I have new problem couldnt find any solution in Google ... im using a qml file and it contain a surface3d , when i show it with a obj file that was in qt examples (oilrig) it could show correct without any problems!
but when i used my own obj file (boat) it couldnt show correct in surface3d application (showing with grid Triangles, not like a volume ...)
in blender(a program for editing 3d models) my boat and oilrig has correct views but in surface3d just oilrig is true! i tested 100 items more that downloaded from internet but cant work , just oilrig that was from qt examples was true can any one help me????
ok i found a Temporary solution that was usefull for me.
1- convert that model in blender to ".dae"
2- upload it in scene editor online
3-convert it to Model (from NULL)
4-export as .obj file and use it in QT ^_^