Why does my Texture 2D Array sample look pinched at edges?

The Sample Texture 2D Array node uses the texture's wrap mode. If the asset is set to Clamp, UVs outside [0,1] sample the edge, producing a stretched look. Set Wrap Mode to Repeat in the texture importer.

How do I tile within the array?

Use frac(uv) before the sample node to wrap UVs into [0,1] regardless of input. Or set Wrap Mode = Repeat. frac in the graph is more explicit and works with clamped textures.

What about the Slice index?

Sample Texture 2D Array takes a Slice integer in addition to UV. Pass the layer you want (0..count-1). Out-of-range slice samples the closest valid slice silently.

Fix: Unity Shader Graph Sample Texture 2D Array UV Clamped

Quick answer: Set the Texture 2D Array’s Wrap Mode to Repeat in its importer. Or use a Fraction node on the UV before the sample to wrap explicitly. Pass the right Slice index for the layer you want.

Terrain shader uses a Texture 2D Array for layers. UV tiles past 1.0 stretch out across the edge. Wrap Mode is set to Clamp on the asset.

The Symptom

Sample Texture 2D Array shows the texture clamped at edges instead of repeating. Or returns wrong layer when the slice index goes out of range.

The Fix

Wrap Mode on the asset. Select the Texture2DArray asset. Inspector → Wrap Mode → Repeat. Apply.

Or frac() in the graph.

UV (Tiling) -> Fraction -> Sample Texture 2D Array.UV
Slice -> Sample Texture 2D Array.Index

Fraction wraps UVs into [0,1] regardless of input. Robust against clamped textures.

Slice index. Pass an int between 0 and (array length - 1). Use a Custom Function or a Property to feed the slice from script.

Per-Vertex Slice

For terrain, encode slice index in a vertex color channel. Sample once per fragment using the interpolated slice. With a few slices and barycentric blending, you get smooth per-tile blends.

Verifying

Apply the shader to a quad. Tile UV by 4 (UV * 4). With Repeat or Fraction, the texture tiles 4x. With Clamp and no Fraction, the texture stretches once.

“Repeat the texture, or frac the UV. Right slice index. Tiles render.”

Related Issues

For Shader Graph Time frozen, see Time node. For SRP Batcher, see SRP Batcher.

Repeat or fraction. Right slice. Tile.