Q.1    Give some information about 3D Shapes ?

In the broadest definition of the term, "3D" would describe any object that occurs on athree-axisCartesian coordinate system. If that sounds a tad technical, fear not—we'll clear it up right away.

A Cartesian coordinate system is basically a fancy way of describing the X and Y axes we're all familiar with from high-school geometry (think graph paper).

You remember making little graphs and charts with the X axis being horizontal, and the Y axis being vertical, right? Things are very much the same in the world of 3D, with one exception—there's a third axis: Z,which represents depth.

So by definition, any object that can be represented on a three-axis system is 3D. This isn't the whole story, of course.

Chances are you're reading this because you have at least a passing interest in "3D" as it's referred to in thecomputer graphics industry, which includes film, television, advertising, engineering, and video game development.

A few key points on 3D computer graphics:

• The basic definition of 3D space stays the same:Everything about the X, Y, and Z-axis still holds true, but there's one catch. While real world 3D objectsphysicallyexist in three dimensions, in the digital world of computer graphics 3D objects can only be representedmathematically.
• 3D Models:Any representation of an object in digital space, is called a3D model. If you took a look at the raw information that comprises a basic 3D model, it would simply (or not so simply) be a collection of data points that mark thousands or millions of different coordinates in Cartesian space.