When people talk about the first true 3D video games, titles like Quake or Super Mario 64 often take the spotlight. These games marked a significant leap forward with fully texture-mapped environments, perspective-correct projection, and dynamic camera control. But this view tends to overshadow a rich decade of 3D experimentation on much less capable machines. To truly appreciate the origins of 3D gaming, we need to roll back to the 8-bit and 16-bit eras, where pushing polygons was a brutal, low-level grind, limited by memory, math, and raw CPU cycles.

The 8-bit Foundations

Writing a 3D game on an 8-bit system like the Commodore 64 or ZX Spectrum was a challenge of epic proportions. These systems had CPUs like the 6510 or Z80, typically clocked under 2 MHz. RAM was sparse—often 48K or less—and there were no floating-point units or hardware multipliers. Everything had to be done in software, often with 8-bit math stretched to fake 16- or 32-bit results.

Take a 16-bit multiplication on a 6510:

; Multiply 8-bit A by 8-bit B, result in 16-bit
clc
ldx #8        ; loop for 8 bits
lda #0         ; clear result low
sta resultLo
sta resultHi

loop:
lsr B          ; shift right B, carry holds current bit
bcc skipAdd    ; if bit not set, skip add
clc
lda resultLo
adc A
sta resultLo
bcc noCarry
inc resultHi
noCarry:
skipAdd:
asl A          ; shift A left for next bit
rol resultHi
rol resultLo

inx
cpx #8
bne loop

This was the sort of routine you'd write just to multiply two numbers. Think about trying to do vector math, matrix transformations, or projection in real time with this.

Yet somehow, developers managed. Games like Elite delivered wireframe 3D on systems with no right to be doing 3D at all. How? Precomputed tables, integer-only math, and incredibly tight assembly code.

The 16-bit Leap

The 16-bit era (Amiga, Atari ST, early PCs) brought huge improvements: faster CPUs (Motorola 68000, x86), more RAM, and hardware that made color and resolution viable for real-time rendering.

But even then, rendering filled polygons was tough. A scene with more than a handful of polygons meant serious compromises. Occlusion was mostly just backface culling and manual z-sorting. Overdraw was rampant. Color palettes were limited.

The 68000, for example, was a joy compared to 8-bit CPUs—32-bit registers, hardware multiply, and full stack access. But it still had no floating-point unit, so most games still ran on fixed-point math.

3D Rotations

Rotating a point in 3D requires matrix multiplication. In floating point, it’s simple. On an 8- or 16-bit system? You’re manually calculating each axis:

// Rotate point (x, y, z) around Y axis
cosA = cos(angle)
sinA = sin(angle)

x' = x * cosA + z * sinA
z' = -x * sinA + z * cosA
y' = y

On a machine with no hardware multiply or sin/cos functions, these had to be:

for y from top to bottom:
    leftX = interpolateEdge1(y)
    rightX = interpolateEdge2(y)
    drawHorizontalLine(leftX, rightX, y)

screen_x = (x / z) * focal_length + screen_center_x
screen_y = (y / z) * focal_length + screen_center_y

invZ = reciprocal(z)  ; precomputed
screen_x = (x * invZ) >> shift

for each pixel in scanline:
    u = uStart + (du * x)
    v = vStart + (dv * x)
    color = texture[u >> 8][v >> 8]
    framebuffer[x][y] = color

u = (u/z), v = (v/z) — per pixel!

for each column:
    ray = shoot_ray(player_pos, angle)
    distance = find_wall_hit(ray)
    wall_height = screen_height / distance
    draw_column(column, wall_texture, wall_height)

When people talk about the birth of 3D games, names like Quake or Super Mario 64 often come up. These titles were revolutionary, no doubt—but to say they were the first 3D games erases an entire decade of groundbreaking work done by developers on much more limited machines.

To understand how 3D games truly evolved, we need to look at the hardware—because it wasn’t just creativity that shaped early 3D—it was silicon.

🎮 My First 3D Experience

I still remember the first time I saw Elite running on an 8-bit machine. Just sitting there, watching this angular wireframe spaceship rotate on the screen... it felt like a glimpse into another universe. It was the mid-80s, and compared to the colorful 2D sprites of the time, this thing looked alien—in the best way possible.

That moment stuck with me—not because the graphics were flashy, but because they defied what I thought the machine could even do.

3D on 8-bit Systems: Wireframes and Imagination

In the mid-1980s, firing up Elite on an 8-bit computer like the BBC Micro or Commodore 64 was a mind-blowing experience. The game presented players with a vast, navigable galaxy rendered entirely in wireframe 3D. For many, it was the first glimpse into a 3D world—even if that world was made of little more than white lines on a black background.

So yes, 3D games were already possible on 8-bit systems. But it wasn’t easy.

These machines had severe limitations: low clock speeds (1 MHz), minimal RAM, no dedicated graphics hardware, and restrictive color formats. Drawing a single wireframe model in real-time was already a feat. Anything more—like filled polygons or shading—was practically out of reach.

