AchrafKassioui

import AVFoundation
import Foundation

@main
struct SpeedUpRecording {

    static func main() async throws {
        guard CommandLine.arguments.count == 3 else {
            print("Usage: speed-up input.mov output.mov")
            return

AchrafKassioui

/**
 
 # SKCameraNode vs Manual Camera: Fiters & Snapshots
 
 A scene that compares SKCameraNode with a manual camera setup.
 https://gist.github.com/AchrafKassioui/9f23cef667aba3ca45c4fc21d48c4acf
 
 ## Dependencies
 
 - SpriteKit Inertial Camera: https://www.achrafkassioui.com/spritekit-inertial-camera/

AchrafKassioui

/**
 
 # SKLight
 
 A sample scene using SpriteKit built-in lighting and hard shadows.
 
 Achraf Kassioui
 Created 27 Jun 2026
 Updated 2 Jul 2026
 

AchrafKassioui

/**
 
 # SKRenderer + Metal Shader
 
 This experiment applies a Metal shader to a specific layer in the scene.
 
 Achraf Kassioui
 Created 1 Jul 2026
 Updated 5 Jul 2026
 

AchrafKassioui

/**
 
 # SKRenderer + MetalKit View
 
 A minimal setup to render a SpriteKit scene with SKRenderer and MTKView.
 
 The same scene can run in two modes:
 - Presented with SpriteView/SKView.
 - Rendered manually with SKRenderer and MTKView.
 

AchrafKassioui

/**
 
 # Sprite Motion Blur
 
 This scene implements per-sprite motion blur with a fragment shader.
 The sprite is larger than the visible shape, so the shader has transparent drawing room around the circle.
 
 Each fragment samples the sprite texture several times along the current movement direction, then averages those samples into one final color.
 The scene updates the blur direction and length from the sprite physics velocity.
 

AchrafKassioui

/**
 
 # Line Shader
 
 A minimal setup to start with SpriteKit shaders.
 
 This setup uses a sprite as a drawing canvas.
 A shader draws a line from point A to point B.
 Touching the scene anywhere updates the point B location and the shader's drawing.
 

AchrafKassioui

/**
 
 # SpriteKit Physics Determinism
 
 Is SpriteKit's physics engine deterministic?
 In some cases, the physics-based behavior is quite repeatable.
 In other cases, the simulation yields a different outcome every run.
 
 This is a setup to explore such behaviors.
 Press one of the buttons to play a sequence.

AchrafKassioui

/**
 
 Code sample for manual camera setup in SpriteKit.
 
 Achraf Kassioui
 Created 27 August 2025
 Updated 28 August 2025
 
 */
import SpriteKit

AchrafKassioui

/**
 
 # SpriteKit Memory Buildup
 
 Testing memory build up of a SpriteKit scene when it is presented again and again.
 
 Achraf Kassioui
 Created 23 November 2024
 Updated 23 November 2024