Matt Pfeiffer Matt54

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

Matt54 / LaserSynthView.swift

Last active March 14, 2025 10:01

RealityView where a cylinder's detected SpatialEventGesture modulates a signal generator's output

	import AVFoundation
	import SwiftUI
	import RealityKit

	struct LaserSynthView: View {
	@Environment(\.physicalMetrics) var physicalMetrics
	let signalGenerator = SignalGenerator()

	@State var outerCylinderEntity: Entity?
	@State var innerCylinderEntity: Entity?

Matt54 / FireballCirclesAddBlendView.swift

Created August 6, 2024 02:16

RealityView resembling a fireball spell created from many low opacity spheres swarming around with add blend mode applied

	import RealityKit
	import SwiftUI

	struct FireballCirclesAddBlendView: View {
	@State var rootEntity: Entity?
	@State var sphereTargets: [Entity: SIMD3<Float>] = [:]
	@State private var rotationAngles: SIMD3<Float> = [0, 0, 0]
	@State private var modulationTimer: Timer?
	@State private var lastRotationUpdateTime = CACurrentMediaTime()

Matt54 / LowLevelMeshNormalsComparisonView.swift

Created August 4, 2024 14:48

RealityView comparing LowLevelMesh spheres with and without surface normal data

	import SwiftUI
	import RealityKit

	struct LowLevelMeshNormalsComparisonView: View {
	var body: some View {
	RealityView { content in
	let sphereWithoutNormals = try! sphereEntity(includeNormals: false)
	sphereWithoutNormals.position.x = -0.11

	let sphereWithNormals = try! sphereEntity(includeNormals: true)

Matt54 / FractalAnimationLowLevelTextureView.swift

Created August 3, 2024 03:57

RealityView applying animating fractal LowLevelTexture to a plane

	import SwiftUI
	import RealityKit

	struct FractalAnimationLowLevelTextureView: View {
	@State var texture: LowLevelTexture?
	let commandQueue: MTLCommandQueue
	let computePipeline: MTLComputePipelineState

	@State private var timer: Timer?
	@State var time: Float = 0

Matt54 / MetalWavyPlaneView.swift

Created July 31, 2024 04:23

RealityView comparing a wave plane animation of a LowLevelMesh between a pure Swift and a Metal shader implementation

	import SwiftUI
	import RealityKit
	import Metal

	struct MetalWavyPlaneView: View {
	@State private var phase: Float = 0.0
	@State private var mesh: LowLevelMesh?
	@State private var timer: Timer?
	let resolution = 250

Matt54 / MetalWavyPlaneView.swift

Last active July 31, 2024 04:21

RealityView comparing a wave plane animation of a LowLevelMesh between a pure Swift and a Metal shader implementation

	import SwiftUI
	import RealityKit
	import Metal

	struct MetalWavyPlaneView: View {
	@State private var phase: Float = 0.0
	@State private var mesh: LowLevelMesh?
	@State private var timer: Timer?
	let resolution = 250

Matt54 / AppleExampleShader.metal

Last active August 10, 2024 00:00

Apple's LowLevelMesh example - Swift vs Metal comparison

	#pragma once

	#include <metal_stdlib>
	using namespace metal;

	struct MyVertex {
	float3 position [[attribute(0)]];
	};

	kernel void apple_example_update_mesh(device MyVertex* vertices [[buffer(0)]],

Matt54 / WavyPlaneView.swift

Created July 29, 2024 04:05

RealityView with a plane (modulated by a sine wave) and a point light

	import SwiftUI
	import RealityKit

	struct WavyPlaneView: View {
	@State private var phase: Float = 0.0
	@State private var mesh: LowLevelMesh?
	@State private var timer: Timer?
	let resolution = 60

	var body: some View {

Matt54 / MorphingSphereLowLevelMeshView.swift

Created July 28, 2024 12:29

RealityView using LowLevelMesh to create a morphing sphere

	import RealityKit
	import SwiftUI
	import GameplayKit

	struct MorphingSphereLowLevelMeshView: View {
	let rootEntity: Entity = Entity()
	let latitudeBands = 20
	let longitudeBands = 40
	var vertexCapacity: Int {
	return (latitudeBands + 1) * (longitudeBands + 1)

Matt54 / OcculationMaterialView.swift

Created July 27, 2024 19:44

RealityView where sphere is hidden and unhidden by a box with occlusion material applied

	import SwiftUI
	import RealityKit

	struct OcculationMaterialView: View {
	@State var rootEntity: Entity?
	@State var occlusionMaterialScale: Float = 1.0
	@State var rotationAngle: Float = 0
	@State var time: Double = 0.0
	@State var lastRotationUpdateTime = CACurrentMediaTime()
	@State var timer: Timer?