Draw the basic structure of the log cabin using the rules on perspective and vanishing points. Sketch an X from corner to corner of the center and right-hand vertical lines. Draw a vertical line up through the center to show where the top of the roof will be.
Connect the top of this line with the left point to establish the roof. Draw two diagonal lines to connect the top of the roof with the sides of the cabin. Establish the other edge of the cabin with a vertical line on the left. Start forming the roof with a diagonal line as shown.