Ok, step by step:
- First you create the original scene in your 3d app and render it
- then, again in your 3d app, you create what in WME becomes the hidden geometry, that means, you create the walking plane, the blocked areas and waypoints. In your 3d software this is just normal, simple geometry, e.g. planes and cubes. This hidden geometry must of course match your scene layout, so the simplest way to do it is just creating your hidden geometry over the original scene, and then delete the original (and save it under a different name then :-) ). The lights and cameras must remain in your new file.
- When you have finished that you export everything to .3ds
- Last step, in SceneEdit you create a new scene and import both the rendered picture from step one and the 3ds-file. That's it.