Sketchpad was an innovative system developed in by Ivan Sutherland as part of his PhD thesis. It is a tribute to Sketchpad’s uniqueness that it defined a. The Sketchpad system makes it possible for a man and a computer to converse rapidly through the medium of line drawings. Heretofore, most interaction. Sketchpad: Sketchpad, the first interactive computer-graphics program. Sketchpad originated as American engineer Ivan Sutherland’s doctoral thesis project in.

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CAD software – history of CAD CAM

His company Evans and Sutherland founded together with his friend Sketchpsd Evans has done pioneering work in the field of real-time hardware, accelerated 3D computer graphics, and printer languages.

For example, to make two lines parallel, he successively points to the lines with the light pen and presses a button. The topological connections of the drawing are automatically indicated by the user as he sketches.

Ivan’s first big computer program was to make Simon divide. Our editors will review what you’ve submitted, and if it meets our criteria, we’ll add it to the article. View all posts by David. In Sutherland collaborated with David Evan at the University of Utah in Salt Lake City to initiate one of the first educational computer-graphics labs.


The computer possessed KB kilobytes of memory and powered a cm 9-inch cathode-ray tube CRT display. Sutherland paid careful attention to the structure of data representation, which made his system useful for the interactive manipulation of images.

Sketchpad of Ivan Sutherland: This Amazing Footage Shows What CAD Looked Like 55 Years Ago!

Next Sketching in Code. Sketchpad ran on the Lincoln TX-2 computer, an innovative machine designed in it had a large amount of memory for its time: Arbitrary symbols may be defined from any collection of line segments, circle arcs, and previously defined symbols. Sorry, your blog cannot share posts by email. Any change in the definition of a symbol is at once seen wherever that symbol appears.

Sadly, it was only operational for a short time period. Massachusetts Institute of Technology. Please note that our editors may make some formatting changes or correct spelling or grammatical errors, sutherlanx may also contact you if any clarifications are needed. The main idea was to have master drawings which one could instantiate into many duplicates.

Using the light pen and input buttons, you could draw directly on the screen, using a crosshair cursor. Sutherland received the Turing Award from the Association for Computing Machinery in for the invention of Sketchpad. Sketchpad was designed to be extensible, with provision for adding both new graphical element types, and new constraint types.

It not only supported explicit constraints, added to entities after ssutherland were drawn, it supported implicit constraints, setchpad as entities were ovan. It is a tribute to Sketchpad’s uniqueness that it defined a GUI Graphical User Interface more than 20 years before the term was first used. The Regents of the University of California.


He co-created the first virtual reality and augmented reality head-mounted display. Sketchpad encountered a critical challenge that remains central to human-computer interaction.

Sketchpad – Inventing Interactive

In other projects Wikimedia Commons. Computer programdetailed plan or procedure for solving a problem with a computer; more specifically, an unambiguous, ordered sequence of computational instructions necessary to achieve such a solution. We welcome suggested improvements to any of our articles. Prior to Sketchpad, no one had ever drawn engineering drawings directly on a computer display.

James Pyfer Learn More in these related Britannica articles: His first computer experience was with the famous computer Simon of Edmund Berkeley. He taught at Harvard, University of Utah, and Caltech. How objects in Sketchpad could be visualized and modeled on a screen became the foundation for modern graphical computing used in advertising, business, entertainment, architecture, and Web design.

Sketchpadthe first interactive computer-graphics program. Sketchpad stores explicit information about the topology of a drawing.