Matt Pfeiffer Matt54

Software Engineer on Apple Platforms - I write a lot of code and some music too

Matt54 / MetalCubeExample.swift

Last active January 6, 2025 17:29

Cube / Sphere RealityView using LowLevelMesh with metal shader

	import SwiftUI
	import RealityKit
	import Metal

	struct CubeSphereState {
	var size: SIMD3<Float> = [0.3, 0.3, 0.3]
	var planeResolution: SIMD2<UInt32> = [16, 16]
	var cubeSphereInterpolationRatio: Float = 0.0
	}

Matt54 / CubeMeshExample.swift

Last active December 7, 2024 17:20

Cube LowLevelMesh RealityView

	import Foundation
	import RealityKit
	import SwiftUI

	struct CubeMeshExample: View {
	@State private var rotationAngles: SIMD3<Float> = [0, 0, 0]
	@State private var lastRotationUpdateTime = CACurrentMediaTime()
	@State private var time: Double = 0.0
	@State private var rootEntity: Entity?

Matt54 / ApplePlaneExample.swift

Created December 5, 2024 04:50

CPU and GPU implementation for Apple's LowLevelMesh plane example

	import Foundation
	import RealityKit
	import SwiftUI

	struct ApplePlaneExample: View {
	var body: some View {
	RealityView { content in
	// Create a plane mesh.
	if let planeMesh = try? PlaneMesh(size: [0.2, 0.2], dimensions: [16, 16]), let mesh = try? MeshResource(from: planeMesh.mesh) {

Matt54 / TurkeyClonesAnimationView.swift

Created November 28, 2024 14:49

RealityView with a grid of animating cloned turkey model entities

	import SwiftUI
	import RealityKit

	struct TurkeyClonesAnimationView: View {
	let scale: Float = 0.02
	let horizontalCount: Int = 4
	let horizontalSpacing: Float = 0.0375
	let verticalCount: Int = 2
	let verticalSpacing: Float = 0.05

Matt54 / GaussianBlurParams.h

Created November 26, 2024 04:15

RealityView with LowLevelTexture and Gaussian Blur (separate compute shader passes)

	// Don't forget to include this bridging header

	#ifndef GaussianBlurParams_h
	#define GaussianBlurParams_h

	struct GaussianBlurParams {
	int32_t kernelSize;
	float intensity;
	};

Matt54 / BreathingLeavesView.swift

Last active November 23, 2024 17:40

RealityView breathing leaves view (LowLevelMesh leaf, CGImage texture, fibonacci lattice, rotate + scale)

	import RealityKit
	import SwiftUI

	struct BreathingLeavesView: View {
	let rootEntity = Entity()
	@State var children = [EntityPositionPair]()
	@State private var rotationAngles: SIMD3<Float> = [0, 0, 0]
	@State private var modulationTimer: Timer?
	@State private var time: Double = 0.0
	@State private var lastRotationUpdateTime = CACurrentMediaTime()

Matt54 / FlamesTextAnimationView.swift

Created November 21, 2024 00:15

RealityView with centered and spaced out extruded text that sequentially fades in/out and has flames for it's material texture

	import SwiftUI
	import RealityKit

	struct FlamesTextAnimationView: View {
	var textLines: [String] = ["WELCOME", "TO", "APP NAME"]
	let commandQueue: MTLCommandQueue
	let computePipeline: MTLComputePipelineState
	@State private var texture: LowLevelTexture?
	let timer = Timer.publish(every: 1.0 / 120.0, on: .main, in: .common).autoconnect()
	@State private var time: Float = 0

Matt54 / LowLevelTextureTextView.swift

Created November 20, 2024 04:24

Animated LowLevelTexture extruded text RealityView that according to the text's bounds

	import RealityKit
	import SwiftUI

	struct LowLevelTextureTextView: View {
	let commandQueue: MTLCommandQueue
	let computePipeline: MTLComputePipelineState
	@State private var texture: LowLevelTexture?
	let timer = Timer.publish(every: 1.0 / 120.0, on: .main, in: .common).autoconnect()
	@State private var time: Float = 0

Matt54 / GameKitManager.swift

Created September 14, 2024 22:33

Trying to figure out the boilerplate for a simple GameKit implementation

	import GameKit
	import SwiftUI

	struct GameTestView: View {
	@StateObject private var gameKitManager = GameKitManager()
	@State private var timer: Timer?

	var body: some View {
	VStack {
	Text("Score: \(gameKitManager.score)")

Matt54 / TargetPracticeView.swift

Created September 14, 2024 14:28

RealityView where users practice target shooting by detecting finger gun gestures and using ray casting to hit virtual targets

	import SwiftUI
	import RealityKit
	import ARKit
	import HandVector

	struct TargetPracticeView: View {
	@State var jointPositions: [HandSkeleton.JointName: SIMD3<Float>] = [:]
	@State var targets: [Target] = []

	@State var laserBeamEntity: ModelEntity?