What causes river water flowing straight instead of following the bends?

The water shader scrolls its UVs in a single global direction, so water appears to flow straight even where the riverbed curves.

How do I catch this when it only happens for some players?

Capture it automatically from the player's device with the full stack trace, the device and OS, the build, and a breadcrumb trail of what they did. That turns a vague complaint into a specific, reproducible issue you can fix without owning the hardware it happens on.

How to Fix Water Flow Map Direction Not Following River Bends

Quick answer: Author a flow map texture whose RG channels encode local flow direction, and distort the water UVs by that vector so the surface follows the channel.

Your river's surface ripples drift the same way everywhere, sliding sideways through bends instead of following the water's path. A flow map lets the current direction vary per location.

How to fix it

1. Author a flow map

Paint a texture where the red and green channels store the normalized flow direction (remapped to 0-1) along the river's path, including the curves and confluences.

2. Distort UVs by flow

In the shader decode the flow vector (flow = tex.rg * 2.0 - 1.0) and offset the normal/foam UVs along it over time so ripples travel downstream wherever they are.

3. Hide the reset seam

Use the standard two-phase flow-map blend (two offset samples cross-faded on a looping timer) so the periodic UV reset does not pop, keeping the flow continuous around bends.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Godot error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.

Most of the time the fix is small. Seeing the failure clearly is the part that actually costs you.