viewer: Pan + ZoomExtents + 표준 뷰 단축키

camera.rs:
- pan(dx, dy): Shift+중간버튼으로 target 이동 (화면 평면 이동)
- zoom_extents(mn, mx): E키로 전체 씬 맞춤
- set_standard_view(StandardView): 축 고정 뷰
- StandardView: Top(7) / Front(1) / Right(3) / Left(4) / Iso(Home)

lib.rs:
- shift_pressed 추적 (ModifiersChanged)
- Shift+중간버튼 드래그 → pan
- E → ZoomExtents
- 1/3/4/7/Home → 표준 뷰 스냅
- scene_mn/mx 저장 → zoom_extents에 전달

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cimery/crates/viewer/src/camera.rs

@@ -22,6 +22,16 @@ impl CameraUniform {
 
 // ─── Camera ──────────────────────────────────────────────────────────────────
 
+/// Standard axis-aligned views (Revit numpad convention).
+#[derive(Debug, Clone, Copy)]
+pub enum StandardView {
+    Top,    // Numpad 7
+    Front,  // Numpad 1
+    Right,  // Numpad 3
+    Left,   // Numpad 4 / Ctrl+Numpad3
+    Iso,    // Home
+}
+
 /// Orbit camera — spherical coordinates around a fixed target point.
 ///
 /// All distances in millimetres (scene units).
@@ -94,6 +104,42 @@ impl Camera {
         self.radius = (self.radius * (1.0 - delta * 0.1)).max(100.0);
     }
 
+    /// Pan target by screen-space delta (Shift + middle mouse).
+    ///
+    /// Moves the orbit centre so the object stays under the cursor.
+    pub fn pan(&mut self, delta_x: f32, delta_y: f32) {
+        let eye      = self.eye();
+        let view_dir = (self.target - eye).normalize();
+        let right    = view_dir.cross(Vec3::Y).normalize();
+        let up       = right.cross(view_dir).normalize();
+        let scale    = self.radius * 0.001;   // pan speed proportional to zoom
+        self.target -= right * delta_x * scale;
+        self.target += up   * delta_y * scale;
+    }
+
+    /// Zoom-extents: fit the given bounding box into view.
+    pub fn zoom_extents(&mut self, mn: [f32; 3], mx: [f32; 3]) {
+        let c = Vec3::new(
+            (mn[0] + mx[0]) * 0.5,
+            (mn[1] + mx[1]) * 0.5,
+            (mn[2] + mx[2]) * 0.5,
+        );
+        let diag = Vec3::new(mx[0]-mn[0], mx[1]-mn[1], mx[2]-mn[2]).length();
+        self.target = c;
+        self.radius = (diag * 0.75).max(1000.0);
+    }
+
+    /// Snap to a standard axis-aligned view (Revit numpad convention).
+    pub fn set_standard_view(&mut self, view: StandardView) {
+        match view {
+            StandardView::Top   => { self.yaw = 0.0;  self.pitch =  std::f32::consts::FRAC_PI_2 - 0.01; }
+            StandardView::Front => { self.yaw = std::f32::consts::PI; self.pitch = 0.0; }
+            StandardView::Right => { self.yaw = std::f32::consts::FRAC_PI_2; self.pitch = 0.0; }
+            StandardView::Left  => { self.yaw = -std::f32::consts::FRAC_PI_2; self.pitch = 0.0; }
+            StandardView::Iso   => { self.yaw = std::f32::consts::FRAC_PI_4; self.pitch = 0.35; }
+        }
+    }
+
     /// Update aspect ratio on window resize.
     pub fn resize(&mut self, width: u32, height: u32) {
         self.aspect = width as f32 / height.max(1) as f32;

cimery/crates/viewer/src/lib.rs

@@ -31,7 +31,7 @@ use cimery_kernel::OcctKernel;
 #[cfg(not(feature = "occt"))]
 use cimery_kernel::PureRustKernel;
 use cimery_kernel::GeomKernel;
-use camera::Camera;
+use camera::{Camera, StandardView};
 use glam;
 
 // ─── Vertex ───────────────────────────────────────────────────────────────────
@@ -80,9 +80,13 @@ struct RenderState {
     camera_bind_group: wgpu::BindGroup,
     // Depth
     depth_view:       wgpu::TextureView,
-    // Mouse state
+    // Mouse / keyboard state
     mid_pressed:  bool,
+    shift_pressed: bool,
     last_mouse:   winit::dpi::PhysicalPosition<f64>,
+    // Scene extents for ZoomExtents
+    scene_mn:     [f32; 3],
+    scene_mx:     [f32; 3],
 }
 
 impl RenderState {
@@ -271,6 +275,8 @@ impl RenderState {
             cache:     None,
         });
 
