2b:null 2c:["$","title",null,{"children":"Reality Composer Pro × RealityKit | elkraneo's Workspace | Observable"}] 31:T2b67,data = { // ─── Every public Component type in RealityFoundation, with metadata ────── // Fields: name, iOS availability, visionOS availability, platform restrictions, // whether RCP exposes it, functional category, introduced era const components = [ // ── Rendering & Appearance ── { name: "ModelComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: false, cat: "Rendering", era: "Original" }, { name: "OpacityComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Rendering", era: "visionOS 1" }, { name: "ModelSortGroupComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Rendering", era: "visionOS 1" }, { name: "ModelDebugOptionsComponent", ios: "14.0", vos: "1.0", restrict: null, rcp: false, cat: "Rendering", era: "Original" }, { name: "BlendShapeWeightsComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Rendering", era: "visionOS 2" }, { name: "AdaptiveResolutionComponent",ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Rendering", era: "visionOS 1" }, { name: "BillboardComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Rendering", era: "visionOS 2" }, { name: "TextComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Rendering", era: "visionOS 1" }, { name: "MeshInstancesComponent", ios: "26.0", vos: "26.0", restrict: null, rcp: false, cat: "Rendering", era: "26.0" }, { name: "ImagePresentationComponent", ios: null, vos: "26.0", restrict: "visionOS", rcp: false, cat: "Rendering", era: "26.0" }, { name: "EnvironmentBlendingComponent",ios: null, vos: "26.0", restrict: "visionOS", rcp: false, cat: "Rendering", era: "26.0" }, // ── Lighting ── { name: "DirectionalLightComponent", ios: "13.0", vos: "2.0", restrict: null, rcp: true, cat: "Lighting", era: "Original" }, { name: "PointLightComponent", ios: "13.0", vos: "2.0", restrict: null, rcp: true, cat: "Lighting", era: "Original" }, { name: "SpotLightComponent", ios: "13.0", vos: "2.0", restrict: null, rcp: true, cat: "Lighting", era: "Original" }, { name: "ImageBasedLightComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Lighting", era: "visionOS 1" }, { name: "ImageBasedLightReceiverComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Lighting", era: "visionOS 1" }, { name: "EnvironmentLightingConfigurationComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Lighting", era: "visionOS 2" }, { name: "VirtualEnvironmentProbeComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Lighting", era: "visionOS 2" }, { name: "DynamicLightShadowComponent",ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Lighting", era: "visionOS 2" }, { name: "Shadow (Directional)", ios: "13.0", vos: "2.0", restrict: null, rcp: false, cat: "Lighting", era: "Original" }, { name: "Shadow (Spot)", ios: "13.0", vos: "2.0", restrict: null, rcp: false, cat: "Lighting", era: "Original" }, // ── Audio ── { name: "AmbientAudioComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 1" }, { name: "ChannelAudioComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 1" }, { name: "SpatialAudioComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 1" }, { name: "AudioMixGroupsComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 1" }, { name: "AudioLibraryComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 2" }, { name: "ReverbComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Audio", era: "visionOS 2" }, // ── Physics & Simulation ── { name: "CollisionComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: true, cat: "Physics", era: "Original" }, { name: "PhysicsBodyComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: true, cat: "Physics", era: "Original" }, { name: "PhysicsMotionComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: true, cat: "Physics", era: "Original" }, { name: "PhysicsSimulationComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Physics", era: "visionOS 1" }, { name: "PhysicsJointsComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Physics", era: "visionOS 