Require distinct panorama locations for rounds and captures

shared/protocol.ts

@@ -21,6 +21,13 @@ export const pointSchema = z.object({
   z: z.number().finite(),
 });
 export const faces = ["px", "nx", "py", "ny", "pz", "nz"] as const;
+export function panoramaLocationKey(point: {
+  x: number;
+  y: number;
+  z: number;
+}) {
+  return [point.x, point.y, point.z].map(Math.floor).join(",");
+}
 export const viewpointSchema = pointSchema.extend({
   id: z.string().regex(/^[a-zA-Z0-9_-]{1,64}$/),
   assetRoot: z.string().uuid().optional(),
@@ -144,6 +151,11 @@ export const datasetSchema = z
 // Media provenance is assigned by the server after the owner accepts a contribution.
 export function parseUploadManifest(value: unknown) {
   const manifest = datasetSchema.parse(value);
+  if (
+    !manifest.contributionTo &&
+    new Set(manifest.viewpoints.map(panoramaLocationKey)).size < 5
+  )
+    throw new Error("Capture at least five panoramas from different block positions");
   if (manifest.mediaFormat)
     throw new Error("Use map import for rendered archives");
   manifest.serverAddress =