Hi everybody, well, this is my first post and it's about a problem hehe... Quickly, I made a building for my track project, I've made walls and little objects without problem, but look: This is how the object looks in 3dsmax. http://img69.imageshack.us/img69/7369/edf01.jpg Here in BTB http://img7.imageshack.us/img7/6654/edf02.jpg and here, into the game... http://img7.imageshack.us/img7/8279/edf03.jpg Looks every transparent, can't collide with it, and I drive and see through it... I've check the double-side in xpacker and BTB, collide object and render too... but I donno know whats going on :frown:... pd. sorry for my english. Thanks!!!