merged together if they are not exactly the same width, on the grid, on their shared border.
I hope this answers some of your questions.
