I'm trying to make some loop cuts in the mesh I'm using to create a house in order to add interior walls to the house. Every time I try to make a loop cut, it starts rotated across the faces of my mesh rather than straight across the mesh. Is there any way to keep loop cuts from doing this?
After you hit Ctrl+R buttons and place the loopcut in the location you want, press E button to make alignment with the side edges and then F button to change to which side to align. Then you can slide the loop and apply the location with Left Mouth Button.
Note: If the model is unwrapped, Correct UVs option should be enabled in the Loop Cut and Slide operator panel.
Just like Chebhou said the loop cuts follow the topology. See examples below:
What you can do is use the Knife Tool instead of loop cuts. Press K, then C and drag the mouse from left to right.
You may also select the loopcut, position the cursor on it and press S,Y(orX or Z, depending on your situation) and then 0.