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Slow down flight + extend corridor for longer tile residency

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Camera speed was 0.45 units/sec which on 13km/tile tiles = ~5850
km/h = supersonic. User reported flying through tiles too fast.

- drift speed 0.45 -> 0.12 units/sec (~1500 km/h, fast plane)
- corridor 15 -> 25 tiles along travel (~3.5 min between refetches
  at uSpeed=1, instead of ~12 sec)
- buffer 2 -> 3 tiles (refetch starts earlier so we always have
  tiles loaded before the camera reaches the edge)
- Updated JS-side drift calculation to match the new shader speed

Camera now leisurely follows the corridor; refetch only once every
couple of minutes.
This commit is contained in:
Richard Zink committed 2026-10-07 21:11:04 +02:00
1 parent 587c8f4a19
commit 425dbf4529
1 file changed
+4 -4
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vendor/clouds3d.js
Vendored
+4 -4
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@@ -136,7 +136,7 @@ var FRAG_SRC = [
// Camera path: slow drift in X, cruising just above the cloud deck // Camera path: slow drift in X, cruising just above the cloud deck
// like an airliner cockpit. No dives — we stay above so the // like an airliner cockpit. No dives — we stay above so the
// deck is always visible below us. // deck is always visible below us.
'float drift = uTime * uSpeed * 0.45;', 'float drift = uTime * uSpeed * 0.12;',
// Fixed altitude well above the cloud ceiling (y=1.5). // Fixed altitude well above the cloud ceiling (y=1.5).
'float camY = 2.2;', 'float camY = 2.2;',
'vec3 ro = vec3(0.0, camY, drift);', 'vec3 ro = vec3(0.0, camY, drift);',
@@ -275,9 +275,9 @@ var GROUND_TILE_SIZE = 256;
// The corridor is aligned with both motion and look direction. // The corridor is aligned with both motion and look direction.
var GROUND_TRAVEL_COS = 0.0; // cos(90 deg) var GROUND_TRAVEL_COS = 0.0; // cos(90 deg)
var GROUND_TRAVEL_SIN = 1.0; // sin(90 deg) var GROUND_TRAVEL_SIN = 1.0; // sin(90 deg)
var GROUND_CORRIDOR_LONG = 15; // tiles along the travel direction var GROUND_CORRIDOR_LONG = 25; // tiles along travel direction (~3.5 min of flight at uSpeed=1)
var GROUND_CORRIDOR_PERP = 5; // tiles perpendicular to travel var GROUND_CORRIDOR_PERP = 5; // tiles perpendicular to travel
var GROUND_BUFFER_LONG = 2; // refetch when this close to forward edge var GROUND_BUFFER_LONG = 3; // refetch when this close to forward edge
var GROUND_BUFFER_PERP = 1; // refetch when this close to side edge var GROUND_BUFFER_PERP = 1; // refetch when this close to side edge
// Passau tile at zoom 11 // Passau tile at zoom 11
var GROUND_BASE_X = 1099; var GROUND_BASE_X = 1099;
@@ -522,7 +522,7 @@ window.clouds3dRender = function(target) {
gl.uniform2f(s.uGroundCenter, centerWorld.x, centerWorld.y); gl.uniform2f(s.uGroundCenter, centerWorld.x, centerWorld.y);
gl.uniform2f(s.uGroundSize, GROUND_CORRIDOR_LONG, GROUND_CORRIDOR_PERP); gl.uniform2f(s.uGroundSize, GROUND_CORRIDOR_LONG, GROUND_CORRIDOR_PERP);
var drift = now * speed * 0.45; var drift = now * speed * 0.12;
if (performance.now() - groundLastCheck > 1500) { if (performance.now() - groundLastCheck > 1500) {
groundLastCheck = performance.now(); groundLastCheck = performance.now();
maybeRefetchGround(drift, drift * 0.7, gl); maybeRefetchGround(drift, drift * 0.7, gl);