2" }, { name: "ForceEffectComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Physics", era: "visionOS 2" }, { name: "CharacterControllerComponent",ios:"15.0", vos: "26.0", restrict: null, rcp: true, cat: "Physics", era: "iOS 15" }, { name: "CharacterControllerStateComponent",ios:"15.0",vos:null, restrict: null, rcp: false, cat: "Physics", era: "iOS 15" }, // ── Spatial & Scene ── { name: "Transform", ios: "13.0", vos: "1.0", restrict: null, rcp: false, cat: "Spatial", era: "Original" }, { name: "AnchoringComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: true, cat: "Spatial", era: "Original" }, { name: "WorldComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Spatial", era: "visionOS 1" }, { name: "PortalComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Spatial", era: "visionOS 1" }, { name: "PortalCrossingComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Spatial", era: "visionOS 2" }, { name: "GroundingShadowComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Spatial", era: "visionOS 1" }, { name: "SceneUnderstandingComponent",ios: "13.4", vos: "1.0", restrict: "no macOS", rcp: true, cat: "Spatial", era: "Original" }, { name: "DockingRegionComponent", ios: null, vos: "2.0", restrict: "visionOS", rcp: true, cat: "Spatial", era: "visionOS 2" }, { name: "AttachedTransformComponent", ios: "26.0", vos: "26.0", restrict: null, rcp: false, cat: "Spatial", era: "26.0" }, { name: "ReferenceComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Spatial", era: "visionOS 2" }, { name: "SynchronizationComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: false, cat: "Spatial", era: "Original" }, { name: "GeometricPinsComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Spatial", era: "visionOS 2" }, // ── Input & Interaction ── { name: "InputTargetComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Interaction", era: "visionOS 1" }, { name: "HoverEffectComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Interaction", era: "visionOS 1" }, { name: "GestureComponent", ios: "26.0", vos: "26.0", restrict: null, rcp: false, cat: "Interaction", era: "26.0" }, { name: "ManipulationComponent", ios: null, vos: "26.0", restrict: "visionOS", rcp: false, cat: "Interaction", era: "26.0" }, { name: "HitTarget", ios: null, vos: "26.0", restrict: "visionOS", rcp: false, cat: "Interaction", era: "26.0" }, { name: "AccessibilityComponent", ios: "17.0", vos: "1.0", restrict: null, rcp: true, cat: "Interaction", era: "iOS 17" }, // ── Camera ── { name: "PerspectiveCameraComponent", ios: "13.0", vos: "1.0", restrict: null, rcp: false, cat: "Camera", era: "Original" }, { name: "OrthographicCameraComponent",ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Camera", era: "visionOS 2" }, { name: "ProjectiveTransformCameraComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Camera", era: "visionOS 2" }, // ── Animation & Skeleton ── { name: "AnimationLibraryComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: true, cat: "Animation", era: "visionOS 2" }, { name: "SkeletalPosesComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Animation", era: "visionOS 2" }, { name: "IKComponent", ios: "18.0", vos: "2.0", restrict: null, rcp: false, cat: "Animation", era: "visionOS 2" }, { name: "BodyTrackingComponent", ios: "13.0", vos: null, restrict: "no visionOS", rcp: false, cat: "Animation", era: "Original" }, // ── Media ── { name: "VideoPlayerComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: false, cat: "Media", era: "visionOS 1" }, { name: "ParticleEmitterComponent", ios: "18.0", vos: "1.0", restrict: null, rcp: true, cat: "Media", era: "visionOS 1" }, ]; // ─── Derived summaries ──────────────────────────────────────────────────── const pub = components; // all are public (we don't include __* in the list) const iosAvail = pub.filter(c => c.ios !== null); const vosAvail = pub.filter(c => c.restrict !== "no visionOS" && c.vos !