public void Update(float elapsed)
{
foreach (AnimationState state in animationStates)
{
if (!state.IsActive())
{
continue;
}
Animation animation = state.GetAnimation();
state.Update(elapsed);
float timePosition = state.GetTimePosition();
for (int i = 0; i < animation.GetTrackCount(); i++)
{
AnimationTrack track = animation.GetTrack(i);
AnimationKeyFrame keyframe = track.GetInterpolatedKeyFrame(timePosition);
int boneIndex = skeleton.GetBoneIndexByName(track.GetName());
keyframe.GetMatrix(out animationTransforms[boneIndex]);
}
}
// convert animation transforms from local to world coordinates
for (int i = 0; i < animationTransforms.Length; i++)
{
int parent = skeleton.GetParentBoneIndexByIndex(i);
if (parent == -1)
{
continue;
}
Matrix.Multiply(ref animationTransforms[i], ref animationTransforms[parent], out animationTransforms[i]);
}
// create the skinning matrix
// the skinning matrix takes world space vertices to joint space and then back
// to world space using the animation transform
for (int i = 0; i < animationTransforms.Length; i++)
{
Matrix invWorldBoneMatrix;
AnimationBone bone = skeleton.GetBoneByIndex(i);
bone.GetInvWorldTransform(out invWorldBoneMatrix);
Matrix.Multiply(ref invWorldBoneMatrix, ref animationTransforms[i], out animationTransforms[i]);
}
effect.SetBoneTransforms(animationTransforms);
effect.World = world;
}
