/// <summary>
/// Computes the absolute position for all the bones in this skeleton.
/// </summary>
/// <param name="bone">The bone to start with, should always be the ROOT bone.</param>
/// <param name="world">A world matrix to use in the calculation.</param>
public void ComputeBonePositions(Bone bone, Matrix world)
{
var translateMatrix = Matrix.CreateTranslation(bone.Translation);
var rotationMatrix = Matrix.CreateFromQuaternion(bone.Rotation);
var myWorld = (rotationMatrix * translateMatrix)*world;
bone.AbsolutePosition = Vector3.Transform(Vector3.Zero, myWorld);
bone.AbsoluteMatrix = myWorld;
foreach (var child in bone.Children)
{
ComputeBonePositions(child, myWorld);
}
}
/// <summary>
/// Clones this bone.
/// </summary>
/// <returns>A Bone instance with the same values as this one.</returns>
public Bone Clone()
{
var result = new Bone
{
Unknown = this.Unknown,
Name = this.Name,
ParentName = this.ParentName,
HasProps = this.HasProps,
Properties = this.Properties,
Translation = this.Translation,
Rotation = this.Rotation,
CanTranslate = this.CanTranslate,
CanRotate = this.CanRotate,
CanBlend = this.CanBlend,
WiggleValue = this.WiggleValue,
WigglePower = this.WigglePower,
Index = this.Index
};
return result;
}
//TODO: assumes that skeleton will be same configuration for all bindings of this mesh.
//If any meshes are used by pets and avatars(???) or we implement children this will need
//to be changed to support binds to multiple SKEL bases.
/// <summary>
/// Transforms the verticies making up this mesh into
/// the designated bone positions.
/// </summary>
/// <param name="bone">The bone to start with. Should always be the ROOT bone.</param>
///
public void Prepare(Bone bone)
{
if (Prepared) return;
var binding = BoneBindings.FirstOrDefault(x => x.BoneName.Equals(bone.Name, StringComparison.InvariantCultureIgnoreCase));
if (binding != null)
{
for (var i = 0; i < binding.RealVertexCount; i++)
{
var vertexIndex = binding.FirstRealVertex + i;
VertexBuffer[vertexIndex].Parameters.X = bone.Index;
}
for (var i = 0; i < binding.BlendVertexCount; i++)
{
var blendVertexIndex = binding.FirstBlendVertex + i;
BlendVertBoneIndices[blendVertexIndex] = bone.Index;
}
}
foreach (var child in bone.Children)
{
Prepare(child);
}
if (bone.Name.Equals("ROOT", StringComparison.InvariantCultureIgnoreCase))
{
for (int i = 0; i < BlendData.Length; i++)
{
var data = BlendData[i];
var vert = BlendVertBoneIndices[i];
VertexBuffer[data.OtherVertex].Parameters.Y = BlendVertBoneIndices[i];
VertexBuffer[data.OtherVertex].Parameters.Z = data.Weight;
VertexBuffer[data.OtherVertex].BvPosition = BlendVerts[i];
}
InvalidateMesh();
Prepared = true;
}
}
/// <summary>
/// Reads a skeleton from a stream.
/// </summary>
/// <param name="stream">A Stream instance holding a skeleton.</param>
public void Read(Stream stream)
{
using (var io = IoBuffer.FromStream(stream))
{
var version = io.ReadUInt32();
Name = io.ReadPascalString();
var boneCount = io.ReadInt16();
Bones = new Bone[boneCount];
for (var i = 0; i < boneCount; i++)
{
Bone bone = ReadBone(io);
bone.Index = i;
Bones[i] = bone;
}
/** Construct tree **/
foreach (var bone in Bones)
{
bone.Children = Bones.Where(x => x.ParentName == bone.Name).ToArray();
}
RootBone = Bones.FirstOrDefault(x => x.ParentName == "NULL");
ComputeBonePositions(RootBone, Matrix.Identity);
}
}
/// <summary>
/// Reads a bone from a IOBuffer.
/// </summary>
/// <param name="reader">An IOBuffer instance used to read from a stream holding a skeleton.</param>
/// <returns>A Bone instance.</returns>
private Bone ReadBone(IoBuffer reader)
{
var bone = new Bone();
bone.Unknown = reader.ReadInt32();
bone.Name = reader.ReadPascalString();
bone.ParentName = reader.ReadPascalString();
bone.HasProps = reader.ReadByte();
if (bone.HasProps != 0)
{
var propertyCount = reader.ReadInt32();
var property = new PropertyListItem();
for (var i = 0; i < propertyCount; i++)
{
var pairCount = reader.ReadInt32();
for (var x = 0; x < pairCount; x++)
{
property.KeyPairs.Add(new KeyValuePair<string, string>(
reader.ReadPascalString(),
reader.ReadPascalString()
));
}
}
bone.Properties.Add(property);
}
var xx = -reader.ReadFloat();
bone.Translation = new Vector3(
xx,
reader.ReadFloat(),
reader.ReadFloat()
);
bone.Rotation = new Quaternion(
reader.ReadFloat(),
-reader.ReadFloat(),
-reader.ReadFloat(),
-reader.ReadFloat()
);
bone.CanTranslate = reader.ReadInt32();
bone.CanRotate = reader.ReadInt32();
bone.CanBlend = reader.ReadInt32();
bone.WiggleValue = reader.ReadFloat();
bone.WigglePower = reader.ReadFloat();
return bone;
}
