3D Surfer Ball

Building a 3D Surfer Ball Game from Scratch

I've spent the last few weeks trying to get a proper 3D Surfer Ball prototype working, and the reality is a lot less glamorous than the finished product makes it look. The core concept is simple enough — a ball that rolls along a procedurally generated terrain with obstacles and collectibles — but the actual implementation touches on a handful of areas where things can go wrong in different ways depending on your approach. At its foundation, 3D Surfer Ball is an endless runner built around physics-based ball movement. The player doesn't directly control the ball's position through input — instead, they influence direction and speed, and the ball's momentum, gravity, and collision response handle the rest. This is different from a platformer where you're placing the character precisely. Here, the feel comes from the physics interaction, which means your rigid body setup is everything. The terrain is usually a series of connected mesh segments that scroll toward the player or the camera follows the ball forward. Obstacles can be static geometry, moving platforms, gaps to jump over, or objects that change the ball's trajectory. Collectibles are typically simple rotational bonuses or score multipliers. The whole thing runs in real-time at whatever frame rate your target hardware supports.

The Physics Setup — Where Most People Get Stuck

I used Cannon-es for the physics in my build because it plays nice with Three.js and doesn't require a separate runtime download. The ball itself is a sphere rigid body with a radius matching your visual mesh. Here's the part nobody warns you about: the collision material settings matter more than you'd think. If your sphere and ground have the default friction and restitution values, the ball will either slide like it's on ice or stick and barely roll, depending on which side of the default spectrum you land on. For my build, I settled on friction around 0.8 and restitution near 0.1 for the ball-to-ground contact. This gives you a roll that feels responsive without any bounce. The ground mesh needs a convex decomposition or at least a series of triangle colliders that actually match your visual terrain. Using a single Trimesh collider for a complex procedural surface is possible but it killed my framerate on mobile targets. I switched to chunking the terrain into simplified convex pieces per segment and the stable framerate came back almost immediately. One specific problem I ran into: the ball would occasionally tunnel through thin obstacle geometry at higher speeds. This happens because the physics step was running at 60Hz but the ball was moving fast enough between steps to pass through gaps smaller than its velocity per frame. The fix wasn't increasing the physics tick rate across the board — that added overhead everywhere. Instead, I enabled continuous collision detection only on the ball's rigid body and left the static terrain on discrete mode. This cost almost nothing extra on desktop and solved the tunneling on mobile without breaking performance.

Terrain Generation

The terrain for a 3D Surfer Ball game needs to be generated in a way that's both performant and gives you enough variation to keep things interesting. My approach used a simple seeded random system that created segments ahead of the player and destroyed them behind. Each segment had a slight elevation change, maybe a curve left or right, and then obstacles were placed based on difficulty scaling that kicked in at certain distance thresholds. The trick is making the transition between segments smooth. If you just snap one chunk to the next with a height difference, the ball will bounce or stutter. I used a short blend zone at each junction where the vertices of the outgoing segment interpolated toward the incoming one. This kept the collision mesh continuous enough that the physics solver didn't throw weird normal vectors at the ball.

Input and Control

Input is deceptively simple. You're applying lateral force or torque to the ball based on arrow keys or touch tilt. The issue is that raw force application feels floaty. What made the controls actually feel good was a combination of direct torque input and a velocity-based clamp. I set a maximum lateral speed so the ball couldn't accelerate beyond a reasonable threshold, and I used damping to make deceleration feel natural rather than abrupt. Touch control mapped screen X position to lateral force direction, with a deadzone in the center so tiny finger movements didn't cause constant micro-adjustments. For mobile, I found that accelerometer-based tilt was more intuitive than on-screen buttons for this genre. But you have to filter the input. Raw accelerometer data is noisy. A simple exponential moving average with a smoothing factor around 0.15 cleaned it up without introducing noticeable lag.

Common Pitfalls

One thing that surprised me: lighting and shadows are more expensive than you expect in a 3D endless runner. Real-time shadows on a long scrolling terrain will eat your framerate on anything below a mid-range phone. I switched to baked lightmaps for the terrain segments and used simple ambient occlusion for obstacles. The visual difference is minimal in a fast-moving game and the performance gain was significant. Another thing: audio timing. If your jump or bounce sounds are triggered on the physics event directly, they'll sometimes fire slightly late because the audio callback happens after the physics step. The workaround is just to run your sound trigger from the update loop reading the velocity state rather than relying on the collision callback alone. It's a tiny detail but it matters if you're going for polish. The biggest limitation of this approach is that procedural terrain generation has a finite variety. After a certain distance, even with seeded randomness and difficulty scaling, patterns emerge. Players will start recognizing obstacle sequences. This isn't solvable without truly unique content creation, which defeats the purpose of a lightweight endless runner. If you're targeting a casual audience that plays short sessions, it's fine. If you're building something meant for hundreds of hours of play, you'll need a deeper content pipeline.

Getting It Running

The base project I built uses a standard Three.js and Cannon-es stack. You'll need Node.js installed, then you can pull the dependencies and run the dev server. The physics demo works at 60fps on a typical laptop and around 30fps on a mid-range phone. If you want the full project structure or a starting point, the repository is available on GitHub — search for the original author's 3D Surfer Ball release or look for similar physics runner templates. The code is straightforward enough that you can adapt it to your own needs without wrestling through someone else's architecture. My rough build time was about a week for a working prototype with basic terrain, controls, and collision. Going from prototype to a polished release with multiple obstacle types, difficulty curves, and a proper UI took another couple of weeks. Most of that time was spent tuning the physics parameters and fixing edge cases like the tunneling issue I mentioned. If you're starting from scratch, budget that kind of time or you'll be frustrated with how much iteration the physics tuning requires.