I get weird seams when I bake the light

Unity Engine
, ,
1

Hi! I’ve experimented plenty with this, but have not been able to solve it. I’ve built an environment using a modular approach. All walls etc are little “lego pieces” with non-overlapping UVs (all marked as static). When I bake I often, but not always, get seams. I’ve experimented plenty with the light settings, but I haven’t been able to remove these. In certain areas Unity just burns in a seam into the light. What should I do? These seams look ugly. Most are subtle, but some, like the first one in the attached image, are super strong. Please help :frowning:

6378414--710361--unity_bake_issue.jpg
6378414--710361--unity_bake_issue.jpg1268×1034 127 KB

2

It looks like an issue with normals to me… drop this into an Editor folder somewhere and see that they’re pointing in the right direction. You’ll need to check the “Active” toggle.

using UnityEngine;
using UnityEditor;
[CustomEditor(typeof(MeshFilter), true, isFallback = true)]
[CanEditMultipleObjects]
public class NormalsInspector : Editor
{
  Color handleColor = Color.red;
  float handleScale = 0.25f;
  float handleThickness = 2;
  public static bool active = false;
  void OnSceneGUI()
  {
    if (!active) return;
    if (target.GetType() == typeof(MeshFilter))
    {
      MeshFilter meshFilter = (MeshFilter)target;
      Mesh mesh = meshFilter.sharedMesh;
      if (mesh == null) return;

      Handles.color = handleColor;
      Vector3[] normals = mesh.normals;
      if (normals != null)
      {
        Vector3[] vertices = mesh.vertices;
        for (int v = 0; v < normals.Length; v++)
        {
          Vector3 position = meshFilter.gameObject.transform.TransformPoint(vertices[v]);
          Handles.DrawLine(position, position + (meshFilter.gameObject.transform.TransformDirection(normals[v].normalized) * HandleUtility.GetHandleSize(position) * handleScale), handleThickness);
        }
      }
    }
  }
  public override void OnInspectorGUI()
  {
    base.OnInspectorGUI();
    EditorGUILayout.BeginHorizontal();
    active = GUILayout.Toggle(active, "View Normals");
    handleColor = EditorGUILayout.ColorField(handleColor);
    if (GUI.changed) SceneView.RepaintAll();
    EditorGUILayout.EndHorizontal();
  }
}

6378504--710400--view_normals.jpg

3

Hi! Thanks for your reply. I couldn’t get your script to work (got errors), but I threw the assets into Maya and displayed the normals instead (attachment below). The .obj-files look clean and well to me, so as long as Unity doesn’t interpret these in a weird manner all should be fine. The image features the generic floor and the generic wall I use.
6378576--710418--normals.png

EDIT: Btw, I could mention that these seams are only seen when the light is baked. I think a normal problem might’ve been visible even without baked light (when all is realtime). But these problems only show up if I choose to go with the baked light.

4

Okay - no idea then, I don’t know much about lightmaps / light probes / intricacies of baking and so on… yet anyway. I can’t even get a nice spotlight working without either washing things out with intensity or setting crazy range on it (trying to avoid that given limit on number of objects per light thing), so hopefully someone more capable has a clue what’s going on here :smile:

5

Haha, thanks for your help anyway! :slight_smile:

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