feat: add physical camera marker on 3D court (1m from net, center, 1m height)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/web/templates/index.html

@@ -506,6 +506,9 @@ function initCourtScene() {
 
     courtScene.add(new THREE.AmbientLight(0xffffff, 0.8));
 
+    // Physical camera marker: 1m from net, center, 1m height
+    addCameraMarker(courtScene, 7.7, 3.05, 1);
+
     // Load existing calibration cameras
     fetch('/api/calibration/data')
         .then(function(r) { return r.json(); })
@@ -604,6 +607,9 @@ function initTrajectoryScene() {
 
     trajScene.add(new THREE.AmbientLight(0xffffff, 0.8));
 
+    // Physical camera marker: 1m from net, center, 1m height
+    addCameraMarker(trajScene, 7.7, 3.05, 1);
+
     function animateTraj() {
         requestAnimationFrame(animateTraj);
         controls.update();
@@ -620,6 +626,33 @@ function initTrajectoryScene() {
     });
 }
 
+// ===================== Camera marker =====================
+function addCameraMarker(scene, x, y, z) {
+    // Camera body (box)
+    var body = new THREE.Mesh(
+        new THREE.BoxGeometry(0.2, 0.15, 0.15),
+        new THREE.MeshBasicMaterial({ color: 0x44aaff })
+    );
+    body.position.set(x, y, z);
+    scene.add(body);
+
+    // Lens (cone pointing toward net at x=6.7)
+    var lens = new THREE.Mesh(
+        new THREE.ConeGeometry(0.06, 0.15, 8),
+        new THREE.MeshBasicMaterial({ color: 0x2288dd })
+    );
+    lens.rotation.z = Math.PI / 2; // point along -X toward net
+    lens.position.set(x - 0.17, y, z);
+    scene.add(lens);
+
+    // Pole from ground to camera
+    var poleGeo = new THREE.BufferGeometry().setFromPoints([
+        new THREE.Vector3(x, y, 0),
+        new THREE.Vector3(x, y, z)
+    ]);
+    scene.add(new THREE.Line(poleGeo, new THREE.LineBasicMaterial({ color: 0x666666 })));
+}
+
 // ===================== Draw court lines =====================
 function drawCourtLines(scene) {
     var mat = new THREE.LineBasicMaterial({ color: 0xffffff });