Version: 2021.1
UV overlap
Custom fall-off

Lightmap seam stitching

Seam stitching is a feature that smooths unwanted hard edges in GameObjects rendered with baked lightmaps generated by the Progressive Lightmapper.

A Scene without seam stitching
A Scene without seam stitching
A Scene with seam stitching
A Scene with seam stitching

When Unity bakes lightmaps, it identifies Mesh faces that are close together but separate from each other as being separate in lightmap space; the edges of these Meshes are called “seams”. Seams are ideally invisible, but they can sometimes appear to have hard edges depending on the light. This is because the GPU cannot blend texel values between charts that are separated in the lightmap.

Seam stitching fixes these issues. When you enable seam stitching, Unity does extra computations to amend the lightmap to improve each seam’s appearance. Stitching is not perfect, but it often improves the final result substantially. Seam stitching takes extra time during baking due to extra calculations Unity makes, so Unity disables it by default.

Limitations of seam stiching

Seam stitching works with the Progressive Lightmapper. Seam stitching only works on single GameObjects; multiple GameObjects cannot be smoothly stitched together.

Using seam stitching

You can enable seam stitching on any GameObject with a MeshRenderer component, like this:

  1. Select the GameObject
  2. In the Inspector, navigate to the MeshRenderer component’s Lightmapping section
  3. Enable Stitch Seams

  • Seam stitching added in 2017.2 NewIn20172
UV overlap
Custom fall-off