== null); const vosOnly = pub.filter(c => c.restrict === "visionOS"); const noVos = pub.filter(c => c.restrict === "no visionOS"); const rcpExposed = pub.filter(c => c.rcp); const rcpHidden = pub.filter(c => !c.rcp); return { components, counts: { total: pub.length, // 61 iosAvailable: iosAvail.length, // effectively available on iOS vosAvailable: vosAvail.length, // effectively available on visionOS visionOSOnly: vosOnly.length, // 5 (Docking, Manipulation, HitTarget, EnvBlending, ImagePresentation) noVisionOS: noVos.length, // 1 (BodyTracking) rcpExposed: rcpExposed.length, // 28 rcpHidden: rcpHidden.length, // 33 rcpCoveragePercent: Math.round(rcpExposed.length / pub.length * 100), }, // Era breakdown eras: { "Original (iOS 13–14)": pub.filter(c => c.era === "Original").length, "iOS 15–17": pub.filter(c => ["iOS 15","iOS 17"].includes(c.era)).length, "visionOS 1 (iOS 18)": pub.filter(c => c.era === "visionOS 1").length, "visionOS 2 (iOS 18)": pub.filter(c => c.era === "visionOS 2").length, "26.0 (2025)": pub.filter(c => c.era === "26.0").length, }, rcpExposed, rcpHidden, vosOnly, noVos, }; }32:T637,Plot.plot({ title: "The Platform Parity Illusion", subtitle: "All 61 types declared in every SDK, but @available tells the real story", width: 700, height: 260, marginLeft: 120, marginRight: 40, x: { label: "Component types", domain: [0, 65] }, y: { label: null, padding: 0.3 }, color: { domain: ["Cross-platform", "visionOS-only", "Not on visionOS"], range: [palette.shared, palette.vosOnly, palette.noVos], legend: true }, marks: [ Plot.barX( [ { platform: "Declared in SDK", type: "Cross-platform", count: data.counts.total }, { platform: "Available on iOS", type: "Cross-platform", count: data.counts.total - data.counts.visionOSOnly }, { platform: "Available on visionOS", type: "Cross-platform", count: data.counts.total - data.counts.noVisionOS - data.counts.visionOSOnly }, { platform: "Available on visionOS", type: "visionOS-only", count: data.counts.visionOSOnly }, { platform: "Available on iOS", type: "Not on visionOS", count: data.counts.noVisionOS }, ], { x: "count", y: "platform", fill: "type", tip: true } ), Plot.text([ { platform: "Declared in SDK", x: data.counts.total }, { platform: "Available on iOS", x: data.counts.total - data.counts.visionOSOnly + data.counts.noVisionOS }, { platform: "Available on visionOS", x: data.counts.total - data.counts.noVisionOS }, ], { x: "x", y: "platform", text: d => String(d.x), dx: 14, fontWeight: "bold" }), Plot.ruleX([0]) ], style: { fontSize: 13 } })33:T5a7,{ // Sort: RCP-exposed first, then not-exposed, alphabetical within each group const sorted = [ ...data.rcpExposed.sort((a,b) => a.name.localeCompare(b.name)), ...data.rcpHidden.sort((a,b) => a.name.localeCompare(b.name)) ]; const cols = 10; return Plot.plot({ title: `RCP Coverage: ${data.counts.rcpExposed} of ${data.counts.total} (${data.counts.rcpCoveragePercent}%)`, subtitle: "Each square = one public Component type. Hover for name.", width: 660, height: 320, marginTop: 40, marginLeft: 10, marginRight: 10, x: { label: null, axis: null }, y: { label: null, axis: null }, color: { domain: [`In RCP (${data.counts.rcpExposed})`, `Not in RCP (${data.counts.rcpHidden})`], range: [palette.rcpExposed, palette.rcpHidden], legend: true }, marks: [ Plot.cell( sorted.map((c, i) => ({ x: i % cols, y: Math.floor(i / cols), status: c.rcp ? `In RCP (${data.counts.rcpExposed})` : `Not in RCP (${data.counts.rcpHidden})`, name: c.name, platform: c.restrict || "All platforms" })), { x: "x", y: "y", fill: "status", inset: 2, rx: 4, tip: { format: { x: false, y: false }, channels: { Component: "name", Platform: "platform" } } } ) ], style: { fontSize: 13 } }); }34:T59d,{ const cats = {}; for (const c of data.components) { if (!cats[c.cat]) cats[c.cat] = { exposed: 0, hidden: 0, total: 0 }; cats[c.cat].total++; c.rcp ? cats[c.cat].exposed++ : cats[c.cat].hidden++; } const rows = []; for (const [cat, v] of Object.entries(cats)) { rows.push({ category: cat, status: "In RCP", count: v.exposed }); rows.push({ category: cat, status: "Not in RCP", count: v.hidden }); } return Plot.plot({ title: "RCP Coverage by Functional Category", subtitle: "Audio: 