Two dimensions are all very well and good, but even the earliest game developers yearned

to extend into the third.

The ability to craft a virtual space.

The forging of a polygon realm.

Of course, with limited hardware it was no mean feat - early 3D games were burdened with

heavy compromise.

The very first were limited to wireframe representations - and although simple, games like Atari's

Battlezone could paint an immersive scene with just a few vector lines.

Similar tech was used to great effect in 1983's Star Wars Arcade: putting the player in the

pilot seat of an X-Wing to recreate the attack on the Death Star, complete with trench run.

Even the 8-bit home micros managed to get in on the wireframe action: space trader Elite's

visuals might have been spartan, but the game offered a huge swathe of space to explore.

The next logical step from wireframe polygons was to fill them with flat shading: a simple

effect, but still tricky to achieve on early systems without dropping the frame rate to

unacceptable levels.

The very first flat-shaded polygonal game was arcade title I, Robot all the way back

in 1983.

It was definitely ahead of its time, but a new paradigm is a tough sell, and the game

would not prove a financial success.

The advanced hardware needed for 3D games and the decline in arcade interest over the

next few years rendered them prohibitively expensive - so it wouldn't be until the end

of the decade that 3D games would become more prevalent.

As home computers became more powerful, certain genres would embrace flat-shaded polygons:

a trademark of early flight simulators, which valued full freedom of movement over arcade

action or graphical detail.

Some driving games employed this technique, too: Geoff Crammond's Stunt Car Racer in 1989

had you driving at breakneck speed round a fanciful track complete with three dimensions.

Not content with dull flat-shading, some turned to hardware tricks to simulate 3D worlds:

and the Super NES' Mode 7 could be considered a rudimentary form of texture mapping.

It was only a half-measure, but an ideal way to introduce a 3D feel to classic 2D action:

and games like Super Mario Kart maintained a healthy frame rate while still giving the

illusion of into-the-screen racing.

The SuperFX coprocessor included in carts like Star Fox enabled polygonal 3D graphics,

blended with sprite scaling effects and other 2D elements.

Offloading graphics onto another processor would prove a useful technique in the future:

but some machines would rely on sheer grunt instead.

IBM-compatible PCs had the benefit of a modular design - along with a price point far aloft

from console hardware.

This meant that by the early 90s, they could start to push graphical boundaries.

However, early PC games could be pretty ugly: 4-colour CGA and 16-colour EGA modes often

left games with a distinctive, simple look.

VGA graphics were a step up, offering 256 colours with far more nuance and a break from

unnaturally bright shades.

Early PC titles would sometimes make use of prerendered backgrounds - games like Alone

In The Dark reserved polygons only for the player and enemies, with the remainder of

the world painted as a bitmap.

This technique is a useful one for preserving limited graphical power: instead of rendering

a full 3D scene, you can instead divert attention to more detailed character models.

Some early games were more ambitious, taking a first-person perspective instead of a fixed

camera view.

Ultima Underworld: The Stygian Abyss was an impressive game that took RPGs into the third

dimension - and in turn would influence the rise of the first person shooter.

One technique that made early texture-mapped games viable was raycasting.

It's an efficient approach to scene rendering that focusses solely on what the player can

see, and when combined with simple level geometry can be made quite performant.

Wolfenstein 3D's levels were built on a simple square grid, all on a single level: this meant

that the walls could be fully texture mapped, while the game remained playable even on a

modest PC.

Wolfenstein is the grandfather of 3D shooters, but in terms of overall impact: Doom was the

daddy.

Building on the Wolfenstein engine, Doom extended its featureset to permit levels with more

organic design: no more fixed grid maps, the addition of variable lighting, and elements

at different elevations.

As a result, Doom was more atmospheric, its locations more believable - and paired with

high-octane action it proved quite the success.

It inspired a huge number of clones, and paved the way for the FPS genre as we know it today.

Many of these early games were reliant on tricks to simulate a 3D world - limited geometry,

the use of sprites - or other time-saving hacks.

True texture-mapped 3D games required a great deal of processing power, and so it wasn't

really until the second half of the 1990s that such games took hold.

Vanguards of hardware, the arcades led the way with titles like Ridge Racer: although

dated today, at the time it was universally praised for its sound and graphics.

Treading in the arcade's footsteps, the fifth generation of consoles could more confidently

tackle full 3D graphics, and so platforms like the PlayStation and Nintendo 64 saw the

rise of the polygon within a home setting.

Super Mario 64 transplanted the previously-planar plumber into a colourful 3D world: and would

prove to be arguably the first successful 3D platform game.

It blended the finest elements and charm of previous Mario titles with new technology

- full freedom of movement and a dynamic camera system that permitted exploration without

frustration.

The PlayStation had its own 3D platforming heroes, with games like Crash Bandicoot: and

despite the low-polygon count afforded by the hardware, its characters are expressive

and its artstyle charming.

These games were not only technically impressive - they were fun to play: true 3D games were

a novelty no more, and instead an integral part of mainstream gaming.

While console hardware arrives in discrete generations, the pace of PC development is

continuous: and with the popularity of PC gaming post-Doom, there was no shortage of

3D titles.

Magic Carpet was an interesting attempt at transplanting Bullfrog's earlier god-game

formula into a third-person perspective.

Hugely impressive from a technical perspective, although its gameplay was slightly lacking

and was otherwise overshadowed by more conventional games of the era.

Descent was notable for its six degrees of movement, permitting full exploration of its

maze-like mines.

A peculiar blend of space shooter and Doom clone, it stands as an important example of

early software rendering - full 3D without shortcuts or compromise.

Id software were prime innovators within the PC gaming space: and not content with the

countless clones their creations spawned, they set the bar even higher with the release

of Quake.

Quake was very much a true 3D game: gone were the sprites and lack of vertical aiming of

Doom, replaced with polygonal enemies, weapon viewmodels and biaxial aiming.

Quake, in all its brown-hued lovecraftian glory, was a prelude to the next wave of 3D

graphics development.

One final footnote worth a mention are voxels: volumetric pixels, an alternate approach to

polygon construction.

Instead of triangular faces, objects are built from 3D pixels: essentially building blocks,

in a manner similar to Minecraft.

Ideal for carving out terrain from heightmaps, games like Delta Force and Outcast are an

interesting example of what would prove to be an evolutionary dead-end.

Although voxels showed some promise, any progress was nipped in the bud by the rise of 3D acceleration.

With dedicated hardware games now had the power to construct smooth and detailed worlds

without compromise.

The magic of hardware acceleration was about to unfold.

Join me in part four, as the pace of 3D technology quickens and we near our approach to the modern

era.

Until then, farewell.