diff --git a/avlivebody-mac/Sources/AVLiveBody/RenderSettings.swift b/avlivebody-mac/Sources/AVLiveBody/RenderSettings.swift
new file mode 100644
index 0000000..3cc821e
--- /dev/null
+++ b/avlivebody-mac/Sources/AVLiveBody/RenderSettings.swift
@@ -0,0 +1,31 @@
+// avlivebody-mac/Sources/AVLiveBody/RenderSettings.swift
+import SwiftUI
+
+/// Live visual settings for AVLiveBody. ContentView observes this and
+/// pushes changes to SceneController. Defaults chosen so the scene is
+/// lit and everything visible out of the box.
+@MainActor
+final class RenderSettings: ObservableObject {
+    // Layer visibility
+    @Published var showSkeleton: Bool = true
+    @Published var showMesh: Bool = true
+    @Published var showVideo: Bool = true
+
+    // Mesh material
+    @Published var meshMetallic: Bool = false
+    @Published var meshRoughness: Double = 0.6
+
+    // Video quad
+    @Published var videoOpacity: Double = 1.0
+
+    // Lights (RealityKit DirectionalLight intensities)
+    @Published var keyIntensity: Double = 4000
+    @Published var fillIntensity: Double = 1500
+    @Published var rimIntensity: Double = 2000
+
+    // Camera
+    @Published var fieldOfView: Double = 55
+
+    // Panel visibility
+    @Published var showPanel: Bool = false
+}
diff --git a/avlivebody-mac/Tests/AVLiveBodyTests/RenderSettingsTests.swift b/avlivebody-mac/Tests/AVLiveBodyTests/RenderSettingsTests.swift
new file mode 100644
index 0000000..ac9dcd4
--- /dev/null
+++ b/avlivebody-mac/Tests/AVLiveBodyTests/RenderSettingsTests.swift
@@ -0,0 +1,21 @@
+// avlivebody-mac/Tests/AVLiveBodyTests/RenderSettingsTests.swift
+import XCTest
+@testable import AVLiveBody
+
+@MainActor
+final class RenderSettingsTests: XCTestCase {
+    func testDefaults() {
+        let s = RenderSettings()
+        XCTAssertTrue(s.showSkeleton)
+        XCTAssertTrue(s.showMesh)
+        XCTAssertTrue(s.showVideo)
+        XCTAssertFalse(s.meshMetallic)
+        XCTAssertEqual(s.meshRoughness, 0.6, accuracy: 1e-9)
+        XCTAssertEqual(s.videoOpacity, 1.0, accuracy: 1e-9)
+        XCTAssertEqual(s.keyIntensity, 4000, accuracy: 1e-9)
+        XCTAssertEqual(s.fillIntensity, 1500, accuracy: 1e-9)
+        XCTAssertEqual(s.rimIntensity, 2000, accuracy: 1e-9)
+        XCTAssertEqual(s.fieldOfView, 55, accuracy: 1e-9)
+        XCTAssertFalse(s.showPanel)
+    }
+}