diff --git a/PENDENZEN.md b/PENDENZEN.md
index cd5d2e0..8f69d50 100644
--- a/PENDENZEN.md
+++ b/PENDENZEN.md
@@ -18,6 +18,10 @@
 
 ---
 
+## 📅 Geplant
+
+- [ ] **truck-Integration (Profil-Extrusion / B-Rep)** — **Start: 2026-07-07 (Dienstag, nach Reset).** Nutzer zeichnet 2D-Querschnitt (L-Profil, T-Träger, Freiform) → truck-Extrusion → 3D-Körper + Boolean gegen Wand/Decke. Voraussetzung: truck-Booleans stabil + WASM-Integration. Umfang: ~4–6 Wochen. Mit Nutzer Scope/MVP klären vor Start.
+
 ## ⛔ Blocker (zuerst klären)
 
 - [x] ~~**Toolchain prüfen**~~ — **ERLEDIGT 2026-07-04 (macOS-Gerät):** `node`/`npm`/`cargo` (1.96.0)/`wasm-pack` (0.15.0) alle vorhanden. `npm install` + `npm approve-scripts esbuild wasm-pack …` (npm gated Install-Scripts → `allowScripts`-Block in `package.json`, ungetrackt gelassen), `rustup target add wasm32-unknown-unknown`, beide WASM-Engines gebaut, Frontend gebaut, **`npm run tauri:build` → Mac-App (`cad.app` + `cad_0.1.0_aarch64.dmg`, arm64) läuft.** Verifikations-Baseline grün: `tsc --noEmit` sauber, `vitest run` 230/230, `cargo test render3d` 56/56. **Kein Blocker mehr für Engine-Slices auf diesem Gerät.**
diff --git a/src/App.tsx b/src/App.tsx
index c6eb0a4..77ec77f 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -69,7 +69,7 @@ import type { Pick3dHit } from "./viewport/Wasm3DViewport";
 import { ResourceManager } from "./ui/ResourceManager";
 import type { ResourceManagerHandlers } from "./ui/ResourceManager";
 import { HatchSwatch } from "./ui/hatchPreview";
-import { TopBar, ViewRibbonTab } from "./ui/TopBar";
+import { TopBar, ViewRibbonTab, Ribbon3dTab } from "./ui/TopBar";
 import { RibbonBar } from "./ui/ribbon/RibbonBar";
 import type { RibbonTabId } from "./ui/ribbon/ribbonItems";
 import { Dropdown } from "./ui/Dropdown";
@@ -3320,6 +3320,20 @@ export default function App() {
             textTarget={textTarget}
           />
           ),
+          "3d": (
+            <Ribbon3dTab
+              viewToggleEnabled={activeLevel.kind === "floor"}
+              viewType={viewType}
+              onViewType={setViewType}
+              view3d={view3d}
+              onView3d={setView3d}
+              fov={fov}
+              onFov={setFov}
+              renderMode={renderMode}
+              onRenderMode={setRenderMode}
+              renderModeEnabled={viewType === "perspektive"}
+            />
+          ),
         }}
       />
 
diff --git a/src/ui/TopBar.tsx b/src/ui/TopBar.tsx
index 62ead48..9be63af 100644
--- a/src/ui/TopBar.tsx
+++ b/src/ui/TopBar.tsx
@@ -1262,6 +1262,99 @@ export function ViewRibbonTab({
   );
 }
 
+export interface Ribbon3dTabProps {
+  viewToggleEnabled: boolean;
+  viewType: ViewType;
+  onViewType: (v: ViewType) => void;
+  view3d: View3d;
+  onView3d: (v: View3d) => void;
+  fov: number;
+  onFov: (n: number) => void;
+  renderMode: RenderMode;
+  onRenderMode: (m: RenderMode) => void;
+  renderModeEnabled: boolean;
+}
+
+/** 3D-Tab des Ribbons — Kamera-Presets + Darstellungsart. Kein Duplikat des
+ *  Ansichten-Tabs: hier nur 3D-relevante Steuerung (Blickwinkel, Rendermodus). */
+export function Ribbon3dTab({
+  viewToggleEnabled,
+  viewType,
+  onViewType,
+  view3d,
+  onView3d,
+  fov,
+  onFov,
+  renderMode,
+  onRenderMode,
+  renderModeEnabled,
+}: Ribbon3dTabProps) {
+  return (
+    <div className="ribbon-views">
+      <div className="tb-group" role="group" aria-label={t("topbar.viewGroup")}>
+        <div className="view-grid view-grid-4">
+          <button
+            className={`view-icon${viewToggleEnabled && viewType === "grundriss" ? " active" : ""}`}
+            onClick={() => onViewType("grundriss")}
+            disabled={!viewToggleEnabled}
+            title={viewToggleEnabled ? t("topbar.grundriss") : t("topbar.viewGroup.disabled")}
+            aria-label={t("topbar.grundriss")}
+          >
+            <ViewIcon name="grundriss" />
+          </button>
+          {(
+            [
+              ["top", t("view3d.top")],
+              ["iso", t("view3d.iso")],
+              ["perspective", t("view3d.perspective")],
+              ["front", t("view3d.front")],
+              ["side", t("view3d.side")],
+            ] as [View3d, string][]
+          ).map(([key, label]) => (
+            <button
+              key={key}
+              className={`view-icon${viewToggleEnabled && viewType === "perspektive" && view3d === key ? " active" : ""}`}
+              onClick={() => {
+                onView3d(key);
+                if (viewType !== "perspektive") onViewType("perspektive");
+              }}
+              disabled={!viewToggleEnabled}
+              title={viewToggleEnabled ? `${label} — ${t(`view3d.${key}.hint`)}` : t("topbar.viewGroup.disabled")}
+              aria-label={label}
+            >
+              <ViewIcon name={key} />
+            </button>
+          ))}
+          <CameraMenu
+            fov={fov}
+            onFov={onFov}
+            disabled={!viewToggleEnabled || viewType !== "perspektive"}
+          />
+        </div>
+      </div>
+      <Sep />
+      <div className="tb-group" role="group" aria-label={t("display.style.group")}>
+        <label className="tb-field">
+          <span className="tb-label">{t("display.style")}</span>
+          <Dropdown
+            value={renderMode}
+            disabled={!renderModeEnabled}
+            onChange={(v) => onRenderMode(v as RenderMode)}
+            title={t("display.style.hint")}
+            options={[
+              { value: "shaded", label: t("display.style.shaded") },
+              { value: "white", label: t("display.style.white") },
+              { value: "textured", label: t("display.style.textured") },
+              { value: "wireframe", label: t("display.style.wireframe") },
+              { value: "hidden", label: t("display.style.hidden") },
+            ]}
+          />
+        </label>
+      </div>
+    </div>
+  );
+}
+
 export function TopBar({
   project,
   ribbonTab,