/// <summary>
/// Get the bones from the model and create a bone class object for
/// each bone. We use our bone class to do the real animated bone work.
/// </summary>
private void ObtainBones()
{
bones.Clear();
foreach (ModelBone bone in model.Bones)
{
// Create the bone object and add to the heirarchy
Bone newBone = new Bone(bone.Name, bone.Transform, bone.Parent != null ? bones[bone.Parent.Index] : null);
// Add to the bones for this model
bones.Add(newBone);
}
}
/// <summary>
/// Constructor for a bone object
/// </summary>
/// <param name="name">The name of the bone</param>
/// <param name="bindTransform">The initial bind transform for the bone</param>
/// <param name="parent">A parent for this bone</param>
public Bone(string name, Matrix bindTransform, Bone parent)
{
this.Name = name;
this.parent = parent;
if (parent != null)
parent.children.Add(this);
// I am not supporting scaling in animation in this
// example, so I extract the bind scaling from the
// bind transform and save it.
this.bindScale = new Vector3(bindTransform.Right.Length(),
bindTransform.Up.Length(), bindTransform.Backward.Length());
bindTransform.Right = bindTransform.Right / bindScale.X;
bindTransform.Up = bindTransform.Up / bindScale.Y;
bindTransform.Backward = bindTransform.Backward / bindScale.Y;
this.bindTransform = bindTransform;
// Set the skinning bind transform
// That is the inverse of the absolute transform in the bind pose
ComputeAbsoluteTransform();
SkinTransform = Matrix.Invert(AbsoluteTransform);
}
/// <summary>
/// Assign this bone to the correct bone in the model
/// </summary>
/// <param name="model"></param>
public void SetModel(AnimatedModel model)
{
// Find this bone
assignedBone = model.FindBone(ClipBone.Name);
}