+        let (scene_mn, scene_mx) = bridge_scene::scene_extents();
+
         RenderState {
             window,
             device,
@@ -286,7 +292,10 @@ impl RenderState {
             camera_bind_group,
             depth_view,
             mid_pressed:   false,
+            shift_pressed: false,
             last_mouse:    winit::dpi::PhysicalPosition { x: 0.0, y: 0.0 },
+            scene_mn,
+            scene_mx,
         }
     }
 
@@ -416,16 +425,56 @@ impl ApplicationHandler for CimeryApp {
         match event {
             // ── Exit ──────────────────────────────────────────────────────────
             WindowEvent::CloseRequested => event_loop.exit(),
-            WindowEvent::KeyboardInput {
+
-                event: KeyEvent {
+            // ── Shift modifier tracking ───────────────────────────────────────
-                    physical_key: PhysicalKey::Code(KeyCode::Escape), ..
+            WindowEvent::ModifiersChanged(mods) => {
-                }, ..
+                state.shift_pressed = mods.state().shift_key();
-            } => event_loop.exit(),
+            }
+
+            // ── Keyboard shortcuts ────────────────────────────────────────────
+            WindowEvent::KeyboardInput { event: KeyEvent { physical_key, state: key_state, .. }, .. }
+                if key_state == ElementState::Pressed =>
+            {
+                match physical_key {
+                    PhysicalKey::Code(KeyCode::Escape) => event_loop.exit(),
+                    // E → ZoomExtents (fit all)
+                    PhysicalKey::Code(KeyCode::KeyE) => {
+                        state.camera.zoom_extents(state.scene_mn, state.scene_mx);
+                        state.update_camera();
+                    }
+                    // Numpad 7 / 7 → Top view
+                    PhysicalKey::Code(KeyCode::Numpad7) | PhysicalKey::Code(KeyCode::Digit7) => {
+                        state.camera.set_standard_view(StandardView::Top);
+                        state.update_camera();
+                    }
+                    // Numpad 1 / 1 → Front view
+                    PhysicalKey::Code(KeyCode::Numpad1) | PhysicalKey::Code(KeyCode::Digit1) => {
+                        state.camera.set_standard_view(StandardView::Front);
+                        state.update_camera();
+                    }
+                    // Numpad 3 / 3 → Right side view
+                    PhysicalKey::Code(KeyCode::Numpad3) | PhysicalKey::Code(KeyCode::Digit3) => {
+                        state.camera.set_standard_view(StandardView::Right);
+                        state.update_camera();
+                    }
+                    // Numpad 4 / 4 → Left side view
+                    PhysicalKey::Code(KeyCode::Numpad4) | PhysicalKey::Code(KeyCode::Digit4) => {
+                        state.camera.set_standard_view(StandardView::Left);
+                        state.update_camera();
+                    }
+                    // Home → Isometric (default view)
+                    PhysicalKey::Code(KeyCode::Home) => {
+                        state.camera.set_standard_view(StandardView::Iso);
+                        state.update_camera();
+                    }
+                    _ => {}
+                }
+            }
 
             // ── Resize ────────────────────────────────────────────────────────
             WindowEvent::Resized(sz) => state.resize(sz),
 
-            // ── Mouse orbit (middle button drag) ──────────────────────────────
+            // ── Mouse orbit / pan (middle button drag) ────────────────────────
             WindowEvent::MouseInput { button: MouseButton::Middle, state: btn_state, .. } => {
                 state.mid_pressed = btn_state == ElementState::Pressed;
             }
@@ -433,7 +482,13 @@ impl ApplicationHandler for CimeryApp {
                 if state.mid_pressed {
                     let dx = (position.x - state.last_mouse.x) as f32;
                     let dy = (position.y - state.last_mouse.y) as f32;
+                    if state.shift_pressed {
+                        // Shift + Middle = Pan (translate target)
+                        state.camera.pan(dx, dy);
+                    } else {
+                        // Middle = Orbit
                         state.camera.orbit(dx, dy);
+                    }
                     state.update_camera();
                 }
                 state.last_mouse = position;