Rain particle volume has a hard visible boundary when viewed from inside a building.

Consistent with the boundary of the camera-attached rain emitter volume, or of the under-cover rain suppression region, being cut hard rather than faded. Visibility depends almost entirely on background contrast — it's invisible against trees or town background and obvious against overcast sky and open water.

It was first noticed in a custom building with large, intact glass panels. That is likely why the issue is rarely seen: almost all vanilla windows are broken or empty, so players seldom get a clean, uninterrupted view of distant rain from indoors. The same artifact is present in vanilla buildings — it is just harder to spot through smaller openings against cluttered backgrounds.

A straight-edged region with noticeably reduced or absent rain is visible in the middle distance. The edges are hard, not faded.

Diagnostic observations

• The boundary is camera-locked — it tracks with the player when strafing rather than staying fixed to the window or the world.

• Its apparent height changes with distance from the window.

• Its edges are aligned with the rain's fall direction, so they appear diagonal in wind.

• It is not visible when standing outdoors in the open, only from inside looking out.

• Reproduced in an unmodded building and modded building.

Steps to reproduce

1. Wait for heavy rain (fully overcast, strong precipitation).

2. Stand inside any enclosed building with a window facing open terrain — ideally the sea or a distant hillside, so the background is low-contrast.

3. Look out through the window.

4. Strafe left and right, then walk toward and away from the window.

Rain appears uniform across the visible scene.