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using System;
using UnityEngine;
using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
using Unity.DemoTeam.Attributes;
namespace Unity.DemoTeam.DigitalHuman
{
[ExecuteAlways]
public class SkinAttachment : MeshInstanceBehaviour
{
public enum AttachmentMode
{
BuildPoses,
LinkPosesByReference,
LinkPosesBySpecificIndex,
}
public enum AttachmentType
{
Transform,
Mesh,
MeshRoots,
}
[HideInInspector] public bool attached;
[HideInInspector] public Vector3 attachedLocalPosition;
[HideInInspector] public Quaternion attachedLocalRotation;
[HideInInspector]
public SkinAttachmentTarget targetActive;
[EditableIf("attached", false)]
public SkinAttachmentTarget target;
[EditableIf("attached", false)]
public AttachmentType attachmentType = AttachmentType.Transform;
[EditableIf("attached", false)]
public AttachmentMode attachmentMode = AttachmentMode.BuildPoses;
[EditableIf("attached", false)]
public SkinAttachment attachmentLink = null;
[EditableIf("attachmentMode", AttachmentMode.LinkPosesBySpecificIndex)]
public int attachmentIndex = -1;
[EditableIf("attachmentMode", AttachmentMode.LinkPosesBySpecificIndex)]
public int attachmentCount = 0;
[HideInInspector]
public ulong checksum0 = 0;
[HideInInspector]
public ulong checksum1 = 0;
[Header("Debug options")]
public bool showBounds = false;
public bool showIslands = false;
public bool showRootLines = false;
private const int debugColorsSize = 7;
private static Color[] debugColors = new Color[debugColorsSize] { Color.red, Color.green, Color.blue, Color.cyan, Color.magenta, Color.yellow, Color.white };
private static SkinAttachmentData debugData;
[Header("Runtime options")]
public bool forceRecalculateBounds;
public bool forceRecalculateNormals;
public bool forceRecalculateTangents;
[NonSerialized] public float meshAssetRadius;
[NonSerialized] public MeshBuffers meshBuffers;
[NonSerialized] public MeshAdjacency meshAdjacency;
[NonSerialized] public MeshIslands meshIslands;
[NonSerialized] public Transform skinningBone;
[NonSerialized] public Matrix4x4 skinningBoneBindPose;
[NonSerialized] public Matrix4x4 skinningBoneBindPoseInverse;
public Matrix4x4 GetWorldToLocalSkinning()
{
if (skinningBone != null)
return (skinningBoneBindPoseInverse * skinningBone.worldToLocalMatrix);
else
return (this.transform.worldToLocalMatrix);
}
public Matrix4x4 GetLocalSkinningToWorld()
{
if (skinningBone != null)
return (skinningBone.localToWorldMatrix * skinningBoneBindPose);
else
return (this.transform.localToWorldMatrix);
}
void DiscoverSkinningBone()
{
skinningBone = null;
skinningBoneBindPose = Matrix4x4.identity;
skinningBoneBindPoseInverse = Matrix4x4.identity;
// search for skinning bone
var smr = GetComponent<SkinnedMeshRenderer>();
if (smr != null)
{
int skinningBoneIndex = -1;
unsafe
{
var boneWeights = meshAsset.GetAllBoneWeights();
var boneWeightPtr = (BoneWeight1*)boneWeights.GetUnsafeReadOnlyPtr();
for (int i = 0; i != boneWeights.Length; i++)
{
if (boneWeightPtr[i].weight > 0.0f)
{
if (skinningBoneIndex == -1)
skinningBoneIndex = boneWeightPtr[i].boneIndex;
if (skinningBoneIndex != boneWeightPtr[i].boneIndex)
{
skinningBoneIndex = -1;
break;
}
}
}
}
if (skinningBoneIndex != -1)
{
skinningBone = smr.bones[skinningBoneIndex];
