ok, so after a whole day of looking for solutions, I can't think of anything else to do.
Basicly I use google sketchup to export my model into a dae file, and then I import my dae. into blender, after that I want to export my model out of blender as a ase. file. For this I use a plugin called "Blender ASE export UE3 2.49 : by spelunkarr, it can be found here . My problem is , when I export it , I have an error, a python script error. then when I open my model in gtk, it is just invisible.
google sketchup 8
I hope someone can help me so I can go on mapping.