diff --git a/src/rendering/world-background-renderer.ts b/src/rendering/world-background-renderer.ts
index d958599b..8875b015 100644
--- a/src/rendering/world-background-renderer.ts
+++ b/src/rendering/world-background-renderer.ts
@@ -59,6 +59,23 @@ export interface WorldEnvironmentState {
   intensity: number;
 }
 
+export function shouldUseDynamicWorldEnvironment(
+  background: WorldBackgroundSettings,
+  backgroundTexture: Texture | null,
+  overlay: WorldBackgroundOverlayState | null
+): boolean {
+  const overlayTexture = overlay?.texture ?? null;
+  const overlayOpacity = clamp(overlay?.opacity ?? 0, 0, 1);
+
+  return (
+    background.mode === "image" &&
+    backgroundTexture !== null &&
+    overlayTexture !== null &&
+    overlayOpacity > NIGHT_BACKGROUND_EPSILON &&
+    overlayOpacity < 1 - NIGHT_BACKGROUND_EPSILON
+  );
+}
+
 export function resolveWorldEnvironmentState(
   background: WorldBackgroundSettings,
   backgroundTexture: Texture | null,
@@ -243,6 +260,10 @@ export class WorldBackgroundRenderer {
     this.anchor.position.copy(camera.position);
   }
 
+  syncToOrigin() {
+    this.anchor.position.set(0, 0, 0);
+  }
+
   dispose() {
     this.geometry.dispose();
     this.gradientMaterial.dispose();