Despite this, clever programmers managed to do a lot with a little. They optimized math routines, made the most of fixed-point arithmetic, and worked within tight memory budgets. But the ceiling was low. The hardware dictated just how ambitious a 3D project could be.

The 16-bit Leap: Enter the 68000 Era

When 16-bit systems like the Amiga and Atari ST arrived, the scene changed dramatically. With CPUs like the Motorola 68000, developers suddenly had access to sixteen 32-bit registers, hardware multiplication and division, and support for palette-mapped graphics with more colours. It was like stepping into a new world.

These machines allowed for the jump from wireframe to flat-shaded filled polygons. But even here, the hardware imposed strict boundaries.

Rendering a filled polygon scene is much more expensive than a wireframe one—not just because of the math involved in rasterization, but also because of overdraw. Basic occlusion was usually handled via backface removal and Z-sorting, but that wasn’t always enough to keep the scene efficient. Color depth was another constraint. Without enough shades to work with, developers couldn’t do much more than flat fills.

Games like Starglider II, Stunt Car racer and Carrier Command managed to pull off convincing 3D scenes, but it was always a battle against the machine’s limits. Developers had to be extremely careful about how many polygons they pushed, how often they updated the screen, and how much memory they consumed.

📊 Timeline: 3D Evolution by Hardware Generation

🧮 Pixels Per Second: The Real Bottleneck

At the heart of every 3D breakthrough is one brutal equation:

CPU MIPS / (Desired FPS) / (Screen Pixels) = Cycles per pixel

On 486-era PCs, you finally had enough bandwidth to push full scenes at playable frame rates—if you optimized heavily. A chunky 8-bit pixel framebuffer (like 320×200x8) gave you direct access and kept memory usage down. Add in a fast CPU and enough RAM to hold texture data, and you could finally do real-time 3D with texture mapping.

Games like Ultima Underworld and Wolfenstein 3D cracked the door open, and by the time Quake hit in '96, the door had been kicked wide open.

🎯 Conclusion: Step by Step, Frame by Frame

3D gaming didn’t explode out of nowhere—it evolved, one frame at a time. Every generation of hardware set the ceiling for what developers could achieve, and every innovation in CPU, memory, or video hardware opened new doors.

The early 3D pioneers didn’t wait for permission. They squeezed every cycle, hacked every register, and tricked every display chip into doing what it was never meant to do—all in the name of chasing that extra dimension.

So while Quake and Mario 64 were turning points, let’s not forget the decades of 3D ingenuity that paved the way—one pixel at a time.

The idea behind this project was simple: Could I recreate a Wolfenstein 3D-style engine in PlayBASIC while maintaining good perspective but using affine texture-mapped polygons instead of traditional raycasting?

Floors and Ceilings: Subdivision for Perspective

Classic Wolfenstein 3D engines rely on raycasting, but I wanted to explore using polygons. This introduced two key challenges: rendering walls and handling floors/ceilings. I tackled floors first by subdividing floor tiles near the camera, ensuring that closer surfaces were represented with a denser set of polygons. This approach worked well, maintaining an accurate perspective without excessive computational overhead.

Walls: Adaptive Subdivision

I applied the same technique to walls, subdividing them based on their distance from the camera. Surfaces closer to the viewer were represented with more polygons, while those farther away used fewer. This adaptive approach preserved scene perspective while optimizing performance.

Ensuring Proper Polygon Order

A major challenge with polygon-based rendering is ensuring proper drawing order. Since walls, floors, and ceilings are drawn as independent polygons, z-fighting (incorrect layering of polygons) can be an issue. To address this, I implemented a two-pass rendering system:

1. 1. First, floors and ceilings are drawn.
2. 2. Then, walls are rendered on top.

This method prevents z-popping artifacts commonly seen in painters’ algorithms and produces a visually appealing scene.

Enhancing the Classic Wolf 3D Look: Adding Light Mapping

To push beyond the classic Wolfenstein 3D aesthetic, I added a light mapping pass. Implementing this in PlayBASIC required rendering the scene twice—essentially brute force—but the cost was only around a 20% performance hit. The visual improvement, however, was well worth it.

The process involved:

1. 1. Drawing the texture-mapped scene.
2. 2. Overlaying a Gouraud-shaded version of each triangle, where each pixel’s color was alpha-blended with the background.

This resulted in a real-time light-mapped scene with a Doom-like atmosphere, enhancing immersion and depth.

Pushing Further: 3D Polygonal Characters Instead of Sprites

A long-standing idea I wanted to explore was replacing traditional 2D sprites with 3D polygon-based characters. This concept originated from my work on a rendering engine called "Reality" for Amiga computers back in 1995, which aimed to integrate both sprites and 3D objects within a scene.

Implementing 3D Objects

To bring this concept into PlayBASIC’s Wolf 3D engine, I needed a way to load and render 3D models. I chose the DirectX ASCII format due to its simplicity. The loader extracted three key components: