public Skeleton(Stream Data)
{
m_Reader = new FileReader(Data, true);
m_Reader.ReadUInt32(); //Version
Name = m_Reader.ReadPascalString();
BoneCount = m_Reader.ReadUShort();
for(int i = 0; i < BoneCount; i++)
{
Bones.Add(new Bone(m_Reader, i));
}
/** Construct tree **/
foreach (Bone bone in Bones)
bone.Children = Bones.Where(x => x.ParentName == bone.Name).ToArray();
RootBone = Bones.FirstOrDefault(x => x.ParentName == "NULL");
m_Reader.Close();
}
/// <summary>
/// Transforms all vertices in a given mesh to their correct positions.
/// </summary>
/// <param name="Msh">The mesh to transform.</param>
/// <param name="bone">The bone to transform to.</param>
private void TransformVertices(Mesh Msh, Bone bone, MeshType MshType)
{
switch (MshType)
{
case MeshType.Head:
for (int i = 0; i < Msh.TotalVertexCount; i++)
{
//Transform the head vertices' position by the absolute transform
//for the headbone (which is always bone 17) to render the head in place.
Msh.TransformedVertices[i].Position = Vector3.Transform(Msh.RealVertices[i].Position,
Skel.Bones[16].AbsoluteMatrix);
Msh.TransformedVertices[i].TextureCoordinate = Msh.RealVertices[i].TextureCoordinate;
//Transform the head normals' position by the absolute transform
//for the headbone (which is always bone 17) to render the head in place.
Msh.TransformedVertices[i].Normal = Vector3.Transform(Msh.RealVertices[i].Normal,
Skel.Bones[16].AbsoluteMatrix);
}
return;
case MeshType.Body:
BoneBinding boneBinding = Msh.BoneBindings.FirstOrDefault(x => Msh.Bones[(int)x.BoneIndex] == bone.Name);
if (boneBinding != null)
{
for (int i = 0; i < boneBinding.RealVertexCount; i++)
{
int vertexIndex = (int)boneBinding.FirstRealVertexIndex + i;
VertexPositionNormalTexture relativeVertex = Msh.RealVertices[vertexIndex];
Matrix translatedMatrix = Matrix.CreateTranslation(new Vector3(relativeVertex.Position.X, relativeVertex.Position.Y, relativeVertex.Position.Z)) * bone.AbsoluteMatrix;
Msh.TransformedVertices[vertexIndex].Position = Vector3.Transform(Vector3.Zero, translatedMatrix);
Msh.TransformedVertices[vertexIndex].TextureCoordinate = relativeVertex.TextureCoordinate;
//Normals...
translatedMatrix = Matrix.CreateTranslation(new Vector3(relativeVertex.Normal.X, relativeVertex.Normal.Y, relativeVertex.Normal.Z)) * bone.AbsoluteMatrix;
Msh.TransformedVertices[vertexIndex].Normal = Vector3.Transform(Vector3.Zero, translatedMatrix);
}
}
foreach (var child in bone.Children)
TransformVertices(Msh, child, MshType);
break;
case MeshType.LHand:
for (int i = 0; i < Msh.TotalVertexCount; i++)
{
//Transform the left hand vertices' position by the absolute transform
//for the left handbone (which is always bone 10) to render the left hand in place.
Msh.TransformedVertices[i].Position = Vector3.Transform(Msh.RealVertices[i].Position,
Skel.Bones[9].AbsoluteMatrix);
//Transform the left hand normals' position by the absolute transform
//for the left handbone (which is always bone 10) to render the left hand in place.
Msh.TransformedVertices[i].Normal = Vector3.Transform(Msh.RealVertices[i].Normal,
Skel.Bones[9].AbsoluteMatrix);
}
return;
case MeshType.RHand:
for (int i = 0; i < Msh.TotalVertexCount; i++)
{
//Transform the right hand vertices' position by the absolute transform
//for the right handbone (which is always bone 15) to render the right hand in place.
Msh.TransformedVertices[i].Position = Vector3.Transform(Msh.RealVertices[i].Position,
Skel.Bones[14].AbsoluteMatrix);
//Transform the right hand normals' position by the absolute transform
//for the right handbone (which is always bone 15) to render the right hand in place.
Msh.TransformedVertices[i].Normal = Vector3.Transform(Msh.RealVertices[i].Normal,
Skel.Bones[14].AbsoluteMatrix);
}
return;
}
}
/// <summary>
/// Computes the absolute positions for all bones in a Skeleton.
/// </summary>
/// <param name="bone">The first bone in the skeleton.</param>
/// <param name="world">World matrix.</param>
public void ComputeBonePositions(Bone bone, Matrix world)
{
var translateMatrix = Matrix.CreateTranslation(bone.Translation);
var rotationMatrix = Helpers.FindQuaternionMatrix(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);
}
}
