release: bump version to 0.37.0

frontend/public/earth/js/utils.js

@@ -4,6 +4,10 @@ import * as THREE from "three";
 
 import { CONFIG } from "./constants.js";
 
+function clamp(value, min, max) {
+  return Math.min(max, Math.max(min, value));
+}
+
 // Convert latitude/longitude to 3D vector
 export function latLonToVector3(lat, lon, radius = CONFIG.earthRadius) {
   const phi = (90 - lat) * (Math.PI / 180);
@@ -90,3 +94,31 @@ export function calculateDistance(
 
   return radius * c;
 }
+
+export function getSurfaceMarkerCameraScale(camera, options = {}) {
+  if (!camera) return 1;
+
+  const {
+    altitudeOffset = 0,
+    referenceFov = 75,
+    min = 0.12,
+    max = 3.0,
+  } = options;
+
+  const cameraDistanceFromCenter = camera.position.length();
+  const surfaceDistance = Math.max(
+    1,
+    cameraDistanceFromCenter - (CONFIG.earthRadius + altitudeOffset),
+  );
+  const referenceSurfaceDistance = Math.max(
+    1,
+    CONFIG.defaultCameraZ - (CONFIG.earthRadius + altitudeOffset),
+  );
+  const cameraFovRad = (((camera.fov || referenceFov)) * Math.PI) / 180;
+  const referenceFovRad = (referenceFov * Math.PI) / 180;
+  const worldPerPixel = surfaceDistance * Math.tan(cameraFovRad / 2);
+  const referenceWorldPerPixel =
+    referenceSurfaceDistance * Math.tan(referenceFovRad / 2);
+
+  return clamp(worldPerPixel / referenceWorldPerPixel, min, max);
+}