skinningBoneBindPose = meshInstance.bindposes[skinningBoneIndex];
skinningBoneBindPoseInverse = skinningBoneBindPose.inverse;
//Debug.Log("discovered skinning bone for " + this.name + " : " + skinningBone.name);
}
}
}
protected override void OnMeshInstanceCreated()
{
meshAssetRadius = meshAsset.bounds.extents.magnitude;// conservative
if (meshBuffers == null)
meshBuffers = new MeshBuffers(meshInstance);
else
meshBuffers.LoadFrom(meshInstance);
if (meshAdjacency == null)
meshAdjacency = new MeshAdjacency(meshBuffers);
else
meshAdjacency.LoadFrom(meshBuffers);
if (meshIslands == null)
meshIslands = new MeshIslands(meshAdjacency);
else
meshIslands.LoadFrom(meshAdjacency);
DiscoverSkinningBone();
}
protected override void OnMeshInstanceDeleted()
{
// do nothing
}
public Hash128 Checksum()
{
return new Hash128(checksum0, checksum1);
}
public bool ChecksumCompare(in SkinAttachmentData data)
{
return (checksum0 == data.checksum0) && (checksum1 == data.checksum1);
}
public void RevertVertexData()
{
if (meshAsset != null)
{
if (meshBuffers == null)
meshBuffers = new MeshBuffers(meshAsset);
else
meshBuffers.LoadFrom(meshAsset);
}
}
public void Attach(bool storePositionRotation = true)
{
EnsureMeshInstance();
if (targetActive != null)
targetActive.RemoveSubject(this);
targetActive = target;
targetActive.AddSubject(this);
if (storePositionRotation)
{
attachedLocalPosition = transform.localPosition;
attachedLocalRotation = transform.localRotation;
}
attached = true;
}
public void Detach(bool revertPositionRotation = true)
{
RemoveMeshInstance();
if (targetActive != null)
targetActive.RemoveSubject(this);
if (revertPositionRotation)
{
transform.localPosition = attachedLocalPosition;
transform.localRotation = attachedLocalRotation;
}
attached = false;
}
void ValidateAttachedState()
{
if (attached)
{
if (targetActive != null && targetActive == target)
{
EnsureMeshInstance();
}
else
{
Detach();
}
}
else
{
RemoveMeshInstance();
}
}
void OnEnable()
{
ValidateAttachedState();
}
void Update()
{
ValidateAttachedState();
}
void LateUpdate()
{
var forceRecalculateAny = forceRecalculateBounds || forceRecalculateNormals || forceRecalculateTangents;
if (forceRecalculateAny && meshInstance != null)
{
if (forceRecalculateTangents)
meshInstance.SilentlyRecalculateTangents();
if (forceRecalculateNormals)
meshInstance.SilentlyRecalculateNormals();
if (forceRecalculateBounds)
meshInstance.SilentlyRecalculateBounds();
}
}
void OnDestroy()
{
RemoveMeshInstance();
}
#if UNITY_EDITOR
void OnDrawGizmosSelected()
{
if (isActiveAndEnabled == false)
return;
if (attached)
DrawGizmosAttached();
else
DrawGizmosDetached();
}
void DrawGizmosAttached()
{
if (attachmentType != AttachmentType.Transform)
{
if (meshInstance == null)
return;
Gizmos.matrix = this.transform.localToWorldMatrix;
if (showBounds)
{
Gizmos.color = Color.white;
Gizmos.DrawWireCube(meshInstance.bounds.center, meshInstance.bounds.extents * 2.0f);
}
}
}
void DrawGizmosDetached()
{
if (target == null)
return;
var targetMeshInfo = target.GetCachedMeshInfo();
if (targetMeshInfo.valid == false)
return;
if (attachmentType == AttachmentType.Transform)
{
// draw sphere with radius to closest vertex
var closestDist = float.MaxValue;
var closestNode = -1;