100% · Lighting: 82% · Camera: 0%", width: 700, height: 400, marginLeft: 110, marginRight: 80, x: { label: "Components", domain: [0, 12] }, y: { label: null, padding: 0.2 }, color: { domain: ["In RCP", "Not in RCP"], range: [palette.rcpExposed, palette.rcpHidden], legend: true }, marks: [ Plot.barX(rows, { x: "count", y: "category", fill: "status", tip: true, sort: { y: "-x" } }), // Percentage annotations Plot.text( Object.entries(cats).map(([cat, v]) => ({ category: cat, total: v.total, pct: Math.round(v.exposed / v.total * 100) })), { x: "total", y: "category", text: d => `${d.pct}%`, dx: 16, fill: palette.muted, fontSize: 11 } ), Plot.ruleX([0]) ], style: { fontSize: 13 } }); } 35:T659, Plot.plot({ title: "Brand New in 26.0 (2025)", subtitle: "6 components added this year — most are interaction-focused", width: 660, height: 220, marginLeft: 260, marginRight: 120, x: { label: null, axis: null, domain: [0, 1] }, y: { label: null, padding: 0.15 }, marks: [ Plot.barX( data.components .filter(c => c.era === "26.0") .map(c => ({ name: c.name, value: 1, platform: c.restrict || "Cross-platform", inRCP: c.rcp ? "Yes" : "No" })), { x: "value", y: "name", fill: d => d.platform === "visionOS" ? palette.vosOnly : palette.era26, tip: { format: { x: false, value: false }, channels: { Platform: "platform", "In RCP": "inRCP" } } } ), Plot.text( data.components .filter(c => c.era === "26.0") .map(c => ({ name: c.name, label: c.restrict === "visionOS" ? "visionOS only" : "All platforms" })), { x: () => 1, y: "name", text: "label", dx: 8, textAnchor: "start", fill: d => d.label.includes("visionOS") ? palette.vosOnly : palette.muted, fontSize: 11 } ), ], style: { fontSize: 13 } })36:T7fe,{ const w = 740, h = 200; const barY = 90, barH = 50; const exposed = data.counts.rcpExposed; const total = data.counts.total; const hidden = total - exposed; const barLeft = 80, barRight = w - 40; const barW = barRight - barLeft; const splitX = barLeft + (exposed / total) * barW; return htl.svg``; }37:T638,

This notebook is part of the Deconstructed series

Building an open-code Reality Composer Pro clone—and documenting all we learn about OpenUSD, MaterialX, RealityKit, etc... along the way.

Follow the series → GitHub

38:[] 2f:{"id":"4e1ffd6d2df015f9","slug":null,"title":"Reality Composer Pro × RealityKit","thumbnail":"8fe16027f6980f5dd6be09078969627e88e076f6d6355604bd5c7fa969190871","access_level":"public","create_time":"$D2026-02-17T11:03:13.643Z","update_time":"$D2026-02-17T11:51:21.922Z","view_time":null,"first_public_time":"$D2026-02-17T11:26:30.095Z","has_unpublished_edits":null,"fork":false,"stars":1,"starred":false,"owner":{"type":"team","id":"9e90c3b807ebdc20","login":"elkraneo-ws","name":"elkraneo's Workspace","avatar_url":"https://avatars-next.observableusercontent.com/fe785a186e88f1ef66f18009b1b35c1e1ba57f5d57d71c9509d05254444fb421","tier":"starter_2024","bio":""},"version":81,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"2b8b21ede1cf2f9e","login":"elkraneo","name":"elkraneo","avatar_url":"https://avatars-next.observableusercontent.com/327841b0dda1fa39ef6fc8d52960ad58567b9bc33b7508c4d6198b60a0fb1441","tier":null,"bio":""}],"members":[{"type":"individual","id":"2b8b21ede1cf2f9e","login":"elkraneo","name":"elkraneo","avatar_url":"https://avatars-next.observableusercontent.com/327841b0dda1fa39ef6fc8d52960ad58567b9bc33b7508c4d6198b60a0fb1441","tier":null,"role":"editor"},{"type":"team","id":"9e90c3b807ebdc20","login":"elkraneo-ws","name":"elkraneo's Workspace","avatar_url":"https://avatars-next.observableusercontent.com/fe785a186e88f1ef66f18009b1b35c1e1ba57f5d57d71c9509d05254444fb421","tier":"starter_2024","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Reality Composer Pro × RealityKit","cells":[{"id":0,"value":"# Reality Composer Pro × RealityKit\n## Component Coverage Across Platforms\n\nAn exploration of which `RealityFoundation.Component` types ship in each SDK,\nwhat's truly shared vs platform-exclusive, and what Reality Composer Pro\nactually exposes in its Add Component menu.