Rendering a 3D object without taking optic distortions into account. Normally, the parts of an object closer to the eye appear gradually larger whereas those farther appear gradually smaller, and this is called perspective. If the effect of perspective is discarded, the edges of an object which normally converge when they are far enough from the viewer, become parallel. In other words, one can see all visible external edges all the way to the end without any loss of detail because there is no convergence. Of course you need to rotate the object along the width and depth dimensions otherwise you will see only one side of it. The angle of rotation (α) is normally around 30 degrees.