private List <BoneMapping> GetBoneMappings()
{
var bones = new List <BoneMapping>();
var boneNames = SceneToImport.Meshes.SelectMany(x => x.Bones).Select(x => x.Name).Distinct().ToList();
if (!boneNames.Any())
{
return(bones);
}
var boneNodes = Assimp.AssimpHelper.GetNodeHierarchy(SceneToImport.RootNode)
.Where(x => boneNames.Contains(x.Name)) /*.OrderBy(x => x.GetLevel())*/.ToList();
//include last bone if no weight
if (boneNodes.LastOrDefault()?.ChildCount > 0)
{
var lastBone = boneNodes.Last();
if (lastBone.MeshCount == 0)
{
boneNodes.Add(lastBone.Children[0]);
}
}
boneNames = boneNodes.Select(x => x.Name).ToList();//names in order
foreach (var boneNode in boneNodes)
{
//var meshBone = SceneToImport.Meshes.SelectMany(x => x.Bones).FirstOrDefault(x => x.Name == boneNode.Name);
//var pos1 = ItemTransform.FromMatrix(meshBone.OffsetMatrix.ToLDD());
string parentName = boneNode.Parent?.Name;
if (!boneNames.Contains(parentName))
{
parentName = null;
}
var boneTransform = boneNode.GetFinalTransform().ToLDD();
//var yAxis = boneTransform.TransformNormal(Simple3D.Vector3.UnitY);
//boneTransform = Simple3D.Matrix4.FromAngleAxis((float)Math.PI * -0.5f, yAxis) * boneTransform;
var mapping = new BoneMapping()
{
Name = boneNode.Name,
ParentName = parentName,
Transform = ItemTransform.FromMatrix(boneTransform),
AssimpID = boneNames.IndexOf(boneNode.Name)
};
bones.Add(mapping);
}
//Adjust bone rotation for LDD
foreach (var bone in bones)
{
var target = bones.FirstOrDefault(x => x.ParentName == bone.Name);
if (target != null)
{
var dir = (target.Transform.Position - bone.Transform.Position).Normalized();
var angle = Simple3D.Vector3d.AngleBetween(Simple3D.Vector3d.UnitX, dir);
var yAxis = Simple3D.Vector3d.Cross(Simple3D.Vector3d.UnitX, dir);
var rot = Simple3D.Matrix4d.FromAngleAxis(angle, yAxis);
bone.Transform.Rotation = Quaterniond.ToEuler(rot.ExtractRotation()) * (180d / Math.PI);
}
else if (bone.ParentName != null)
{
var parent = bones.FirstOrDefault(x => x.Name == bone.ParentName);
bone.Transform.Rotation = parent.Transform.Rotation;
}
}
return(bones);
}