\n\n*Data extracted from Xcode 26.3 RC `.swiftinterface` files and RCP framework binaries.*","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":12,"value":"$31","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":14,"value":"palette = ({\n ios: \"#007AFF\",\n visionOS: \"#AF52DE\",\n macOS: \"#FF9F0A\",\n shared: \"#5856D6\",\n rcpExposed: \"#34C759\",\n rcpHidden: \"#C7C7CC\",\n vosOnly: \"#AF52DE\",\n noVos: \"#FF3B30\",\n newIn26: \"#FF9F0A\",\n bg: \"#FFFFFF\",\n text: \"#1D1D1F\",\n muted: \"#86868B\",\n // Era colors\n eraOriginal: \"#8E8E93\",\n eraV1: \"#5856D6\",\n eraV2: \"#007AFF\",\n era26: \"#FF9F0A\",\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":18,"value":"## 1. The Component Surface: Bigger Than You Think\nRealityFoundation ships **61 public `Component` types** — not the ~40 most\ndevelopers could name off the top of their head. This includes nested types like\n`DirectionalLightComponent.Shadow` and `ManipulationComponent.HitTarget`\nthat are easy to overlook.\nThe type surface is **identical across iOS, visionOS, and macOS** at the\ndeclaration level — all 61 types appear in every SDK's `.swiftinterface`.\nBut `@available` annotations tell a different story.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":20,"value":"$32","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":23,"value":"### Platform Exclusives\n**visionOS-only** (unavailable on iOS/macOS):\n- `DockingRegionComponent` — spatial window docking (visionOS 2.0+)\n- `ManipulationComponent` + `HitTarget` — direct manipulation (26.0)\n- `EnvironmentBlendingComponent` — passthrough blending (26.0)\n- `ImagePresentationComponent` — 3D image display (26.0)\n**Not on visionOS**: `BodyTrackingComponent` (iOS/macOS only — ARKit body tracking)\n**Not on macOS**: `SceneUnderstandingComponent` (iOS + visionOS only)\nThis means a visionOS developer has access to **5 components** that simply\ndon't exist on iOS, while iOS has **1** that visionOS lacks.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":27,"value":"## 2. The ECS Growth Story\nRealityKit launched in 2019 with ~12 components. The visionOS era (2023–2024)\nnearly **tripled** the component surface. And 2025 adds another wave.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":29,"value":"Plot.plot({\n title: \"Component Growth by SDK Era\",\n subtitle: \"From 12 original types to 61 in four years\",\n width: 700,\n height: 280,\n marginLeft: 170,\n marginRight: 60,\n x: { label: \"Number of component types\", domain: [0, 25] },\n y: { label: null, padding: 0.25 },\n color: {\n domain: Object.keys(data.eras),\n range: [palette.eraOriginal, \"#98989D\", palette.eraV1, palette.eraV2, palette.era26],\n legend: false\n },\n marks: [\n Plot.barX(\n Object.entries(data.eras).map(([era, count]) => ({ era, count })),\n {\n x: \"count\",\n y: \"era\",\n fill: \"era\",\n tip: true,\n sort: { y: null }\n }\n ),\n Plot.text(\n Object.entries(data.eras).map(([era, count]) => ({ era, count })),\n {\n x: \"count\", y: \"era\",\n text: d => String(d.count),\n dx: 12, fontWeight: \"bold\", fill: palette.text\n }\n ),\n Plot.ruleX([0])\n ],\n style: { fontSize: 13 }\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":31,"value":"## 3. What RCP Actually Exposes\nReality Composer Pro's \"Add Component\" menu maps to **28 of 61** public\nRealityKit component types — **46% coverage**, not 50%.\nAll 28 are real `RealityKit.*` identifiers. Despite earlier claims,\nthere are **no RCP-specific component types** (no `RCP.BehaviorsContainer`).\nThe menu has 28 components + 1 \"New Component\" action = **29 rows total**.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":33,"value":"$33","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":35,"value":"## 4. Coverage by Category: Where RCP Shines (and Doesn't)\nRCP's coverage is uneven. **Audio is at 100%** — every audio component is\nexposed. **Lighting is at 82%**. But **Cameras are at 0%**, and the new\n**Interaction** components are mostly uncovered.