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Threedimensional means having three dimensions, those being height, width, and depths  coincidentally, just like in real life. However, this is different than early Twoandahalfdimensional, such as Doom, Duke Nukem 3D, which used advnance mathematical calculations to simulate 3D by rotating or scaling textures to simulate a 3D effect. Even games like FZero and Super Mario Kart, while satisfing the requirnments of having height, width, and depths, relied on technologies like Mode 7 for rotating and scaling sprites to simulate "Three Dimensions"
Arguably, threedimensional video games came into their own with the Sega Saturn/Sony Playstation/Nintendo 64, but there were several Super NES and similarera games that used technology like an "Super FX chip" (like Star Fox and Super Mario World 2: Yoshi's Island) to achieve grainy 3D effects.
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[[File:thumb160pxA 3D box]] 3D (or 3D) means three dimensional, or having three dimensions. For example, a box is three dimensional; it is solid, and not thin like a piece of paper. It has volume, a top and bottom, left and right (sides), as well as a front and back. You can turn the box around to view it from another side (called a face, surface or simply side).
A dimension is measurable in inches, centimeters, miles, kilometers, or any other unit of length.
The three dimensions are called length (or depth), width (or breadth), and height.
3D graphics are used to make video games or animated movies. A lot of calculations are needed to make pictures seem three dimensional on a screen.
[[File:thumb160pxPicture of the "X axis", "Y axis", and "Z axis".]]
[[File:thumb160pxA 3D mathematical picture, or graph, with lines measuring width, height, and length.]]
In mathematics (maths), length, width, and height are given letters (variables) to make them easier to write, or if a value is not known. X is width, Y is height, and Z is length.
The mathematical study of shapes and dimensions is called geometry. Geometry can be used to measure how tall a mountain is.
Some people see time as a fourth dimension. It is also measured. It is measured in units of time such as seconds, hours, years, or any other measurement of time.
