Hi! I am trying to add a terrain to a total conversion of GTA SA. I have my project in 3ds max. Ok. So I make a plane, not to big, convert it to editable poly, then I go to paint deformation and I modify the plane to be like here:

THEN I put a texture (GTA MATERIAL..., you know...), export it as a dff, make the col file, the txd file, insert them into gta3.img, rebuild the archive, place the object in game with MEd. I was followind the exact procedure as for my all other objects. But when I open the game it works and when the player approaches the plane (that terrain) the game crushes. What to do? I have tried to export the plane as a dff file after I have converted it to a editable mesh - did not work; editable patch - same problem; editable poly - also. I took a plane and fly with it far away from the area where the plane was. I was not so close to the plane. Ok. Then I turned back with the plane, fly with high speed and then I jumped from the plane, letting it go to the plane. Then I activated sa cam hack and using the NUM keys (you know, those from the right side of the keyboard), I was able to see exactly what was going on: the plane went through the plane.
I do not know what to do!!!!!!!!!!!!!!! Please help me to make a deformed and leveled terrain!!!