Harold Serrano

@UC2YJDV1JrhdJ0Tkyy3gWhuw - 2.3K subscribers

I’m Harold — a rendering engineer building a custom game engine from the ground up using Metal. This channel is where I break down how real-time renderers work — not just in theory, but in code. You’ll learn how engines manage rendering pipelines, build frame graphs, sort draw calls, and submit commands to the GPU — all while seeing it happen live inside my engine. Whether you're a graphics programmer, engine enthusiast, or just curious about how a frame really gets drawn, you’ll find deep, visual-first explanations here. Rendering. Architecture. Performance. Explained clearly.

Home Videos Live Playlists

The Performance Fix That Accidentally Solved Anti-Aliasing

The Performance Fix That Accidentally Solved Anti-Aliasing Harold Serrano

61 views - 1 month ago

I Wish I Added This to My Game Engine Sooner

I Wish I Added This to My Game Engine Sooner Harold Serrano

113 views - 1 month ago

I Promised Myself I'd Never Build Another Asset Format

I Promised Myself I'd Never Build Another Asset Format Harold Serrano

49 views - 1 month ago

AI Is Making Engineers Obsolete - It’s Not What You Think

AI Is Making Engineers Obsolete - It’s Not What You Think Harold Serrano

449 views - 1 month ago

I Had To Stop Thinking Like A Graphics Engineer

I Had To Stop Thinking Like A Graphics Engineer Harold Serrano

97 views - 1 month ago

The Debugging Systems I Built for My Game Engine

The Debugging Systems I Built for My Game Engine Harold Serrano

59 views - 1 month ago

The Hidden Cost of Building a Game Engine Editor (Why I Scaled Mine Back)

The Hidden Cost of Building a Game Engine Editor (Why I Scaled Mine Back) Harold Serrano

57 views - 1 month ago

I Thought Unit Tests Would Slow Me Down… I Was Wrong

I Thought Unit Tests Would Slow Me Down… I Was Wrong Harold Serrano

41 views - 1 month ago

I Thought SMAA Would Fix XR Shimmering | Untold Engine

I Thought SMAA Would Fix XR Shimmering | Untold Engine Harold Serrano

37 views - 2 months ago

How I Use Claude to Build My Rendering Engine

How I Use Claude to Build My Rendering Engine Harold Serrano

144 views - 2 months ago

I Tried Rendering This Archviz Scene in Vision Pro… Then This Happened

I Tried Rendering This Archviz Scene in Vision Pro… Then This Happened Harold Serrano

34 views - 2 months ago

Can the Untold Engine Stream a Virtual City on Vision Pro?

Can the Untold Engine Stream a Virtual City on Vision Pro? Harold Serrano

33 views - 2 months ago

I Rendered an F1 Car in Real Life (Vision Pro) | Untold Engine

I Rendered an F1 Car in Real Life (Vision Pro) | Untold Engine Harold Serrano

43 views - 2 months ago

Build Your First Vision Pro Scene with the Untold Engine

Build Your First Vision Pro Scene with the Untold Engine Harold Serrano

24 views - 2 months ago

Untold Engine v0.12.10: Tile-Based Streaming Update

Untold Engine v0.12.10: Tile-Based Streaming Update Harold Serrano

167 views - 2 months ago

Untold Engine Progress — v0.1.2 (Vision Pro, Gaussian Splats, Scripting) | Game Engine Development

Untold Engine Progress — v0.1.2 (Vision Pro, Gaussian Splats, Scripting) | Game Engine Development Harold Serrano

173 views - 6 months ago

Splitting the Untold Engine in Two – New Editor, Website, and VisionOS Support!

Splitting the Untold Engine in Two – New Editor, Website, and VisionOS Support! Harold Serrano

77 views - 8 months ago

From 26.7 ms to 16.7 ms: How a simple Optimization Boosted Performance

From 26.7 ms to 16.7 ms: How a simple Optimization Boosted Performance Harold Serrano

183 views - 10 months ago

Profiling My CPU-Bound Game Engine: 50% Faster Encoder Setup

Profiling My CPU-Bound Game Engine: 50% Faster Encoder Setup Harold Serrano

72 views - 10 months ago

Optimizing My Engine’s Light Pass: Lessons from GPU Profiling

Optimizing My Engine’s Light Pass: Lessons from GPU Profiling Harold Serrano

167 views - 10 months ago

How SSAO Instantly Improved My Engine’s Visuals

How SSAO Instantly Improved My Engine’s Visuals Harold Serrano

270 views - 11 months ago

Progress, Not Perfection: How I Work on My Game Engine Daily

Progress, Not Perfection: How I Work on My Game Engine Daily Harold Serrano

232 views - 11 months ago

I Built An Editor For This One Feature!!!

I Built An Editor For This One Feature!!! Harold Serrano

188 views - 1 year ago

One Step Closer to a Full Game Engine Editor

One Step Closer to a Full Game Engine Editor Harold Serrano

504 views - 1 year ago

My Engine’s Editor Had One Big Problem!

