This is wires from an older version of a building I've taken far too long to finish for the minas tirith project. Right now, I'm just trying to clean everything up, hence the topic.
First off, I've been told to avoid having any faces on objects intersecting each other. In this case, it would deal with something I did on one of the roofs:
http://www.webpages.uidaho.edu/~gust4441/buildingmesh2.gif (http://www.webpages.uidaho.edu/%7Egust4441/buildingmesh2.gif) (wireframe: http://www.webpages.uidaho.edu/~gust4441/buildingmesh3.gif (http://www.webpages.uidaho.edu/%7Egust4441/buildingmesh3.gif) )
To get that look on the roof, I split the top polygon several times, and did a series of extrusions. The blocks on the outside were extruded separately. So, there are intersecting faces where the sides of these extrusions meet. In cases like this, does it really matter that there are intersecting faces? Should I take the time to cut the intersecting faces out and form a solid mesh, or just not worry about it?
For that matter, I'm curious about the rule in general. Say you're building an environment for a game, where you have part of a building coming out from the side of a cliff. In cases like this, could you model the cliff side and the building separately, then move the building into place at the side of the cliff until all the edges meet to make it look like it's coming out of the cliff side, or would you want to carefully construct the cliff mesh around the building to prevent any intersections? (Best example I could think of...)
Next question is more aimed at this image: http://www.webpages.uidaho.edu/~gust4441/buildingmesh4.gif (http://www.webpages.uidaho.edu/%7Egust4441/buildingmesh4.gif)
I got those dozens of pieces of geometry in the rings going around the building by dividing polygons several times, and then building from there. What I'm left with though in one part of the image (left side shows it best) is a 28-sided polygon (taking all of its vertices into consideration). I imagine that in some cases, the triangulation on a polygon like that might look bad in a real-time renderer when the lighting comes in (they're using some sort of realtime renderer to demo the minas tirith project...). Should I divide polygons like that up? And if so, how much should I divide them?