Well unless somebody has a better idea, lets do the cave, ore we can wait 'till after the next entity challenge for a nice change. = )
Finally, here's my completed Klein bottle and Mobius Strip. The Klein bottle could be presented much better with texture/render/lighting properties, but the compile takes too long and I'm too impatient, plus, I've wasted enough time on the damn thing (though it was leagues easier than the mobius strip ; ) )
Klein Bottle DownloadMobius Strip DownloadRead on if ur interested in the construction details:
The Klein bottle was made by simply using alt-e to scale sections of a 12 sided pipe made of "triangles" to the desired thickness and shape. for the curvy parts, I again used alt-e for some more scaling and VM to translate the pipe pieces to look curvy.
One 90-degree joint was needed to make the pipe "flip" back up to the top. to do this I just vmed 2 opposing pipes to make a crude 90-degree corner, and then used VM translations and scaling to make them look ok.
The section where the bottle "flows through itself" is a func_illusionary so you can walk/fall through the pipe. (you can slide/fall/climb through all the pipe sections smoothly, but you will have to noclip to get to the top and in the middle of the bottle.
Render options are normal/additive/100.
lighting is a light_environment at 15 with default light color
Texture scales are set to 3 and the interior of the pipe pieces are nulled out.
Any more questions about the Klein bottle or the Mobius, feel free to pm or ask in the thread! = )