add predefined scenes

public/ar_start.js

@@ -8,13 +8,38 @@ let sceneFileName = null;
 let startButton = null;
 let loadButton = null;
 
+let predefinedButton1 = null;
+let predefinedButton2 = null;
+
+/* ========================= */
+/*   PREDEFINED SCENE        */
+/* ========================= */
+
+async function loadPredefinedScene(filePath, fileName) {
+  try {
+    const response = await fetch(filePath);
+    const data = await response.json();
+
+    sceneData = data;
+    sceneFileName = fileName;
+
+    console.log("Vordefinierte Szene geladen:", fileName);
+
+  } catch (error) {
+    console.error(
+      "Fehler beim Laden der vordefinierten Szene:",
+      error
+    );
+  }
+}
+
 /* ============================================================ */
 /* Create the Start AR / Load Scene buttons                     */
 /* ============================================================ */
 
 function showStartScreen() {
   // Prevent duplicate buttons
-  if (startButton || loadButton) {
+  if (startButton || loadButton || predefinedButton1 || predefinedButton2) {
     return;
   }
 
@@ -58,18 +83,22 @@ function showStartScreen() {
   /*       START AR CLICK       */
   /* ========================= */
 
-  startButton.onclick = () => {
+startButton.onclick = () => {
   // Remove start-page buttons
   startButton.remove();
   loadButton.remove();
+  predefinedButton1.remove();
+  predefinedButton2.remove();
 
   // Reset references
   startButton = null;
   loadButton = null;
+  predefinedButton1 = null;
+  predefinedButton2 = null;
 
   // Start AR
   activateXR(sceneData);
-  };
+};
 
   /* ========================= */
   /*      LOAD SCENE CLICK     */
@@ -87,6 +116,59 @@ function showStartScreen() {
       }
     });
   };
+  /* ========================= */
+  /*   PREDEFINED SCENE 1      */
+  /* ========================= */
+
+  predefinedButton1 = document.createElement("button");
+
+  predefinedButton1.textContent = "Gengenbach Plaza";
+
+  predefinedButton1.style.cssText =
+    "position: fixed; " +
+    "top: 65%; " +
+    "left: 50%; " +
+    "transform: translate(-50%, -50%); " +
+    "padding: 15px; " +
+    "font-size: 18px;";
+
+  document.body.appendChild(predefinedButton1);
+
+  predefinedButton1.onclick = async () => {
+    await loadPredefinedScene(
+      "scenes/gengenbach-plaza.json",
+      "Gengenbach Plaza",
+    );
+
+    predefinedButton1.textContent = sceneFileName;
+  };
+
+  /* ========================= */
+  /*   PREDEFINED SCENE 2      */
+  /* ========================= */
+
+  predefinedButton2 = document.createElement("button");
+
+  predefinedButton2.textContent = "Gengenbach Street";
+
+  predefinedButton2.style.cssText =
+    "position: fixed; " +
+    "top: 75%; " +
+    "left: 50%; " +
+    "transform: translate(-50%, -50%); " +
+    "padding: 15px; " +
+    "font-size: 18px;";
+
+  document.body.appendChild(predefinedButton2);
+
+  predefinedButton2.onclick = async () => {
+    await loadPredefinedScene(
+      "scenes/gengenbach-street.json",
+      "Gengenbach Street",
+    );
+
+    predefinedButton2.textContent = sceneFileName;
+  };
 }
 
 /* ========================= */

public/scenes/gengenbach-plaza.json

+{
+ "lat": 48.77967,
+ "lng": 9.17353,
+ "models": [
+  {
+   "name": "Bench",
+   "position": {
+    "x": 0.5059653520584106,
+    "y": -1.046484351158142,
+    "z": -2.4857735633850098
+   },
+   "rotation": {
+    "_x": 0,
+    "_y": 4.363323129985823,
+    "_z": 0,
+    "_order": "XYZ"
+   },
+   "scale": {
+    "x": 0.428,
+    "y": 0.428,
+    "z": 0.428
+   },
+   "lat": 48.77964766991615,
+   "lng": 9.173536897518753
+  },
+  {
+   "name": "Lantern",
+   "position": {
+    "x": 0.39047476649284363,
+    "y": -1.0823711156845093,
+    "z": -1.7634316682815552
+   },
+   "rotation": {
+    "_x": 0,
+    "_y": 0,
+    "_z": 0,
+    "_order": "XYZ"
+   },
+   "scale": {
+    "x": 3.7520000000000002,
+    "y": 3.7520000000000002,
+    "z": 3.7520000000000002
+   },
+   "lat": 48.7796541588238,
+   "lng": 9.17353532310565
+  }
+ ]
+}
\ No newline at end of file

public/scenes/gengenbach-street.json

+{
+ "lat": 48.77966,
+ "lng": 9.17354,
+ "models": [
+  {
+   "name": "Bench",
+   "position": {
+    "x": -3.0674502849578857,
+    "y": -4.950973987579346,
+    "z": -5.41895055770874
+   },
+   "rotation": {
+    "_x": 0,
+    "_y": 0,
+    "_z": 0,
+    "_order": "XYZ"
+   },
+   "scale": {
+    "x": 0.5,
+    "y": 0.5,
+    "z": 0.5
+   },
+   "lat": 48.7796113207389,
+   "lng": 9.17349818331914
+  }
+ ]
+}
\ No newline at end of file