var targetLocalPos = target.transform.InverseTransformPoint(this.transform.position);
if (targetMeshInfo.meshVertexBSP.FindNearest(ref closestDist, ref closestNode, ref targetLocalPos))
{
Gizmos.matrix = target.transform.localToWorldMatrix;
var r = targetLocalPos - target.meshBuffers.vertexPositions[closestNode];
var d = Vector3.Dot(target.meshBuffers.vertexNormals[closestNode], r);
var c = (d >= 0.0f) ? Color.cyan : Color.magenta;
Gizmos.color = Color.Lerp(Color.clear, c, 0.75f);
Gizmos.DrawSphere(targetLocalPos, Mathf.Sqrt(closestDist));
Gizmos.color = Color.Lerp(Color.clear, c, 0.75f);
Gizmos.DrawLine(targetLocalPos, target.meshBuffers.vertexPositions[closestNode]);
foreach (var triangle in targetMeshInfo.meshAdjacency.vertexTriangles[closestNode])
{
int _0 = triangle * 3;
int v0 = target.meshBuffers.triangles[_0];
int v1 = target.meshBuffers.triangles[_0 + 1];
int v2 = target.meshBuffers.triangles[_0 + 2];
Gizmos.DrawLine(target.meshBuffers.vertexPositions[v0], target.meshBuffers.vertexPositions[v1]);
Gizmos.DrawLine(target.meshBuffers.vertexPositions[v1], target.meshBuffers.vertexPositions[v2]);
Gizmos.DrawLine(target.meshBuffers.vertexPositions[v2], target.meshBuffers.vertexPositions[v0]);
}
}
}
else
{
EnsureMeshInstance();
if (meshInstance == null)
return;
var subjectPositions = meshBuffers.vertexPositions;
if (skinningBone != null)
Gizmos.matrix = skinningBone.localToWorldMatrix * skinningBoneBindPose;
else
Gizmos.matrix = this.transform.localToWorldMatrix;
if (showIslands)
{
for (int island = 0; island != meshIslands.islandCount; island++)
{
Gizmos.color = Color.Lerp(Color.clear, debugColors[island % debugColors.Length], 0.3f);
foreach (var i in meshIslands.islandVertices[island])
{
foreach (var j in meshAdjacency.vertexVertices[i])
{
Gizmos.DrawLine(subjectPositions[i], subjectPositions[j]);
}
}
}
}
if (showRootLines)
{
if (debugData == null)
{
debugData = SkinAttachmentData.CreateInstance<SkinAttachmentData>();
debugData.hideFlags = HideFlags.HideAndDontSave;
}
else
{
debugData.Clear();
}
int dryRunPoseCount = -1;
int dryRunItemCount = -1;
SkinAttachmentDataBuilder.BuildDataAttachSubject(ref debugData, target.transform, target.GetCachedMeshInfo(), this, dryRun: true, ref dryRunPoseCount, ref dryRunItemCount);
{
ArrayUtils.ResizeCheckedIfLessThan(ref debugData.pose, dryRunPoseCount);
ArrayUtils.ResizeCheckedIfLessThan(ref debugData.item, dryRunItemCount);
}
SkinAttachmentDataBuilder.BuildDataAttachSubject(ref debugData, target.transform, target.GetCachedMeshInfo(), this, dryRun: false, ref dryRunPoseCount, ref dryRunItemCount);
Matrix4x4 targetToWorld = Matrix4x4.TRS(target.transform.position, target.transform.rotation, Vector3.one);
// NOTE: targetToWorld specifically excludes scale, since source data (BakeMesh) is already scaled
Matrix4x4 targetToSubject;
{
if (skinningBone != null)
targetToSubject = (skinningBoneBindPoseInverse * skinningBone.worldToLocalMatrix) * targetToWorld;
else
targetToSubject = this.transform.worldToLocalMatrix * targetToWorld;
}
Gizmos.color = Color.white;
for (int i = 0; i != meshBuffers.vertexCount; i++)
{
Vector3 rootOffset = targetToSubject.MultiplyVector(-debugData.item[i].targetOffset);
Gizmos.DrawRay(subjectPositions[i], rootOffset);
}
}
}
}
#endif
}
}