Planometric- good technique to show 3dimensional view of a building or a room interior. Plan is drawn first and rotated through 90degrees. Vertical lines are drawn to the required height. If vertical lines appear distorted reduce vertical height by 2/3. circles are constructed normally. Exploded – shows how a product is assembled. Usually drawn as exploded isometric, perspective or planometric. Parts need to be close enough together to be able to visualise how they go together. One point perspective – the closer an object is to us the larger it will appear to be. One vanishing point. All vertical lines stay vertical, side lines go to one vanishing point. Two point perspective – the closer an object is to us the larger it will appear to be. Two vanishing points. All vertical lines stay vertical, sides lines go to either of the 2 vanishing points. Isometric – 3D drawings to show 3 faces of an object. Vertical lines stay vertical, side lines are at 30degrees. Isometric circles are created using the segment or compass method. Orthographic – 2D technical drawings that show usually 3 views of a 3D object, front view, end view and plan view. Plan view is always positioned above the front view, front and end views are always viewed from ground level. End view is positioned to the right of the front view (what we see on the right we draw on the right) Show dimensions. Can show hidden detail with dashed lines.