calculate and use frames per second in handle zoom func

CesiumGS · Sep 23, 2024 · 6712b1d · 6712b1d
1 parent b1c1963
commit 6712b1d
Showing 1 changed file with 12 additions and 1 deletion.
diff --git a/packages/engine/Source/Scene/ScreenSpaceCameraController.js b/packages/engine/Source/Scene/ScreenSpaceCameraController.js
@@ -573,7 +573,18 @@ function handleZoom(
   const maxHeight = object.maximumZoomDistance;
 
   const minDistance = distanceMeasure - minHeight;
-  let zoomRate = zoomFactor * minDistance;
+
+  const timeStamps = object._scene.frameState?.timeStamps;
+  let fpsMultiplier = 1;
+  if (timeStamps?.length === 10) {
+    const elapsedTime = (timeStamps[0] - timeStamps[9]) / 9;
+    const fps = 1 / (elapsedTime / 1000);
+    // target refresh rate of 30hz
+    fpsMultiplier = 30 / fps;
+  }
+
+  let zoomRate = zoomFactor * minDistance * fpsMultiplier;
+
   zoomRate = CesiumMath.clamp(
     zoomRate,
     object._minimumZoomRate,