\nSome omissions are by design: `Transform` and `ModelComponent` aren't in the\nmenu because they're implicit (every entity has a transform; models come\nfrom asset drag-and-drop). Similarly, `VideoPlayerComponent` and `PortalComponent`\nare added via entity creation templates, not the component inspector.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":37,"value":"$34","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":39,"value":"## 5. The \"Implicit vs Explicit\" Design Choice \n \n Why are some fundamental components missing from RCP's menu? \n Because RCP uses **entity templates** for certain component types:","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":65,"value":"Inputs.table(\n [\n { Component: \"Transform\", \"How RCP handles it\": \"Every entity always has one\" },\n { Component: \"ModelComponent\", \"How RCP handles it\": \"Drag a .usdz asset into the scene\" },\n { Component: \"VideoPlayerComponent\", \"How RCP handles it\": \"Add Entity → Video template\" },\n { Component: \"PortalComponent\", \"How RCP handles it\": \"Add Entity → Portal template\" },\n { Component: \"TextComponent\", \"How RCP handles it\": \"Add Entity → Text template\" },\n { Component: \"PerspectiveCameraComponent\", \"How RCP handles it\": \"Add Entity → Camera template\" },\n ],\n {\n columns: [\"Component\", \"How RCP handles it\"],\n width: { Component: 260, \"How RCP handles it\": 340 },\n sort: false,\n }\n )","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":67,"value":"These aren't \"missing\" — they're exposed through a **different UX surface**.\nThe Add Component menu is for *decorating* an existing entity, not creating one.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":41,"value":"## 6. The visionOS Exclusives RCP Exposes\nHere's a subtlety: RCP's component menu includes **`DockingRegionComponent`**,\nwhich is **visionOS-only** (`@available(visionOS 2.0, *)`). Since RCP runs on\nmacOS but targets visionOS content, it exposes platform-exclusive components\nthat can't even run on the host machine.\nMeanwhile, `SceneUnderstandingComponent` (in RCP) is unavailable on macOS —\nanother case of RCP authoring for target platforms it doesn't run on.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":43,"value":"$35","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":45,"value":"## 7. Key Takeaways\n1. **61 public component types** in RealityFoundation — more than most realize\n2. **Platform parity is an illusion**: 5 visionOS-only, 1 iOS-only, despite identical type declarations\n3. **RCP covers 46%** (28/61), not 50% — and the gap is intentional\n4. **Audio: 100% covered** in RCP. Camera: 0%. Physics: partial\n5. **6 new components in 26.0**, mostly interaction-focused, none yet in RCP\n6. **visionOS drove 75% of the growth** — the component surface nearly tripled since 2023\n7. **Implicit ≠ missing**: Transform, Model, Video, etc. are exposed via entity templates\n8. **RCP authors for visionOS from macOS** — it exposes components unavailable on its own platform","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":47,"value":"$36","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":49,"value":"Inputs.table(\n data.components\n .map(c => ({\n Component: c.name,\n Category: c.cat,\n \"In RCP\": c.rcp ? \"Yes\" : \"—\",\n \"iOS\": c.ios || \"—\",\n \"visionOS\": c.vos || \"—\",\n \"Restriction\": c.restrict || \"\",\n \"Era\": c.era,\n }))\n .sort((a, b) => a.Component.localeCompare(b.Component)),\n {\n columns: [\"Component\", \"Category\", \"In RCP\", \"iOS\", \"visionOS\", \"Restriction\", \"Era\"],\n header: {\n Component: \"Component Type\",\n \"In RCP\": \"RCP?\",\n \"iOS\": \"iOS\",\n \"visionOS\": \"visionOS\",\n },\n width: {\n Component: 280,\n Category: 100,\n \"In RCP\": 50,\n \"iOS\": 50,\n \"visionOS\": 70,\n Restriction: 100,\n Era: 100,\n },\n sort: \"Component\",\n }\n)","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":73,"value":"$37","pinned":false,"hidden":false,"mode":"html","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"}],"files":"$W38","stdlib":"1"}} 30:"$2f:body"