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using System.Collections.Generic;
using System.Linq;
using UnityEngine;
// using UniGLTF;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace MeshUtility
{
[DisallowMultipleComponent]
public class BindposeGizmo : MonoBehaviour
{
[SerializeField]
Mesh m_target;
[SerializeField]
float[] m_boneWeights;
[SerializeField, Range(0.1f, 1.0f)]
float m_gizmoSize = 0.02f;
[SerializeField]
Color m_meshGizmoColor = Color.yellow;
[SerializeField]
Color m_bindGizmoColor = Color.red;
private void Reset()
{
var renderer = GetComponent<SkinnedMeshRenderer>();
if (renderer == null) return;
m_target = renderer.sharedMesh;
}
#if UNITY_EDITOR
#region ToBindpose
[ContextMenu("ToBindpose")]
void ToBindpose()
{
var renderer = GetComponent<SkinnedMeshRenderer>();
var root =
renderer.bones
.Select(x => Ancestors(x).Reverse().ToArray())
.Aggregate((a, b) =>
{
int i = 0;
for (; i < a.Length && i < b.Length; ++i)
{
if (a[i] != b[i])
{
break;
}
}
return a.Take(i).ToArray();
})
.Last()
;
var map = new Dictionary<Transform, Matrix4x4>();
for (int i = 0; i < renderer.bones.Length; ++i)
{
map[renderer.bones[i]] = m_target.bindposes[i];
}
{
var bones = Traverse(root);
Undo.RecordObjects(bones.ToArray(), "toBindpose");
foreach (var x in bones)
{
var bind = default(Matrix4x4);
if (map.TryGetValue(x, out bind))
{
var toWorld = renderer.transform.localToWorldMatrix * bind.inverse;
x.position = toWorld.GetColumn(3);
x.rotation = toWorld.ExtractRotation();
}
}
//EditorUtility.SetDirty(transform);
}
}
IEnumerable<Transform> Traverse(Transform self)
{
yield return self;
foreach (Transform child in self)
{
foreach (var x in Traverse(child))
{
yield return x;
}
}
}
IEnumerable<Transform> Ancestors(Transform self)
{
yield return self;
if (self.parent != null)
{
foreach (var x in Ancestors(self.parent))
{
yield return x;
}
}
}
#endregion
#endif
private void OnDrawGizmos()
{
if (m_target == null)
{
return;
}
Gizmos.matrix = transform.localToWorldMatrix;
if (m_target.bindposes != null && m_target.bindposes.Length > 0)
{
if (m_boneWeights == null || m_boneWeights.Length != m_target.bindposes.Length)
{
m_boneWeights = new float[m_target.bindposes.Length];
foreach (var bw in m_target.boneWeights)
{
if (bw.weight0 > 0) m_boneWeights[bw.boneIndex0] += bw.weight0;
if (bw.weight1 > 0) m_boneWeights[bw.boneIndex1] += bw.weight1;
if (bw.weight2 > 0) m_boneWeights[bw.boneIndex2] += bw.weight2;
if (bw.weight3 > 0) m_boneWeights[bw.boneIndex3] += bw.weight3;
}
}
Gizmos.color = m_meshGizmoColor;
Gizmos.DrawWireMesh(m_target);
for (var i = 0; i < m_target.bindposes.Length; ++i)
{
var color = m_bindGizmoColor * m_boneWeights[i];
color.a = 1.0f;
Gizmos.color = color;
Gizmos.matrix = transform.localToWorldMatrix * m_target.bindposes[i].inverse;
Gizmos.DrawWireCube(Vector3.zero, Vector3.one * m_gizmoSize);
}
}
else
{
Gizmos.color = Color.gray;
Gizmos.DrawWireMesh(m_target);
}
}
}
}
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