Well, I finally got my static building models to work somewhat correctly so I will tell you what I did exactly. I'm not familiar with Sketch Up, I use Truespace, and since I wanted to make some extraordinarily large buildings, I found that I basically had to scale them in Truespace times 50. It worked nicely. You didn't mention anything about texturing so I'm guessing you know your textures need to be named the same as your model (you know your models need to be in .x format) and that if you have .jpg or .png textures that these will be needing to be converted to .dds format. I converted my textures using the free paint.net program - so absolutely simple. Now look, I tried Mass FPE Creator which Joe so kindly made available to us all for free - [href]htp://forum.thegamecreators.com/?m=forum_view&t=200330[/href] - and I tried Green Gandolph's utility and both of these are very nice, but I still had this problem of not having collision detection. It was driving me crazy walking through my buildings. My solution after massive hours of experimentation and hair pulling? I went into the entities file and picked a stock object (that came with the program) that of which I knew had similar features to my models and opened that particular model's FPE file with notebook and simply replaced that particular model's name and texture name with MY model's name and texture name - then named the text file the same as my model, kept the .fpe extension and put it into the folder I created for my own entity (which of course, was placed in the entity file). It took me about 1 minute to edit the file and I'm a slow old man at typing.
I hope this helps somewhat!
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