Step One: Build your ride
http://www.mavisxp.com/screenshots/rct3-tunnel2-1-800.jpg
Step Two: Enclose the ride with scenery objects, then save the enclosure using the Custom Buildings tool . ..
http://www.mavisxp.com/screenshots/rct3-tunnel2-2-800.jpg
Step Three: Delete the ride and scenery, raise the mountain, and re-place scenery
http://www.mavisxp.com/screenshots/rct3-tunnel2-3-800.jpg
Step Four: Add the ride
http://www.mavisxp.com/screenshots/rct3-tunnel2-4-800.jpg
Step Five: Finishing touches!
http://www.mavisxp.com/screenshots/rct3-tunnel2-5-800.jpg
Finally, a couple shots from the inside of the tunnel:
http://www.mavisxp.com/screenshots/rct3-tunnel2-6-800.jpg
http://www.mavisxp.com/screenshots/rct3-tunnel2-7-800.jpg
Même si vous avez 10 ans, je pense que vous comprenez