mandarinx/NormalsVisualizer.cs

## README.md

      
    Raw
  

              README.md
            
          
    Visualize the normals of a mesh

It's meant to be simple and easy to use, and therefore it has been made as a custom editor of MeshFilter. It needs no preparations.
How to use

Drop the file in an Editor folder.
Updates


store the normals length i editor prefs
adjust the normals length in the mesh filter inspector


## NormalsVisualizer.cs
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(MeshFilter))]
public class NormalsVisualizer : Editor {

    private const string     EDITOR_PREF_KEY = "_normals_length";
    private       Mesh       mesh;
    private       MeshFilter mf;
    private       Vector3[]  verts;
    private       Vector3[]  normals;
    private       float      normalsLength = 1f;

    private void OnEnable() {
        mf   = target as MeshFilter;
        if (mf != null) {
            mesh = mf.sharedMesh;
        }
        normalsLength = EditorPrefs.GetFloat(EDITOR_PREF_KEY);
    }

    private void OnSceneGUI() {
        if (mesh == null) {
            return;
        }

        Handles.matrix = mf.transform.localToWorldMatrix;
        Handles.color = Color.yellow;
        verts = mesh.vertices;
        normals = mesh.normals;
        int len = mesh.vertexCount;

        for (int i = 0; i < len; i++) {
            Handles.DrawLine(verts[i], verts[i] + normals[i] * normalsLength);
        }
    }

    public override void OnInspectorGUI() {
        base.OnInspectorGUI();
        EditorGUI.BeginChangeCheck();
        normalsLength = EditorGUILayout.FloatField("Normals length", normalsLength);
        if (EditorGUI.EndChangeCheck()) {
            EditorPrefs.SetFloat(EDITOR_PREF_KEY, normalsLength);
        }
    }
}
	using UnityEditor;
	using UnityEngine;

	[CustomEditor(typeof(MeshFilter))]
	public class NormalsVisualizer : Editor {

	private const string EDITOR_PREF_KEY = "_normals_length";
	private Mesh mesh;
	private MeshFilter mf;
	private Vector3[] verts;
	private Vector3[] normals;
	private float normalsLength = 1f;

	private void OnEnable() {
	mf = target as MeshFilter;
	if (mf != null) {
	mesh = mf.sharedMesh;
	}
	normalsLength = EditorPrefs.GetFloat(EDITOR_PREF_KEY);
	}

	private void OnSceneGUI() {
	if (mesh == null) {
	return;
	}

	Handles.matrix = mf.transform.localToWorldMatrix;
	Handles.color = Color.yellow;
	verts = mesh.vertices;
	normals = mesh.normals;
	int len = mesh.vertexCount;

	for (int i = 0; i < len; i++) {
	Handles.DrawLine(verts[i], verts[i] + normals[i] * normalsLength);
	}
	}

	public override void OnInspectorGUI() {
	base.OnInspectorGUI();
	EditorGUI.BeginChangeCheck();
	normalsLength = EditorGUILayout.FloatField("Normals length", normalsLength);
	if (EditorGUI.EndChangeCheck()) {
	EditorPrefs.SetFloat(EDITOR_PREF_KEY, normalsLength);
	}
	}
	}