Hi, i want to move/floating a misc_model in my map for example a twinpod. If i do func_bobbing or func_train i always get an error: 
 Error: SV_SetBrushModel: NULL
 How can i float a model?
  
 
  
  
    for the func_bobing one..
 
 Take the clip brushes for the mdoel and make them your func_bobing. Then deselect everything. Next select the model and then the func_bobing and press ctrl+K and a line should appear between the two. Now put the model inside the clip brushes as where you place the model in the editor is where the model shows up in-game.
 
 Have fun :D