My Engine’s Editor Had One Big Problem! Harold Serrano

155 views - 1 year ago

The Missing System in My Engine!!! - Game Engine Dev

The Missing System in My Engine!!! - Game Engine Dev Harold Serrano

159 views - 1 year ago

Will The Animations Even Work?! - Game Engine Development

Will The Animations Even Work?! - Game Engine Development Harold Serrano

97 views - 1 year ago

I Simplified Game Physics—Here’s How! - Game Engine Devlog 6

I Simplified Game Physics—Here’s How! - Game Engine Devlog 6 Harold Serrano

98 views - 1 year ago

How I Balance Game Engine Development with Other Responsibilities

How I Balance Game Engine Development with Other Responsibilities Harold Serrano

123 views - 1 year ago

Untold Engine Onboarding: The Best Learning Path for Beginners

Untold Engine Onboarding: The Best Learning Path for Beginners Harold Serrano

49 views - 1 year ago

How to Install the Untold Engine: Quick Start Guide

How to Install the Untold Engine: Quick Start Guide Harold Serrano

53 views - 1 year ago

Moving Characters in the Untold Engine: A Beginner's Guide

Moving Characters in the Untold Engine: A Beginner's Guide Harold Serrano

42 views - 1 year ago

Animating in the Untold Engine - A Beginner’s Guide

Animating in the Untold Engine - A Beginner’s Guide Harold Serrano

28 views - 1 year ago

Rendering with the Untold Engine - A Beginner’s Guide

Rendering with the Untold Engine - A Beginner’s Guide Harold Serrano

83 views - 1 year ago

Physics System was broken - Game Engine Devlog #5

Physics System was broken - Game Engine Devlog #5 Harold Serrano

78 views - 1 year ago

Untold Engine - Improving the Physics System (Devlog #4)

Untold Engine - Improving the Physics System (Devlog #4) Harold Serrano

129 views - 1 year ago

How to stop your game engine from crashing? - Untold Engine devlog #3

How to stop your game engine from crashing? - Untold Engine devlog #3 Harold Serrano

95 views - 1 year ago

Untold Engine - Improving the logger (Devlog #2)

Untold Engine - Improving the logger (Devlog #2) Harold Serrano

126 views - 1 year ago

Untold Engine - Improving the Scenegraph (Devlog #1)

Untold Engine - Improving the Scenegraph (Devlog #1) Harold Serrano

138 views - 1 year ago

Getting Started with the Untold Engine: A Simple Beginner’s Guide

Getting Started with the Untold Engine: A Simple Beginner’s Guide Harold Serrano

129 views - 1 year ago

Rebuilding the Untold Engine: Two Years of Progress and What’s Next

Rebuilding the Untold Engine: Two Years of Progress and What’s Next Harold Serrano

185 views - 1 year ago

How I saved my 3D Soccer Game Engine

How I saved my 3D Soccer Game Engine Harold Serrano

1.9K views - 3 years ago

My Game Engine Got me a New Job!!!!

My Game Engine Got me a New Job!!!! Harold Serrano

4.8K views - 3 years ago

Attempted to explain Computer Graphics LIVE - Game Engine Development

Attempted to explain Computer Graphics LIVE - Game Engine Development Harold Serrano

389 views - 4 years ago

The new and improved Untold Engine (v0.0.16) | Game Engine Development

The new and improved Untold Engine (v0.0.16) | Game Engine Development Harold Serrano

3.7K views - 4 years ago

3 things I learned while embedding a scripting system | Game Engine Development

3 things I learned while embedding a scripting system | Game Engine Development Harold Serrano

794 views - 4 years ago

Don't develop a general-purpose Game Engine | Game Engine Development

Don't develop a general-purpose Game Engine | Game Engine Development Harold Serrano

1.9K views - 4 years ago

To Namespace or Not Namespace your game engine | Game Engine Development

To Namespace or Not Namespace your game engine | Game Engine Development Harold Serrano

396 views - 4 years ago

Does making a Game Engine make you a better Game Developer? - (Livestream Clip)

Does making a Game Engine make you a better Game Developer? - (Livestream Clip) Harold Serrano

223 views - 4 years ago

What makes Game Engine Development challenging? (Livestream clip)

What makes Game Engine Development challenging? (Livestream clip) Harold Serrano

184 views - 4 years ago

Play testing the first game made with my game engine

Play testing the first game made with my game engine Harold Serrano

621 views - 4 years ago

5 Misconceptions holding you back - Game Engine Development

5 Misconceptions holding you back - Game Engine Development Harold Serrano

489 views - 4 years ago

How to make a soccer video game with your game engine - Part 2

How to make a soccer video game with your game engine - Part 2 Harold Serrano

10K views - 5 years ago

I'm releasing a game with my engine | Game Engine Development

I'm releasing a game with my engine | Game Engine Development Harold Serrano

612 views - 5 years ago

Sharing the progress of the Untold Engine (v0.0.15) | Game Engine Development

Sharing the progress of the Untold Engine (v0.0.15) | Game Engine Development Harold Serrano

1.8K views - 5 years ago

How long does it take to develop a game engine from scratch? | Game Engine Development

How long does it take to develop a game engine from scratch? | Game Engine Development Harold Serrano

1.6K views - 5 years ago

The one thing I struggle with as a game engine developer - Twitch Highlight

The one thing I struggle with as a game engine developer - Twitch Highlight Harold Serrano

319 views - 5 years ago

Can you make money as an indie game engine developer? Let's give it a shot

Can you make money as an indie game engine developer? Let's give it a shot Harold Serrano

377 views - 5 years ago

Thinking of quitting your game engine development?

Thinking of quitting your game engine development? Harold Serrano

473 views - 5 years ago

Make your game engine API simple to remember

Make your game engine API simple to remember Harold Serrano

542 views - 5 years ago