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1.1 Introduction

The present module is used to visualize a function F(X,Y) in the form of a surface Z = F(X,Y) defined on a rectangular grid. Different possibilities are offered to the user to define the function.

We obtain a three-dimensional representation of the function by using a hidden-lines algorithm of Williamson. The surface is represented using lines or a grid.

All data typed at the terminal can be saved on file; this file can then be used by the module to execute the session at a later stage.

The utilization of the software is essentially interactive (conversational)( While using this module, the user will note that it differs appreciably from the other graphics modules due to historical reasons.)

Tools for plotting the reference axes automatically are included in the software. The user can also write legends on the plot (using the software characters).

Preprocessor VIS3XX is used to visualize a surface.