Long before engineers spun 3D models of airplanes on screens, they designed them with pencils, rulers, and plenty of patience ...
A Spelunker Thought She Found Trash in a Cave. It Was Actually Evidence of a Lost Civilization.
Our guide to how to draw on the iPad starts with the basics, from pairing your Pencil to picking the right apps.
Abstract: With the wide application of CAD drawings in architecture, engineering and manufacturing, the drawing restoration task has become an important challenge to improve the quality and accuracy ...