How to Fix an Unreal Two-Sided Material Looking Flat on Backfaces

Two-sided geometry like leaves needs light to scatter through the surface, not just bounce off the front normal. Unreal's Two Sided Foliage shading model handles this transmission. Here is how to fix it.

How to fix it

1. Use the Two Sided Foliage model

In the material's Details panel set Shading Model to Two Sided Foliage and enable Two Sided so both faces render with proper transmission.

2. Feed a Subsurface Color

Connect a Subsurface Color (the transmitted tint, often a deeper green for leaves) so backlit faces glow rather than going black.

3. Tune normal usage

Two Sided Foliage automatically flips the normal per face for lighting, so you do not need a manual VFACE-style flip the way a custom Default Lit material would.

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 Unreal Engine 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.