Designers use both isometric and perspective sketches to maintain an object’s visual proportions. Isometric sketches are 3D objects drawn with lines that have no vanishing points while perspective sketches are 3D objects drawn with one or more vanishing points.
Designers choose to use an isometric sketch because it is more accurate than perspective drawings and makes the design look more professional. Isometric sketches are much easier to handle because the length of each measure is same as the plan. This is especially for designers drawing pictures by hand. It is time saving and you do not need to calculate the angle of every edge.
